Journal
JOURNAL OF ECONOMIC ENTOMOLOGY
Volume 114, Issue 2, Pages 891-902Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/jee/toaa305
Keywords
Lygus pratensis; pyrethroid resistance selection; risk assessment; baseline susceptibility; resisitance monitoring
Categories
Funding
- Natural Science Foundation of China [31560519]
- Chinese Postdoctoral Fund [155582]
- China Scholarship Council [201708150008]
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The plant bug Lygus pratensis Linnaeus is a significant insect pest of alfalfa in northern China, exhibiting high resistance risk to lambda-cyhalothrin and medium resistance to other insecticides. A 5-year field investigation showed an increasing trend in resistance levels to lambda-cyhalothrin and imidacloprid in certain populations of L. pratensis.
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 (h(2)) 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/cm(2) 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.
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