Differential susceptibility of parasitized and nonparasitized larvae of Trichoplusia ni to a nuclear polyhedrosis virus |
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Authors: | C C Beegle E R Oatman |
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Institution: | 1. Division of Biological Control, University of California Citrus Research Center Riverside, California 92502 USA;2. Agricultural Experiment Station, Riverside, California 92502 USA |
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Abstract: | Nonparasitized second-instar larvae of Trichoplusia ni were twice as susceptible (at the LD50 level) to the singly enveloped T. ni nuclear polyhedrosis virus as those parasitized by Hyposoter exiguae (Hymenoptera: Ichneumonidae). The LD50 values for nonparasitized and parasitized larvae were 1.58 × 103 and 3.16 × 103 polyhedra/ml of diet, respectively. The LD95 value for parasitized larvae was approximateely 5 times higher than that for nonparasitized larvae. The slopes (b values) were 1.2 for parasitized larvae and 1.7 for nonparasitized larvae. The LT50 values for parasitized larvae also were significantly longer than those for nonparasitized larvae. No significant difference was found between the food consumption of parasitized and nonparasitized T. ni larvae. |
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