Effect of hosts and food of hosts on sex ratio, body size and wing form of progeny of Theocolax elegans
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Key Words：Theocolax elegans, wheat, maize, Sitophilus oryzae, Sitophilus zeamais, progeny
Abstract： The sex ratio, body size and wing forms of progeny of parasitoid, Theocolax el egans (Westwood), feeding on the rice weevil, Sitophilus oryzae (L.) or maize weevil, Sitophilus zeamails (Motschulsky) in wheat or maize, were investigated through trophic interaction among grains, grain pests, and parasitoids. The results showed that the amount of parasitoids offspring in both rice weevil and maize weevil feeding on rice was significantly higher than that on mzize. There was no significant difference of amount of offspring and sex ratio between rice weevil and maize weevil in rice. The body length of female offspring of T.elegans was significantly longer than of males. When parasitizing in rice weevl feeding on maize, the body size of both females and males was the minimum. When long_winged T. elegans parasitized weevils in rice, the amoun of long_winged progeny was significantly higher than those in weevils in maize. It indicated that T. elegans reproduced better in weevils feeding on rice than that on mzize.