Diversity and Dynamic of Parasitoid Wasps and Lepidopteran Insects during Growth Stages of Rice

doi:10.16409/j.cnki.2095-039x.2017.05.003

Abstract

Abstract: Parasitoid wasps are important natural enemies in paddy rice and play an important role in biological control. However, their role is significantly affected by many factors. To investigate the effect of different crop growing stage on the diversity of parasitoids wasps and lepidopteran insects, we used Malaise trap to collect the parasitoid wasps and lepidopteran insects in rice fields. The results showed that the population size of parasitoid wasps was far more than lepidopteran insects in each growth period. The Ichneumonidae, Braconidae, Trichogrammatidae, Mymaridae and Scelionidae were the dominant wasp groups in rice fields, accounting for 11.80%, 11.71%, 9.18%, 15.51% and 11.83% of the total wasps population size, respectively. Among the order, Lepidoptera, Pyralidae, Noctuidae, Tortricidae and Nymphalidae were the dominant species, accounting for 22.32%, 20.87%, 26.28% and 12.75% of the total, respectively. The number of parasitic wasps increased at the initial stages of rice and then decreased with the development of rice, reaching the highest at the milky stage and differed significantly from other seven growth stages. The Shannon diversity index and the Simpson index of the parasitic wasps did not vary significantly, but the evenness index decreased at the milky stage (0.790) and then gradually increased until harvest. The number of Lepidopteran insects also increased at the early rice stages and then decreased with the development of the rice, and reached the highest at the flowering stage and differed significantly from other growth stages. There were no significant differences in the Shannon diversity index and the Simpson index of Lepidopteran insects among the rice stages. However, the evenness index of Lepidoptera insect fluctuated greatly from the rice heading stage to the ripening stage and differed significantly among many stages. So the growth stage of rice affects the population size of parasitic wasps and Lepidopteran insect, and has significant effects on diversity and richness of parasitic wasps and Lepidopteran insect in specific stage.

Key words: parasitoid wasp, Lepidopteran insect, malaise trap, diversity, rice growth stages

CLC Number:

S476.3

SHEN Zhaocan, CHEN Long, WU Jiadong, LI Yuanxi, WANG Su. Diversity and Dynamic of Parasitoid Wasps and Lepidopteran Insects during Growth Stages of Rice[J]. journal1, 2017, 33(5): 590-596.

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