Toxicity of insecticide-bait mixtures to insecticide resistant and susceptible western corn rootworms (Coleoptera: Chrysomelidae)

Authors

Srinivas Parimi, University of Nebraska-Lincoln
Lance J. Meinke, University of Nebraska-LincolnFollow
Timothy M. Nowatzki, University of Nebraska-Lincoln
Laurence D. Chandler, USDA-ARSFollow
B. Wade French, Northern Grain Insects Research Laboratory, USDA-ARSFollow
Blair D. Siegfried, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

5-14-2003

Comments

Published in Crop Protection 22 (2003) 781–786.

Abstract

Organophosphate resistant and susceptible populations of the western corn rootworm, Diabrotica virgifera virgifera LeConte. were subjected to adult feeding bioassays with different combinations of insecticide and a cucurbitacin bait. Five technical grade insecticides (methyl-parathion, carbaryl, fipronil, bifenthrin and indoxacarb) were used in combination with Invite EC^TM as the feeding stimulant. Differences in susceptibility to the insecticide/bait combinations were observed among the resistant and susceptible populations for methyl-parathion and carbaryl. Susceptibility to fipronil, bifenthrin and indoxacarb was similar among the resistant and susceptible populations. Assays in which response to the insecticide/bait combination was compared with the bait alone indicated that methyl-parathion and bifenthrin were deterrent when compared to other treatments. These results suggest that the efficacy of Invite as a feeding stimulant in combination with certain insecticides may be compromised by previously identified resistance and by insecticides that antagonize the feeding stimulation of the cucurbitacin bait.