Laboratory Assessment on Virulence of Isaria fumosorosea against Multiple Species of Sucking Insects

doi:10.16409/j.cnki.2095-039x.2018.01.010

Abstract

Abstract: Laboratory assessment was conducted to determine the virulence of Isaria fumosorosea Ifu13a against multiple sucking insect species that are serious pest of crops and ornamental plants. Pathogenicity of I. fumosorosea against the insect species, Stephanitis nashi (Hemiptera:Tingidae), Jacobiasca formosana (Hemiptera:Cicadellidae), Trialeurodes vaporariorum (Hemiptera:Aleyrodidae) were determined by exposing them to conidia suspension of I. fumosorosea at 1.0×10⁸, 1.0×10⁷, 1.0×10⁶, and 1.0×10⁵ conidia/mL. The strain Ifu13a showed high pathogenicity to J. formosana and T. vaporariorum adults and 100% corrected mortality was observed in the treatments with conidia concentrations over 1.0×10⁶ conidia/mL.Half lethal time (LT₅₀) to J. formosana and T. vaporariorum increased from 4.12 d to 5.43 d and 4.77 d to 5.32 d, respectively, with inoculated concentration decreased from 1.0×10⁸ to 1.0×10⁶ conidia/mL. Half lethal concentration (LC₅₀) to J. formosana and T. vaporariorum was 3.90×10³ and 3.03×10⁴ conidia/mL, respectively. Relatively weak pathogenicity was observed to S. nashi, in which the highest corrected mortality of 81.25% occurred in the 1.0×10⁸ conidia/mL treatment. Accordingly, the LC₅₀for S. nashi was determined at 6.88×10⁵ conidia/mL. The strain Ifu13a showed great potential on simultaneous control of multiple sucking insects.

Key words: Isaria fumosorosea, Stephanitis nashi, Jacobiasca formosana, Trialeurodes vaporariorum, pathogenicity

CLC Number:

S482.3

WANG Bin, CAO Na, GHULAM Ali Bugti. Laboratory Assessment on Virulence of Isaria fumosorosea against Multiple Species of Sucking Insects[J]. journal1, 2018, 34(1): 86-91.

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