Synergism Between Demethylation Inhibitor Fungicides or Gibberellin Inhibitor Plant Growth Regulators and Bifenthrin in a Pyrethroid-Resistant Population of Listronotus maculicollis (Coleoptera: Curculionidae)

In 2007-2008, the "annual bluegrass weevil," Listronotus maculicollis Kirby (Coleoptera: Curculionidae), a serious pest of Poa annua L. (Poales: Poaceae) on U.S. golf courses, was shown to be resistant to two pyrethroids, bifenthrin and lambda-cyhalothrin. In 2008, we showed that bifenthri...

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Bibliographic Details
Published in:Journal of economic entomology 2010-10, Vol.103 (5), p.1810-1814
Main Authors: RAMOUTAR, D, COWLES, R. S, REQUINTINA, E, ALM, S. R
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Coleoptera - drug effects
Coleoptera - genetics
Control
Drug Resistance
Fundamental and applied biological sciences. Psychology
Fungicides, Industrial - toxicity
Generalities
Gibberellins - antagonists & inhibitors
Insecta
Invertebrates
New England
Phytopathology. Animal pests. Plant and forest protection
Plant Growth Regulators - toxicity
Poaceae - parasitology
Protozoa. Invertebrates
Pyrethrins - toxicity
Seasons
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Summary:In 2007-2008, the "annual bluegrass weevil," Listronotus maculicollis Kirby (Coleoptera: Curculionidae), a serious pest of Poa annua L. (Poales: Poaceae) on U.S. golf courses, was shown to be resistant to two pyrethroids, bifenthrin and lambda-cyhalothrin. In 2008, we showed that bifenthrin resistance was principally mediated by oxidase detoxification (cytochrome P450 [P450]). P450s can be inhibited by demethylation inhibitor fungicides and gibberellin inhibitor plant growth regulators, both of which are commonly used on golf courses. We tested these compounds for synergistic activity with bifenthin against a pyrethroid-resistant population of L. maculicollis. The LD50 value for bifenthrin was significantly reduced from 87 ng per insect (without synergists) to 9.6-40 ng per insect after exposure to the fungicides fenarimol, fenpropimorph, prochloraz, propiconazole, and pyrifenox and the plant growth regulators flurprimidol, paclobutrazol, and trinexapac-ethyl. Simulated field exposure with formulated products registered for use on turf revealed enhanced mortality when adult weevils were exposed to bifenthrin (25% mortality, presented alone) combined with field dosages of propiconizole, fenarimol, flurprimidol, or trinexapac-ethyl (range, 49-70% mortality).
ISSN:0022-0493
1938-291X
0022-0493
DOI:10.1603/EC09374