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Abstract ▼ AI-Helper

Functional and numerical responses of Anisopteromalus calandrae (Howard) and Lariophagus distinguendus (Hymenoptera: Pteromalidae) reared continuously on the rice weevil, Sitophilus oryzae (L.), to the adzuki bean weevil, Callosobruchus chinensis (L.), were tested. Both parasitoids indicated weaker ...

Functional and numerical responses of Anisopteromalus calandrae (Howard) and Lariophagus distinguendus (Hymenoptera: Pteromalidae) reared continuously on the rice weevil, Sitophilus oryzae (L.), to the adzuki bean weevil, Callosobruchus chinensis (L.), were tested. Both parasitoids indicated weaker functional and numerical responses to the various densities of the adzuki bean weevil than to those of the rice weevil. Attack rate of the parasitoids on the adzuki bean weevil was also significantly lower than on the rice weevil. The effect of host alternation on L. distinguendus was more remarkable than that on A. calandrae: Attack rate of L. distinguendus on the adzuki bean weevil was so low that the effect of handling time on host searching was masked. The results suggested that host alternation can play an important role in the host-parasitoid interaction.

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