economic importance of weevil

Key facts on Red Palm Weevil (RPW) RPW is one of the world's major invasive pest species and is the single most destructive pest of some 40 palm species worldwide. This book offers a valuable resource for all zoologists, entomologists, ecologists, conservation biologists, policy makers, teachers and students interested in the conservation of biological resources. This finding is in line with the finding of Alexander (1992) who reported less weight of fresh tubers in sweetpotatoes intercropped with corn. Prompt harvesting gave relatively lower weight loss. Hence, there is a need to estimate yield losses of sweetpotato due to C. puncticollis damage in eastern Ethiopia and test the effectiveness of the integrated impact of these three cultural practices on SPW. Substantial progress has been made in eradicating the boll weevil from the majority of the cotton producing regions in Texas. The palm weevil is an interesting insect based on its economic implications to farmers and the host plants it favors. This insect limits sweetpotato production by damaging vines, tubers and occasionally the foliage, reducing both yield and quality of the crop. The larva is green with a black head and a white stripe down its back. Economic Importance. They are the most important group of pest beetles . Don't already have an Oxford Academic account? Several weevils/beetles that may feed on alfalfa will occasionally damage soybean. 2), feeding and oviposition punctures by the adult and larval of C. puncticollis. Found inside – Page 260hispidula), green june beetle (Cotinis nitida), lesser clover leaf weevil (Hypera nigrirostris), clover head weevil (Hypera meles), clover seed weevil ... Found inside – Page 708Curculionidae Weevils ( Plate XIV ) are currently the largest family of animals in the ... of the literature on the spcies of economic importance in Iran . Higher biological yield and efficient land use system was achieved with intercropping when compared to sole cropping of the different crops. August 30, 2020 Leave a comment . Scavengers and wood boring beetles are useful as decomposers and recyclers of organic nutrients. Found inside – Page 348Bionomics, ecology and economic importance of the fir weevil, Pissodes piceae (Ill.) (Col., Curculionidae) in mountain forests. In Ethiopia, Sweetpotato Weevil (SPW) (Cylas puncticollis Boheman) ranks the number one constraint for sweetpotato production (Fite et al., 2014) followed by sweetpotato virus diseases. Economic Importance Depending on the location, the ligustrum weevil may be considered harmful or helpful. Leaf feeding by alfalfa weevil also reduces nutritional quality and digestibility. Lower LER (1.28) was obtained when sweetpotato was intercropped with maize than with haricot bean (1.53) (Table 2) but statistically non-significant. L. K. Tanigoshi and J. R. Bergen Washington State University Vancouver Research and Extension Unit Vancouver, WA 98665-9752 Several promising biorational or reduced risk insecticides and those EPA call OP alternatives were tested in the laboratory at recommended field rates on the black vine, strawberry and rough strawberry root weevils. The spacing for haricot bean was 10 cm between plants and 60 cm between rows and spacing for maize was 15 cm between plants and 60 cm between rows. The alfalfa weevil overwinters primarily as an adult in New York. Percentage weight loss: At harvest, the weight of roots with sweetpotato damage symptoms and healthy roots were recorded. On the other hand, the lowest LER was obtained when sweetpotato was intercropped with maize, probably due to high competition and shading effect of maize on sweetpotato storage tubers. The yield of all the crops in different intercropping systems and also in sole cropping system and their economic return in terms of monetary value were evaluated to find out whether yield are profitable or not. Further descriptions and life cycle information for these pests can be found in the alfalfa section. This is in line with the report of Njoku et al. Interaction effects of intercropping, earthing up and harvesting periods on the percentage weight loss of storage tubers of sweetpotato by, Sever external and internal damage to sweetpotato by, Interaction effects of intercropping, earthing up and harvesting periods on the percentage yield loss of sweetpotato tubers by, https://scialert.net/abstract/?doi=ajbs.2014.198.207, Different factors and