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Effects of host fecal pellet and synthetic kairomone on host‐searching and postoviposition behavior of Apanteles kariyai, a parasitoid of Pseudaletia separata

The response of female Apanteles kariyai (Watanabe) to a fecal pellet of its host, Pseudaletia separata (Walker) was observed in the laboratory. The arrestment response of A. kariyai to a fecal pellet was characterized by a reduction of walking speed and increased turning rate. During arrestment, A. kariyai turned back towards the fecal pellet several times after she had left it. Using patches impregnated with the synthetic kairomone 2,5‐dihexadecyltetrahydrofuran, it was determined that the time spent in arrestment response increased with increasing kairomone concentration but leveled off above 10−4 mg kairomone per patch. A. kariyai demonstrated two modes of arrestment response towards the patch (patch‐searching mode and patch‐edge‐following mode), which were dependent on the amount of kairomone per patch. During successive visits to the patch, walking speed increased whereas time spent and distance walked on the patch decreased. Postoviposition behavior of A. kariyai was also studied using the kairomone patch. Immediately after oviposition, the wasp did not respond to the kairomone stimuli or to a host and always walked away from the patch.