Abstract
Benomyl incorporated into artificial diet and fed to nonparasitized and parasitized third-instar orange tortrix, Argyrotaenia citrana (Fernald), was nontoxic to hosts at 300 ppm, but toxic via the host to the solitary endoparasite Apanteles aristoteliae Vierek. This same concentration fed to hosts after parasitization rid hosts of parasites and significantly increased percentage of parasitized host larvae pupating as compared with control larvae. This chemotherapeutic effect was similar for hosts fed benomyl-laced diet for 24 h after parasitization versus those fed benomyl continuously. Increasing concentrations of benomyl from 150 to 1,200 ppm caused increasing percentages of parasitized hosts blocked in larval development for ≤120 d. Increased levels of blocked hosts were associated with increased levels of larvae dissected from hosts that did not pupate or produce parasites after 30 d of larval development. Percentage adult parasite emergence was reduced by all fungicide treatments. Potential uses of benomyl or like substances to study parasite/host relationships and how benomyl may impact on field populations of these insects are discussed.
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