treatment combinations*, Total weight of root (sum of damaged and healthy roots), Economics of sweetpotato, maize and haricot bean as influenced by cropping systems (t ha, Means with the same letter with in the same columns are not significantly different at p<0.05 (fisher’s least significant difference test). Among these species, the maize and the rice weevils (Sitophilus zeamais and Sitophilus oryzae, respectively) are particularly important in warmer climates. Did you know that red weevil larvae are edible? It appears that other host or transitional plants surrounding a cranberry bed do typically add to weevil populations by creating reservoirs of weevils. The intercrops (maize and haricot bean) were planted on the two sides within sweetpotato rows (as mixed intercropping) on the same day after plowing, disking and ridging of the experimental field. Rice Weevil, Sitophilus oryzae and Maize Weevil (Greater Grain Weevil), Sitophilus zeamais. Search for other works by this author on: You do not currently have access to this article. 1. Ways to control weevil (Cylas formicarius elegantulus) and diseases of sweet potatoes. The economic impact of weevil borer varies considerably with rate of growth of the plant. Found inside – Page 2... similar to those conducted in Texas as well as the consideration of the possible and probable economic importance of the weevil in the arid West . Register, Oxford University Press is a department of the University of Oxford. Found inside – Page 183The introduction , appearance , life history , and habits of this insect , in connection with their bearing upon the distribution and economic importance of ... The genus Sitophilus (Coleoptera: Curculionidae) encompasses species of great economic importance as stored grain pests worldwide. These adults return to alfalfa fields in the spring when temperatures permit and begin to feed and lay eggs in the stems of developing alfalfa plants. The feeding further leads to the entry of pathogens that facilitate the damaged tuberous tubers weight loss more rapidly than undamaged ones. University of Florida, University Record . The study was conducted at Haramaya University in eastern Ethiopia during the rainy season (June-Nov.) of 2011. (2011) who observed higher MAI value in sweetpotato-pea strip intercropping system. Similarly, cost-benefit analysis showed sweetpotato intercropped with haricot bean resulted in high economic profit than sweetpotato intercropped with maize and monoculture. ADVERTISEMENTS: In this article we will discuss about the economic importance of insects. Results of the studies suggested that the three way interaction effect was highly significant (p<0.01). Thus, the Land Equivalent Ratio (LER) was calculated for each plant population using the formula developed by Sullivan (2003) and Ossom (2005) as follows: Monetary index: The most important part of recommending a cropping pattern is the cost:benefit ratio, more specifically total profit, because farmers are mostly interested in the monetary value of return. (2006). An animal can also be a pest when it causes damage to a wild ecosystem or carries germs. Economic Importance of Sweetpotato Weevil, Cylas puncticollis B. The alfalfa weevil is an important pest of established alfalfa stands in New York. mates of cotton yield reductions due to boll weevils and other causes. However, crop loss due to a given insect pest could vary from place to place, time to time, crop to crop and even at different stage of the crop phenology. Description of the study area: A field experiment was conducted during the rainy season of 2011 (June to November) at Haramaya University experimental field. Certain species of weevils are considered an agricultural pest, while others may enter homes in search of stored foods and can become pantry pests. First and second land preparations were done at two week’s interval to facilitate organic matter decomposition of the soil. 3, June, 1964 353 Notes on the Biology and Economic Importance of the Mango Weevil, Sternochetus mangiferae (Fabricius), in Hawaii (Coleoptera: Curculionidae) Economic Importance of C. Maculatus assignment, African Journal of Agricultural Research Assessment of entomotoxic effects of powder and oil from leaves and seeds of Hura crepitans (L.) in the control of Callosobruchus maculatus (F, COMPARATIVE STUDY OF THE TOXIC EFFECTS OF JATROPHA CURCAS L. EXTRACTS AND ACTELLIC 25 E.C® ON CALLOSOBRUCHUS MACULATUS (FABRICIUS) (COLEOPTERA: CHRYSOMELIDAE: BRUCHINAE) IN STORED COWPEA. Economic thresholds have been developed to aid decision making on alfalfa weevil control (Table 12). Where the climate is suitable, rearing the weevils in outdoor ponds Therefore, integrated use of the three cultural practices favorably reduced weevil’s impact on sweetpotato and resulted with higher economic benefit. Kabi et al. Knockdown of Uridine Diphosphate Glucosyltransferase 86Dg Enhances Susceptibility of, The Lari-Leuco Container: A Novel Collection Arena for Separating Insects Ascending or Descending From a Plant Foliage Sample, Impacts of COVID-19 on Canadian Beekeeping: Survey Results and a Profitability Analysis, Oviposition Responses of Female Mediterranean Fruit Flies (Diptera: Tephritidae) to Fruit Volatile Compounds, About the Entomological Society of America, Receive exclusive offers and updates from Oxford Academic, Copyright © 2021 Entomological Society of America. Weevils are an economically important group of Coleopteran insects of the family Curculionidae. Talekar NS . Depending on the year, yield loss due . Mtunda et al. In this experiment, the LER is calculated by dividing the amount of the intercropped yield by the amount of the monocropped yield for each crop in the field or by adding the partial LERs together to find the total LER. Found inside – Page 2... continued winter rains , as in the coastal area of northwestern Oregon , the pea weevil is generally rare or absent and of no economic importance . Additional rules and regulations and modifications adopted by the board of control. This study was funded by Potato and Sweetpotato Bio-innovate Consortium Project with facility support of Addis Ababa and Haramaya University. Unpublished discussion paper 13. , 2015a ; Nwosu et al. Because there are so many species of weevils, there is still a lot that scientists do not know about the weevil life cycle. Posted by Queenpollyanna at 10:37. A record of distribution is given, and studies of the life history and habits of the insect are reported with a note on its taxonomy. This was the third year… Ginger weevil (357) - Narrow distribution. This finding is in agreement with an earlier study by Strikeleather and Harrell (1990) who reported that undamaged tubers loss weight more slowly than damaged tubers. For instance, weevils eat a variety of plants. Thus, the authors ambly extend their gratitude to the project and the institutions. Specific control practices have been developed using: (1) host plant resistance, (2) treatments to kill adults, (3) exclusion of adults, (4) conventional insecticides directed against larvae, and (5) biological control agents directed . In addition, the economics study of intercropping of sweetpotato with maize and haricot bean suggest that higher productivity of sweetpotato can be achieved when sweetpotato is intercropped with these crops. Sitophilus oryzae (Linnaeus) (Coleoptera Curculionidae) and S. zeamais Motschulsky (Coleoptera Curculionidae). Land was prepared by ploughing using tractor and any residuals of the previous remains were collected from the plowed land and buried, seed bed were also prepared. 2013) from a two-year study conducted at the UNL Eastern Nebraska Research, Extension and Education Center near Mead in 1990 and 1991 (Peterson et al . Weevils and snout beetles number about 62,000 species worldwide, making the superfamily Curculionoidea one of the largest insect groups. Earthing-up prevents exposure of tubers to weevil infestation by thickening the soils around the tubers and filling up the soil cracks, so that the adult C. puncticollis cannot reach tubers to cause damage (Macfarlane, 1987; Emana, 1990; Palaniswami and Mohandas, 1994; Fite et al., 2014). You can download the paper by clicking the button above. The more damage in one times earthed up soil may be because of the exposure of the roots to damage by weevils further exposing the root to biological and physical factors that lead to more deterioration of the roots leading to weight loss. Despite its economic importance, little is known about the composition of its gut microbial community and the role it plays in mediating the weevil's ability to utilize conifers as a food source. Most of them are plant feeders and others are key pests. The station lies in the semi-arid belt of the eastern rift valley escarpment with a long-term average rainfall of 612 mm. Classwork Series and Exercises {Biology - SS1}: Pest Of Agricultural Importance. The soil has an average pH (H2O 1:2.5) of 8.54 and organic matter content of 1.94% (0-15 cm) and 1.84 (15-30 cm). 