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dc.creatorClemens, Christopher Glen
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to, referencing the URI of the item.en
dc.descriptionIncludes bibliographical references: p. 105-109.en
dc.descriptionIssued also on microfiche from Lange Micrographics.en
dc.description.abstractFour 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. zeaen
dc.publisherTexas A&M University
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en
dc.subjectMajor entomology.en
dc.titleEffects of feeding stimulant and insecticide mixtures on feeding response and morality of adult male corn earworm, Helicoverpa zea (Boddie)(Lepidoptera:Noctuidae)en
dc.format.digitalOriginreformatted digitalen

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