Abstract: By using wind tunnel technique, the behavioral response of Meteorus pulchricornis during searching host larvae of Spodoptera exigua as affected by the experiences from immature to adult emergence, and from oviposition were observed. Food plants had obvious effects on host larvae, in which the immature development and adult emergence of M. pulchricornis were accomplished. Soybean plant exercised significant effects on the behavioral response of naive parasitoids, compared to cotton and Chinese cabbage. For the parasitoids with an experience of oviposition once while searching hosts, the effects were dependent on the plant species the host larvae fed with, i.e., a significant response was performed to soybean and Chinese cabbagehost larvae complexes. For those with the experiences of oviposition twice on different plants, the followup behavioral response was dependent both on plant species and on their sequence experienced. When the oviposition experience happened between soybean and Chinese cabbage, the soybeanhost larvae complex was always preferred, regardless of the sequence experienced. However, when the oviposition experience occurred between soybean and cotton, the parasitoid only favored the recently experienced soybeanhost larvae complex. When the oviposition experience was between cotton and Chinese cabbage, the parasitoid only showed significant response to the recently experienced Chinese cabbagehost larvae complex. It is suggested that both the experiences from immature development and adult emergence site and from oviposition can affect the followup behavioral responses, but the effects were depended on the plant species the host larvae fed with.

Key words: Fungal-feeding nematode, Fungi, Nematode-fungi interaction, N-mineralization