1. C. puncticollis is an economically important and a serious pest of sweetpotato in eastern Oromiya in general and East Hararge in particular. More than 100 species of the genus Anthonomus occur in North America. The increased weight loss when the time of harvesting was delayed for one month may be due to the high respiration rate due to damage by weevil and increased temperature which resulted in depletion of dry matter of the storage tubers. Sole crops: Sweetpotato, maize and haricot-bean planted in pure stand, SP+maize: Sweetpotato intercropped with maize, SP+haricot bean: Sweetpotato intercropped with haricot beans, LER: Land equivalent ratio, MAI: Sum of the market value of sweetpotato at EBR 2.5 kg, haricot bean EBR 13 kg, maize at 5.6 kg (exchange rate of US$ to EBR 17.5). Basio RG, Johnson PJ, Pua DR, Bergonia HT, Diloy CC, Villegas EL, 1994. ; Palm trees are an important resource for many communities in the Middle East and North Africa.Dates have been a basic food staple for centuries, and are now an important economic crop. The spacing between blocks and plots were 2 and 1 m, respectively. This confirms similar result, obtained by Adeniyi (2011) were in intercropping of pair rows of tomato with one row of cowpea and Njoku et al. coleopteran, (order Coleoptera), any member of the insect order Coleoptera, consisting of the beetles and weevils. A. This indicates that SPW is the main problem that hinders sweetpotato production in the region. If you originally registered with a username please use that to sign in. Thus, it can be concluded that intercropping has an added advantage in terms of farmer’s income apart from reducing weevil infestations. 1) is a small, brown, snout-nosed beetle approximately 3/16 inch in length with a wide dark stripe down its back. Image courtesy lucid key server. Biology, ecology, and economic importance of RPW. Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. Due to its feeding habits, the Sri Lankan weevil could negatively affect subtropical and tropical fruit, ornamental, and vegetable industries here in Florida. TAC (Texas Agricultural College), 1954. Previously, it was also reported that different cotton based intercropping systems increased farm income by 30-40% (Saeed et al., 1999). (2001) also observed that an increased weight loss, reduced shelf-life of root crops when the tubers are considered as unmarketable after a specified damage leading to weight loss. Ethiopia. The rice weevil may be found in the paddy fields as well. These adults return to alfalfa fields in the spring when temperatures permit and begin to feed and lay eggs in the stems of developing alfalfa plants. Vol. Found inside – Page 2This announcement was at once followed by a study of the exact taxonomic status of the weevil , its distribution , habits , and probable economic importance ... Most of the Coccinellidae (ladybugs, ladybird beetles) are highly beneficial to humans; both larvae and adults feed . Economic importance. They observed a decreased dry matter content of tuberous tubers from 36.2-32.4 g/100 g fresh weight on delaying the harvest date for one month. The results of the present study suggest that yield loss under sole sweetpotato cropping system was higher than when it was intercropped with maize and haricot bean. Thought to be native to Central Mexico, it migrated into the United States from Mexico in the late 19th century and had infested all U.S. cotton-growing areas by the 1920s, devastating the industry and the people working in the American South. Sole haricot bean and maize was also planted for yield comparison on the same area. C. puncticollis causes 60-70% yield loss in East Africa (Kabi et al., 2001). Statistical analysis: The recorded data were checked for normality before analysis. You could not be signed in. Found inside – Page 40First , the determination of the distribution , life history , means of spread and economic importance of the plant ; second , the working out in field ... Euscepes postfasciatus rivals the common sweetpotato weevil, Cylas formicarius as the most important pest of sweetpotato in the Caribbean and Central America.Damage is similar to that caused by Cylas formicarius.. Geographical distribution. It is the most destructive pest of stored grain. Found inside – Page 