Study on Flying Behavior of Tiphia popilliavora Rohwer in Two Types of Inter-Cropping Fields

<正> A study was conducted in corn-peanut and sweet potato-peanut fields on the flying behavior of the white grub parasitoid Tiphia popilliavora Rohwer wasps. Observation on the first three times of flying, after the wasps being released. revealed that the first flying was an escape style and not showed preference to land on any special crops. 81. 82% wasps landed on corn leaves at the second flying but stayed for just about 3 min. In the sweet potato-peanut field, 51.43% wasps landed on sweet potato in contrast with 48.57% landed on peanuts and in the afternoon 33. 53% on sweet potato compared with 76.4% landed on peanut field. Majority preferred landing on peanut field on the third flying in both type fields of inter-cropping. Behavior of flying was different between morning and afternoon. The time length between two flies showed that wasps were more active in the morning than in the afternoon.