Virulence of Nomuraea rileyi Nr5772 Isolate Against Spodoptera exigua

doi:10.11924/j.issn.1000-6850.casb18080115

Abstract

Abstract: The aim is to investigate the virulence of Nomuraea rileyi Nr5772 isolate against beet armyworm Spodoptera exigua, and provide a new technique for biological control of the pest. The larvae of beet armyworm were used as materials. Dipping method was adopted to test the LC50 and LT50 of the 3rd, 4th and 5th instar beet armyworm larvae in the conidia suspension of N. rileyi Nr5772 isolate. The results showed that LT50 of the 3rd, 4th and 5th instar larvae was 4.44 d, 4.48 d and 4.85 d, respectively, when exposed to 5×109 conidia/mL N. rileyi suspension; and the LC50 was 2.71×106 conidia/mL, 5.61×106 conidia/mL and 1.75×107 conidia/mL, respectively. In conclusion, N. rileyi Nr5772 isolate has effective pathogenicity to beet armyworm larvae and the virulence becomes stronger along with the increase of conidia concentration and the decrease of the larva instar.

CLC Number:

S476

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