Pathogenicity of Ectropis grisescens Nucleopolyhedrovirus on Ectropis grisescens Warren and Ectropis obliqua Prout

doi:10.16409/j.cnki.2095-039x.2022.07.004

Abstract

Abstract: Ectropis grisescens Nucleopolyhedrovirus (EgNPV) is an important pathogenic microorganism of Ectropis grisescens Warren. A series of bioassays of E. grisescens and E. obliqua from two related species of tea were analyzed to determine its pathogenicity. Results showed that the LD-P equation for the 2^nd instar larvae of E. grisescens and E. obliqua was y＝0.943x＋0.3582; y＝0.663x＋1.614. And the value of LC₅₀ for the 2^nd instar larvae was 8.3×10⁴ PIB/mL and 1.3×10⁵PIB/mL. The mortality trend for 1^st―3^rd instar larvae of E. grisescens and E. obliqua infected by different concentrations of EgNPV were roughly the same. Reaching the same pathogenicity, the E. grisescens was one day faster than the E. obliqua when at the same age. The death rate of EgNPV was more than 80% to both 2^nd instar larvae of 1^st, 2^nd and 6^th generations when infected with EgNPV in the concentration of 2×10⁶PIB/mL. The results provided a basis for effectively improving the control effect of EgNPV.

Key words: EgNPV, Ectropis grisescens, Ectropis obliqua, pathogenicity

CLC Number:

S476.1

TAN Rongrong, CHEN Xun, HUANG Danjuan, WANG Hongjuan, MAO Yingxin. Pathogenicity of Ectropis grisescens Nucleopolyhedrovirus on Ectropis grisescens Warren and Ectropis obliqua Prout[J]. Chinese Journal of Biological Control, 2023, 39(3): 684-689.

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