Laboratory Selection, Cross-Resistance, Risk Assessment to Lambda-Cyhalothrin Resistance, and Monitoring of Insecticide Resistance for Plant Bug Lygus pratensis (Hemiptera: Miridae) in Farming-Pastoral Ecotones of Northern China

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Tan, Y., Ma, Y., Jiaa, B., Homem, R. A., Williamson, M. S., Gao, S-J., Han, H-B., Xiang, K-F., Sun, X-T., Gao, X. and Pang, B-P. 2021. Laboratory Selection, Cross-Resistance, Risk Assessment to Lambda-Cyhalothrin Resistance, and Monitoring of Insecticide Resistance for Plant Bug Lygus pratensis (Hemiptera: Miridae) in Farming-Pastoral Ecotones of Northern China. Journal of Economic Entomology. 114 (2), pp. 891-902. https://doi.org/10.1093/jee/toaa305

AuthorsTan, Y., Ma, Y., Jiaa, B., Homem, R. A., Williamson, M. S., Gao, S-J., Han, H-B., Xiang, K-F., Sun, X-T., Gao, X. and Pang, B-P.
Abstract

The plant bug Lygus pratensis Linnaeus (Hemiptera: Miridae) is an important insect pest of alfalfa in grassland farming in northern China. A field population of L. pratensis was selected in the laboratory for 14 consecutive generations with lambda-cyhalothrin to generate 42.555-fold resistance. Selection also induced low cross-resistance to imidacloprid and beta-cypermethrin, and medium cross-resistance to deltamethrin. Realized heritability (h2) of lambda-cyhalothrin resistance was 0.339. Susceptible baselines of L. pratensis were established for five insecticides using the glass-vial method, the values of which were 6.849, 3.423, 8.778, 3.559, and 117.553 ng/cm2 for phoxim, methomyl, imidacloprid, lambda-cyhalothrin, and avermectin, respectively, along with the calculated LC99 diagnostic doses. This resistance risk assessment study suggests that a high risk of lambda-cyhalothrin resistance exists in the field. In addition, a 5-year field investigation of resistance monitoring of L. pratensis was conducted in seven alfalfa regions in farming-pastoral ecotones in northern China. The resistance levels of most populations were very low for phoxim, methomyl, and avermectin, with an upward trend for lambda-cyhalothrin resistance in the DK (Dengkou County), TKT (Tuoketuo County), XL (Xilinhot), and LX (Linxi County) populations during 2015–2019, and medium resistance level to imidacloprid in the TKT population in five years we sampled. The study provided information on chemical control, lambda-cyhalothrin resistance development, baseline susceptibility, and the status of resistance to five commonly-used insecticides against L. pratensis. These results could be used to optimize pyrethroid insecticide use as part of a pest integrated resistance management strategy against this key insect pest of alfalfa.

KeywordsLygus pratensis; Pyrethroid resistance selection; Rrisk assessment; Baseline susceptibility; Resisitance monitoring
Year of Publication2021
JournalJournal of Economic Entomology
Journal citation114 (2), pp. 891-902
Digital Object Identifier (DOI)https://doi.org/10.1093/jee/toaa305
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Output statusPublished
Publication dates
Online27 Jan 2021
Publication process dates
Accepted01 Dec 2020
PublisherOxford Univ Press Inc
ISSN0022-0493

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