Plants Produce Attractants for Apanteles kariyai, a Parasitoid of Pseudaletia separata; Cases of ‘Communication’ and ‘Misunderstanding’ in Parasitoid-Plant Interactions

Abstract

The behavioral response of female Apanteles kariyai WATANABE (Hymenoptera, Braconidae) to the volátiles of plant species, both food plants and non-food plants of the host larvae, Pseudaletia separata WALKER (Lepidoptera: Noctuidae) was tested in a Y-tube olfactometer. When uninfested leaves of corn (Zea mays L.) or rice (Oryza sativah.), which were the food plant species of the host larvae vs. clean air were offerred in the Y-tube olfactometer, A. kariyai significantly preferred the leaf odor to clean air. However, the wasps also significantly preferred the odor of plant species which cannot be the host’s food plant, such as mulberry (Moms bombycis KOIDZ.), dandelion (Taraxacum japonicum KOIDZ.), Welsh onion (.Allium fistulosum L.) and kidney bean (Phaselous vulgaris L.), to clean air in the olfactometer. From headspace analysis of uninfested detached corn leaf volátiles, (Z)-3-hexenol and (Z)-3-hexenyl acetate were identified as the main compounds and of these two compounds, only (Z)-3-hexenol attracted A. kariyai. The role of plant odor in the interaction between plants (the first trophic level) and A. kariyai (the third trophic level) is discussed. © 1991, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.