Olfactory response of larval diamondback moth (Lepidoptera: Plutellidae) to permethrin formulations
1993
Lin, H.C. | Hoy, C.W. | Head, G.
Odor-mediated behavioral response to permethrin formulations was investigated for two populations (Celeryville, OH, and Geneva, NY) of the diamondback moth, Plutella xylostella (L.). In three-choice olfactory assays, odors from formulations containing 1% or more Ambush or Ambush Blank were significantly avoided by third instars from both populations. The repellent effect was not significant when the concentrations were 0.1% or less. However, 0.01% Ambush Blank was significantly attractive for both populations. Two-choice olfactory assays confirmed the repellent effects of Ambush and Ambush Blank and also showed that 1% Pounce wettable powder formulation was significantly repellent. Technical permethrin did not significantly affect the distribution of larvae from either population. Analyses of how quickly larvae left the arena in the two-choice assays revealed that the permethrin formulations were affecting the speed of larval movement. Larvae moving away from Ambush and, in the case of Celeryville, Ambush Blank, were significantly slower to leave the arena than larvae in corresponding controls. On the other hand, Celeryville larvae that moved toward Pounce wettable powder and larvae from either population that moved toward technical permethrin odors left the test arena significantly more quickly than larvae in corresponding controls. This study indicates that odors from both the active and inert components of permethrin formulations affect larval behavior in ways that could increase the probability of survival in a treated area. Furthermore, contact with deposits is not necessary to elicit these behavioral changes.
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