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Effects of feeding stimulant and insecticide mixtures on feeding response and morality of adult male corn earworm, Helicoverpa zea (Boddie)(Lepidoptera:Noctuidae)
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Four laboratory bioassays, including 1) proboscis extension and 2) gustatory response, 3) lethal concentration, and 4) mean lethal time to mortality, were used to investigate the effects of seventeen insecticides mixed with two sugar feeding stimulants on feeding behavior and mortality of pheromone trap captured adult male corn earworms, Helicoverpa zea (Boddie), to screen and evaluate toxicants for use in an attracticide formulation. Commercially-available formulations of acephate, boric acid, carbaryl, chlorpyrifos, cyfluthrin, cypermethrin, DDVP, dimethoate, endosulfan, imidacloprid, lambda-cyhalothrin, malathion, methomyl, oxamyl, profenofos, sulprofos, and thiodicarb, mixed with two concentrations of sucrose and fi-uctose feeding stimulants at toxicant concentrations up to 10,000 ppm AI (I%) (wt:vol), were evaluated for proboscis extension response. Data from this bioassay indicate that none of these insecticides inhibited proboscis extension below 100 ppm Al concentrations. The same test mixtures were evaluated for gustatory response. Response inhibition varied between toxicants, but most insecticides elicited no significant inhibition of gustatory response at toxicant concentrations causing mortality, Acephate, carbaryl, lambda-cyhalothrin, malathion, methomyl, profenofos, and thiodicarb mixed with 2.5 M sucrose were evaluated for toxicity to adult male corn earworms via ingestion. Twenty-four hr LCggs are ranked as follows: thiodicarb 2.0ppm Al) < methomyl (2.5) < lambda-cyhalothrin (4.4) < profenofos (8.4) < acephate (12.3)< malathion (58.2) < carbaryl (73.0). Mean lethal times to mortality were estimated for the LCgg concentration and are ranked as follows: lambda-cyhalothrin (59 niin) < profenofos (258) < carbaryl (260) < methomyl (378) < acephate and thiodicarb (540) < malathion (780). All toxicants caused mortality in less than 3 hrs at the 5X LCgg concentration and less than 2 hrs for IOX the LCgg concentration. The results of these bioassays identify the potential of using feeding stimulants mixed with insecticides at reduced concentrations for control of adult H. zea
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Includes bibliographical references: p. 105-109.
Issued also on microfiche from Lange Micrographics.
Clemens, Christopher Glen (1996). Effects of feeding stimulant and insecticide mixtures on feeding response and morality of adult male corn earworm, Helicoverpa zea (Boddie)(Lepidoptera:Noctuidae). Master's thesis, Texas A&M University. Available electronically from
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