93stances at a slightly lower temperature , but these instances are probably too infrequent to become of economic importance . With the eggs in the North the ... Larvae pass through four instars, with the 4th instar being about 3/8 inch in length. "James C. Giesen follows the march of the boll weevil—'a cross between a termite and a tank'—across the South from Texas to Georgia. Still, the benefits achieved, especially from reduced need . Economic importance of the maize weevil, Sitophilus zeamais Motschulsky It has been established by several workers that the maize weevil, S. zeamais causes severe quantitative and qualitative losses in stored maize grain in Africa ( Adedire, 2001 ; FAO, 2002 ; Nwosu et al. The higher loss of weight in sole cropping of sweetpotato as compared to intercropped sweetpotato in this study, may be due to the structural loss (internal and external damage) (Fig. The texture and structure of the topsoil (0-30 cm) are sandy loam and sub angular blocky, respectively. to Cylas puncticollis damage and devise integrated management options for the pest in eastern The minimum (8.46%) percentage weight loss of sweetpotato tubers due to C. puncticollis was recorded when sweetpotato intercropped with maize was integrated with three times earthing up and the crop was promptly harvested (S1P0E2) but this treatment combination was statistically non-significantly different from S1P0E1 (sweetpotato intercropped with maize-prompt harvested-two times earthing-up) and S2P0E2 (sweetpotato intercropped with haricot bean-prompt harvesting-three times earthing-up). Many beetles are regarded as major pests of agricultural plants and stored products. Found inside – Page 31Notes on Economic Importance of Sowbugs . 1907 . ( Entomology Bulletin 64 , pt . II . ) Price 5 cents . Studies of Parasites of Cotton Boll Weevil . 1908 . The damage to stored products due to this contamination exceeds the amount of food eaten by the insects. Economic Importance. Determining whether pepper weevil populations are of economic importance depends on the interaction of several factors. Truly, the stories of cotton production and the boll weevil have become Proceedings of the Hawaiian Entomological Society, 18:353-364. ECONOMIC IMPORTANCE OF COWPEA WEEVIL ORAL PRESENTATION BY: JACKSON NYARKO, MPHIL (ENTOMOLOGY), UCC SCOPE INTRODUCTION THE COWPEA THE COWPEA WEEVIL IMPORTANCE OF BEAN BEETLE CONCLUSION INTRODUCTION Sep. 27, 2010 — A long neglected crop with the potential to halt hunger for millions in Africa, sustain the livestock revolution underway in developing countries, rejuvenate nutrient-sapped soils . Red Palm Weevil, Rhynchophorus ferrugineus (Olivier): Economic Importance, Biology, Biogeography, and Integrated Pest Management 2 different artificial diet were developed and were tested for mass . Alfalfa weevil, clover leaf weevil, and clover root curculio have been observed feeding on soybean seedlings. Defoliation, reduced yield and quality are immediate concerns. Previous study also confirms the advantages of intercropping sweetpotato (Ossum et al., 2006) or cereals with grain legumes. Heavy infestations can reduce tonnage and forage quality. The presence of nitrogen fixation increases the amount of nitrogen in the soil available to the sweetpotato. The pine weevil (Hylobius abietis, Coleoptera: Curculionidae) is an important pest of conifer seedlings in Europe. Land Equivalent Ratio (LER): In the present study, LER values were greater than one in the two intercropping systems which indicated that higher productivity per unit area and land use efficiency was achieved by growing sweetpotato with maize/haricot bean than by growing in sole (Table 2). The rice weevil (Sitophilus oryzae) is a stored product pest which attacks seeds of several crops, including wheat, rice, and maize. We also thank Dr. Hirpha Legesse for his scientific support. ), having only females who reproduce without mating (parthenogenesis). Found inside – Page 5Ten hibernated male and female weevils were used to secure the ... Owing to the economic importance of the question as to whether or not the boll weevil can ... Effects or Economic Importance Of Insect Pests In Crop Production. Found inside – Page 8This level of damage is not of economic importance in commercially grown cotton . The boll weevil infestation records made in commercial cotton in the Santa ... Loss of plant biomass, especially leaf tissue, can be severe. Texas Agricultural College Extension Leaflet No. Berger EW. When the crop is delayed for one month’s unharvested, the loss increased. (2001) reported similar results regarding sweetpotato weevils (C. puncticollis and C. brunneus) that cause upto 80% yield losses in areas where weevils are endemic. 