Susceptibility of Heliothis virescens (F.) (Lepidoptera: Noctuidae) Larvae To Microbial Agent-Chemical Pesticide Mixtures on Cotton Foliage 1
- 1 October 1983
- journal article
- research article
- Published by Oxford University Press (OUP) in Environmental Entomology
- Vol. 12 (5), 1403-1405
- https://doi.org/10.1093/ee/12.5.1403
Abstract
Bacillus thuringiensis var. kurstaki Berliner and Heliothis nuclear polyhedrosis virus (NPV) formulations Dipel and Elcar, respectively, were tested in spray mixtures with several chemical pesticides: benomyl, chlorothalonil, fentin hydroxide, and thiabendazole (fungicides); methoprene and diflubenzuron (insect growth regulators); cyhexatin (acaricide); and chlordimeform (insecticide-acaricide) on cotton foliage. Foliage from treated plants was fed to first- and third-stage Heliothis virescens (F.) larvae. First-stage larval mortality response from microbial agent-chemical pesticide mixtures varied from synergistic to antagonistic. B. thuringiensis with either acaricide, chlordimeform or cyhexatin, and Heliothis NPV-chlordimeform produced the highest mortality above the expected levels. Mixtures of either microbial agent with chlorothalonil and diflubenzuron-B. thuringiensis resulted in significantly less mortality than the expected levels. No synergism was observed when third-stage larvae were exposed to the mixtures. B. thuringiensis-fentin hydroxide or diflubenzuron and Heliothis NPV-fentin hydroxide mixtures were antagonistic. B. thuringiensis -chlorothalonil was also antagonistic when mortality was recorded at pupation.This publication has 3 references indexed in Scilit:
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