Shifts in Ratios of Laboratory Populations of Heliothis zea1 and H. virescens1 Surviving Exposure to a Nonspecific and Specific Nucleopolybedrosis Virus

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Abstract
Larvae of Heliothis virescens (F.) were ca. 1.2× more susceptible to the single-embedded (SEV) nucleopolyhedrosis virus (NPY) of Heliothis than were larvae of Heliothis zea (Boddie). Larvae of H. virescens were also ca. 5× more susceptible to the multiple-embedded (MEV) NPY of Autographa californica (Speyer) than were larvae of H. zea . The ratio of pupae surviving from larvae of H. virescens and H. zea exposed to MEV at one inclusion body/mm 2 changed from 1:1 ( H. virescens : H. zea ) to 1:8, 1:8 to 1:27, 1:24 to 1:366 for the 1st, 2nd, and 3rd serial exposure, respectively. In contrast, the changes in ratio of pupal survivors exposed to SEV was less than 3× after the 3rd serial exposure, with an average change of ca. 1.5×/exposure.