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

• Published in: Crop protection 2003, Vol.22 (5), p.781-786
• Main Authors: Parimi, Srinivas, Meinke, Lance J., Nowatzki, Timothy M., Chandler, Laurence D., Wade French, B., Siegfried, Blair D.
• Format: Article
• Language: English
• Subjects: at-risk population; bifenthrin; Carbaryl; corn; Diabrotica virgifera virgifera; fipronil; indoxacarb; Insecticide baits; insecticide resistance; Invite EC; Methyl-parathion; parathion-methyl; Resistance; rootworms; toxicity; Western corn rootworm
• ISSN: 0261-2194; 1873-6904
• DOI: 10.1016/S0261-2194(03)00047-4

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™ 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.