Effect of Nectar Plant Cosmos bipinnata on the Population Dynamics of Predatory Natural Enemies

doi:10.16409/j.cnki.2095-039x.2021.07.025

Abstract

Abstract: Nectar plant, an important part of conservation biological control, can support the colonization of natural enemies in filed and enhance pest biological control. In order to evaluate the effect of nectar plants on natural enemies, population dynamics of natural enemies and pests in Cosmos bipinnata, Lythrum salicaria, Symphyotrichum novi-belgii strips were compared with those in the natural weed area, and the impact of cosmos on ladybird and aphid populations were evaluated under different planting densities. Results showed that, in comparison with the natural weed area, the population size of natural enemies and pests in L. salicaria was higher, and the population size of natural enemies in cosmos strip was higher while that of the pests was less, where the predatory ladybirds were the dominant natural enemies. The population size of ladybirds and aphids in cosmos differed significantly between planting densities, higher in cosmos strip with 50% planting density than that with 100% planting density, and the ratio of natural enemies to pests was significantly higher in cosmos strips of the two planting densities than that of the natural weed area. This study indicates that cosmos strip attracts and conserves natural enemies in filed and can be potentially used as nectar plants in habitat management for conservation biological control.

Key words: nectar plant strips, cosmos, ecological regulation, natural enemy, conservation biological control

CLC Number:

S476

FANG Yan, WANG Jie, TAN Yang, WANG Su, JIN Zhenyu, LI Shu. Effect of Nectar Plant Cosmos bipinnata on the Population Dynamics of Predatory Natural Enemies[J]. Chinese Journal of Biological Control, 2021, 37(5): 877-884.

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