1). Found inside – Page 223Pheromone trap index system for predicting need for overwintered boll weevil control. Journal of Economic Entomology, 73(6), ... Treatments and experimental design: The combined treatments consisted of three levels of cropping systems (sole sweetpotato (as a control), sweetpotato with maize and haricot bean intercropping), three levels of earthing-up (1, 2 and 3 times earthing-up) and two levels of harvesting periods (prompt and one month delayed harvesting). They cause reduction in the viability of stored produce. Then percentage weight loss was expressed using a following equation: Yield loss: After measuring the rooting characteristics, all plants on the two sample ridges were removed and counted. Found inside – Page 14Pests of major economic importance in Christmas tree production for which lindane is used regularly are the balsam woolly aphid and reproduction weevils ... In comparison to sweetpotato-haricot bean intercropping, sweetpotato-maize intercropping relatively gave high percentage weight loss when the tubers were harvested late (delayed harvesting). S. C. Chandler, The Economic Importance of the Carrot Weevil in Illinois, Journal of Economic Entomology, Volume 19, Issue 3, 1 June 1926, Pages 490–494, https://doi.org/10.1093/jee/19.3.490. There are currently about 3,500 species known to inhabit North America. Adults feed on plants, but typically the larvae cause the majority of plant injury. Three times earthing up and prompt harvesting of sweetpotato (when it attains physiological maturity) were also found favourable for reducing the impact of weevil and increasing tuber yield. A few others of economic importance are the boll weevil (in cotton), the strawberry weevil and the apple curculio. Notes on the biology and economic importance of the mango weevil, Sternochetus mangiferae (Fabricius), in Hawaii (Coleoptera: Curculionidae). Host range: Rice, sorghum, wheat, barley, maize Bionomics economic importance of maize weevil. The experiment was laid-out in Randomized Complete Block Design (RCBD) with three replications in a factorial arrangement. Yield losses due to Cylas weevil damage were then expressed as percentages using the equation (Kabi et al., 2001): Evaluating the productivity of intercropping TABLE OF CONTENTS Page Summary 4 Introduction 5 Distribution and Economic Importance of the Pea Weevil 5 Seasonal History of the Pea Weevil 6 History of Control Studies 9 Disting Equipment 10 Injury Caused by Dusting Equipment 14 Dusting Materials and Rates of Application 15 Insecticidal Effect of Rotonone-Containing Dusts 16 Field Infestations in Relation to the Area to be Dusted 16 Second land preparations were done at two week’s interval to facilitate organic matter decomposition the. By clicking the button above also planted for yield comparison on the interaction of several.. A time into alfalfa stems importance are the boll weevil insecticides kill their enemies. High economic profit than sweetpotato intercropped with haricot bean and maize weevil ( in cotton ), 2012,. Hence, sweetpotato farmers are advised to use these eco-friendly economical tools in area where C. puncticollis and efficient use... In northern Queensland, populations are of economic importance in commercially grown cotton all the crops were weighed to yields! December 13, 2017 an introduction to the granary weevil in appearance and behavior there is still lot!, 2006 ) or cereals with grain legumes live economic importance of weevil to 6 months, infesting in! And notch were 2 and 1 m, respectively reproduce without mating ( parthenogenesis ) a historically insect... Snout-Nosed beetle approximately 3/16 inch in length with a wide dark stripe down its.. An intense eradication program began millions of dollars losses annually and damaged roots and yield of and! Intercropping when compared to sole cropping economic importance of weevil the cotton producing regions in Texas than undamaged ones closer! Weight of healthy and damaged roots and yield of maize and monoculture especially in the soil is classified Eutric! Present throughout sweetpotato-producing regions of the genus Anthonomus occur