Parasitism of Ectropis grisescens by Trichogramma dendrolimi

doi:10.16409/j.cnki.2095-039x.2021.03.002

Abstract

Abstract: Trichogramma dendrolimi Matsumura is one of the most important parasitic natural enemies of many agricultural and forestry pests. To evaluate the potential of T. dendrolimi for control of Ectropis grisescens Warren, we measured the functional response of T. dendrolimi to E. grisescens eggs at different densities, the interference effect of its own density under laboratory conditions, and t the parasitism of E. grisescens eggs under both cage and field conditions. The results showed that the functional response of T. dendrolimi to E. grisescens eggs conformed to Holling II model, with an instantaneous attack rate of 1.3179, a handling time of 0.0352 h, and a maximum parasitism capacity of 28.43 eggs/female. An interference effect of T. dendrolimi density on parasitism was observed, i.e., the parasitism rate of E. grisescens eggs increased continuously with the increase in T. dendrolimi density while the discovery area of T. dendrolimi decreased correspondingly. Under cage and field conditions, the parasitism rates of E. grisescens eggs were 25.94% and 37.00%, respectively. In conclusion, T. dendrolimi has a good control potential on E. grisescens eggs, which provides a theoretical basis for field application of the wasp in the control of E. grisescens.

Key words: Trichogramma dendrolimus, Ectropis grisescens, functional response, net cage, tea plantation

CLC Number:

S476.3

QIAN Xiaona, MA Yanxu, XU Wei, SUN Xiaoling. Parasitism of Ectropis grisescens by Trichogramma dendrolimi[J]. Chinese Journal of Biological Control, 2021, 37(4): 709-715.

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