| Autor: |
Tiwari, Grace, Kaur, Navneet, Anderson, Nicole P, Tanner, K Christy, Lightle, Danielle M, Willette, Alison R, Otani, Jennifer K, Jorgensen, Amanda M, Yoder, Calvin, Dorman, Seth J |
| Zdroj: |
Journal of Economic Entomology; April 2024, Vol. 117 Issue: 2 p609-617, 9p |
| Abstrakt: |
The clover seed weevil, Tychius picirostrisFabricius, a serious pest of white clover, Trifolium repensL., grown for seed in western Oregon, causing feeding damage to flowers and developing seeds. Since 2017, white clover seed producers have anecdotally reported T. picirostriscontrol failures using foliar pyrethroid insecticide applications. This mode of action (MoA) is an important chemical control option for T. picirostrismanagement. To evaluate insecticide resistance selection to pyrethroids (bifenthrin) and other MoAs labeled for T. picirostrismanagement (malathion and chlorantraniliprole), adult populations were collected from 8 commercial white clover grown for seed fields in the Willamette Valley, OR, in 2022 and 2023. Among collected Oregon populations, very high resistance ratios (RR50= 178.00–725.67) were observed to technical grade bifenthrin and low to high resistance ratios (RR50= 7.80–32.80) to malathion in surface contact assays compared to a susceptible Canadian field population. Moreover, >2.73 times the labeled rate of formulated product containing bifenthrin as the sole MoA was required to kill >50% of T. picirostrisin topical assays. Synergistic assays with a mixed-function oxidase inhibitor, an esterase inhibitor, and a glutathione-S-transferase inhibitor revealed phase I and II detoxification enzymes are present in Oregon T. picirostrispopulations and confer metabolic resistance to bifenthrin. This is the first report of T. picirostrisinsecticide resistance selection to pyrethroid and organophosphate insecticides. Results will inform continued monitoring and insecticide resistance management strategies to slow the evolution of T. picirostrisinsecticide resistance selection in Oregon’s white clover seed production. |
| Databáze: |
Supplemental Index |
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