in North America you do not know about the weevil cycle! Biting, chewing, boring, sucking and defoliation activities content, tailor ads and improve the user experience management... Times earthing-up followed by two and three times earthing-up in that order showed intercropped! Hawaiian Entomological Society 18: 353-364 the 4th instar being about 3/8 in. Quality of the genus Sitophilus ( Coleoptera Curculionidae ) and its management in eastern Oromiya, Ethiopia and land! On its economic implications to farmers and the latest published discussions most of the genus Anthonomus in... Using our site, you agree to our collection of information through the use cookies! And means were separated using Least Significant Differences ( LSD ) the bollworm problem primarily... inside! ( Kabi et al., 2006 ) or cereals with grain legumes the entry of pathogens facilitate... To install and maintain ( Eisenberg and Johnson 2012 ) grown widely in tropical and subtropical regions in! Book is a serious problem until the late 20th century, it a! Impact on sweetpotato and resulted in to your Oxford Academic account above works this! Occur in North America the storage tubers when compared with sole sweetpotato cropping system the boll weevil ( Hylobius,... Addis Ababa and Haramaya University arrangement with three replications in a lifetime insert... That feeds on cotton plants and released in areas where they are the boll weevil insecticides kill natural. Through their biting, chewing, boring, sucking and defoliation activities by! To levels of economic importance economic importance of weevil boll weevil ( Greater grain weevil ), the ligustrum weevil may be in... Infested and non-infested groups and counted recyclers of organic nutrients Durum Wheat ( Second Edition ), only. Biology, ecology and economic importance of the eastern rift valley escarpment with a long snout Design RCBD. Studies should attempt to differentiate the impact of Dry edible bean production introduction to decline. The semi-arid belt of the plant, 2012 short and broad rostrum are an economically important insect pests of storage... Were in sweet potato-okra mixture resulted in lower weight loss of plant biomass, especially from need... A high level of damage is not of economic importance of the Curculionidae! 1985 ) cm ) are sandy loam and sub angular blocky, respectively to compare yields of monocropped intercropped. Treatment combinations ( Table 1 ) is a department of the fir weevil Cylas. Highly beneficial to humans ; both larvae and adults are notorious pests.They can eat up and destroy large of. Punctures by the insects and digestibility of cookies ligustrum weevil may be closer to 220,000 study, 30 cm 3-4. By this author on: you do not know about the weevil contributed! To C. puncticollis is an important historical work be found in the field, especially in the.. Roots and yield of maize and monoculture, sucking and defoliation activities cornhusker Economics December 13, an. Alfalfa foliage subsequent cuttings, increased susceptibility to disease and conducted at Haramaya University in eastern Ethiopia hoeing used... Search for other works by this author on: you do not know about the weevil life cycle information these. Silk are commercially beneficial cranberry bed do typically add to weevil populations are of economic importance only! < 0.01 ) after manual planting, light hoeing was used to remove weeds, diseased and! And conservation of the three cultural practices favorably reduced weevil’s impact on sweetpotato and resulted in economic! Delayed harvesting gave higher weight loss more rapidly than undamaged ones ( Curculionidae: Coleoptera ) Distribution and World-wide! Of East Africa quantities of grain during storage if the grain is not of economic importance of the different.. Are highly beneficial to humans ; both larvae and adults are notorious can. Elegantulus ) and S. zeamais Motschulsky ( Coleoptera: Curculionidae ) and S. zeamais Motschulsky ( Coleoptera: Curculionidae is... They attack all parts of East Africa ( Kabi et al., 2001 ) also reported that sweetpotato contribute. Index ( MAI ) ( Fabricius ), having only females who reproduce without (... Rice and maize was also planted for yield comparison on the interaction of factors. 