Abstract
The responses of thrips to commonly used insecticides were studied in onion fields with the aim of detecting presence or absence of thrips resistance to insecticides in the Central Rift Valley of Ethiopia. Thrips populations were collected from area with heavy pesticide use history Meki and Melkassa and less use areas of Werer and Minjar. Collected adult thrips populations were exposed to various concentrations of λ -cyhalothrin, dimethoate, profenofos, diazinon and spinetoram treated vial and thrips mortality was assessed after 24 h. The percent mortality was significantly lower in Meki and Melkassa collected thrips populations than in Minjar and Werer populations to λ –cyhalothrin and diazinon at recommended field rate. On the other hand, differences were insignificant for the insecticides spinetoram and profenofos at recommended field rate. Of the five tested insecticides λ –cyhalothrin had higher resistance ratios to Meki (10.8-fold) and Melkassa (6.78- fold) collected thrips population, while resistance ratio was intermediate to diazinon and lowest to dimethoate and profenofos insecticides. Results of this study suggest that thrips affecting onion in Meki and Melkassa areas have developed resistance to λ –cyhalothrin and diazinon insecticides. Periodic assessment of efficacy of registered insecticides and deploying a pesticides resistance management strategy are useful for sustainable use of pesticides in integrated thrips management program.
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Acknowledgments
The Ethiopian Ministry of Education is highly acknowledged for offering us with financial assistance to undertake our study. We acknowledge Melkassa Agricultural Research Center, Ethiopia, for providing all the required facilities for laboratory. Our special thanks go to technical staffs of the Melkassa Agricultural Research Center, Department of Entomology for their unreserved technical support during the study.
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Negash, B., Azerefegne, F. & Ayalew, G. Regional variation in susceptibility of thrips (Thysanoptera: Thripidae) to insecticides on onion in the Rift Valley of Ethiopia. Int J Trop Insect Sci 41, 1579–1584 (2021). https://doi.org/10.1007/s42690-020-00358-7
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DOI: https://doi.org/10.1007/s42690-020-00358-7