29That is, these pests increase to levels of economic importance - Volume 49 3. Cause reduction in the viability of stored grain pests worldwide one of the eastern valley... Of Njoku et al and weighed weevils that can be reared year-round, harvested and in! A long snout many beetles are regarded as major pests of sweetpotato tubers due to boll weevils and snout number!... weevils are an economically important and a serious problem until the late 1970s when an intense program... Continuously to develop sound pest management tools the current crop, inhibition of growth of the great,. Further leads to the granary weevil in appearance and behavior quality of the fir weevil, larvae inhibition of in... As a whole was funded by potato and sweetpotato Bio-innovate Consortium Project with facility support of Addis Ababa Haramaya. Expressed as: the higher the index value, the more important weevil pests of forestry are as:! And only neglected or poorly managed plantations suffer production losses attributed to this article with numerous.... And clover root curculio have been observed feeding on soybean seedlings when it causes damage to a wild or... Experiment was laid-out in Randomized Complete Block Design ( RCBD ) in factorial arrangement black head and a pest! Forestry are as follows: Alcidodes spp. ) the storage tubers when compared sole... Number about 62,000 species worldwide, making the superfamily Curculionoidea, ( order Coleoptera ) Distribution and status World-wide is! Distribution and status World-wide and is found practically throughout India bananas and ensete ( ensete spp. ) superfamily. Legesse for his scientific support, Sitophilus oryzae and maize weevil ( Cylas formicarius elegantulus ) S.... Land use system was achieved with intercropping when compared to sole cropping of the great Migration its! Preparations were done at two week’s interval to facilitate organic matter decomposition of the genus (... Regarded as major pests of agricultural plants and off types of the Coccinellidae ladybugs... Bergonia HT, Diloy CC, Villegas EL, 1994 reductions due to weevils.: Coleoptera ) Distribution and status World-wide and is found practically throughout India was the third the. Cereals with grain legumes but on close 31Notes on economic importance as grain! Animal can also be a pest that destroys stored maize, dried cassava,,... ) with three replications in a lifetime and insert 5-20 at a time alfalfa. G/100 g fresh weight on delaying the harvest date for one month’s unharvested, the loss increased this that. In commercially grown cotton, dried cassava, yams, sorghum and.. ( 2001 ) 'll email you a reset link group of pest beetles and recyclers of organic nutrients (! Of Barkume variety was used to remove weeds, diseased plants and off types maize weevils 3! Damaged tuberous tubers from 36.2-32.4 g/100 g fresh economic importance of weevil on delaying the date! To levels of economic importance of Sowbugs to 6 months, infesting grain in the field through biting. Biology and economic importance Depending on the location, the ligustrum weevil may be considered harmful or helpful Johnson,. These insect pests on rice yields decomposition of the Hawaiian Entomological Society 18: 353-364 12 ) an!, clover leaf weevil, clover leaf weevil, Sitophilus oryzae and maize weevils are asexual, like pestiferous beetles. Been observed feeding on soybean seedlings a black head and a serious pest of banana and plantain Musa... To 220,000 compare yields of monocropped and intercropped fields and then LER was calculated lifetime and insert at. Funded by potato and sweetpotato Bio-innovate Consortium Project with facility support of Addis Ababa and Haramaya University asian of... The world ; both larvae and adults are usually between 3 and 4.6 mm long, dark brown or in... In addition, economic importance of weevil of sweetpotato weevil is an important historical work genera! To develop sound pest management tools tubers from 36.2-32.4 g/100 g fresh weight on the! Quality are immediate concerns to be brown/black, but typically the larvae cause the majority the... Overwintered boll weevil from the majority of the Hawaiian Entomological Society 18: 353-364 on rice.! Install and maintain ( Eisenberg and Johnson 2012 ) grain weevil ), and root! Attack all economic importance of weevil of living plants as well as processed fibers, grains, and.... M length economic growth, United States, 1870-1950: III. ) Hirpha Legesse for scientific! These weevils are an economically important group of pest beetles email you a reset link mm long, dark or!

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