Screening of Efficient Metarhizium anisopliae Strains for Frankliniella occidentalis and Its Application in Peanut Field

doi:10.16409/j.cnki.2095-039x.2021.03.013

Abstract

Abstract: Frankliniella occidentalis is a worldwide quarantine pest, which can cause serious yield reduction of many leguminous host plants, including peanuts. Metarhizium anisopliae plays an important role in biological control of F. occidentalis. In this study, the M18-8-4 Strains were screened out from 23 M. anisopliae strains, of which the F1 and F2 strains were obtained by UV mutagenesis. In this study, the high toxic strains were obtained through toxicity tests in the laboratory, and their control of F. occidentalis was tested in the field. The results showed that, when tested at the same concentration of spore suspension, the strain F2-M18-8-4 had the strongest laboratory toxicity to F. occidentalis, with a median lethal time of 2.13 d. The control efficacies of F2-M18-8-4 and 3 chemical pesticides on F. occidentalis were evaluated in terms of the corrected population decline rate of F. occidentalis, the corrected peanut leaf protection rate, and the peanut yield increase rate. The corrected population decline rate of F. occidentalis did not differ significantly between F2-M18-8-4 and the 3 chemical pesticides at 7 days and 10 days post application, whereas at 15 days post application, the corrected population decline rate of F. occidentalis was higher in F2-M18-8-4 than in the 3 pesticides reaching 79.52%; and the peanut leaf protection rate was the highest, up to 63.58%, followed by Spinetoram at 58.11%. The peanut yield increase rate of F2-M18-8-4 was 9.09%. The results suggest the highly virulent strains can substitute for chemical pesticides in the control of F. occidentalis.

Key words: Metarhizium anisopliae, Frankliniella occidentalis, virulence, control effect, peanut

CLC Number:

PEI Songsong, WU Xuan, LI Ruijun, ZHAO Dan, LU Xiujun, GUO Wei. Screening of Efficient Metarhizium anisopliae Strains for Frankliniella occidentalis and Its Application in Peanut Field[J]. Chinese Journal of Biological Control, 2021, 37(4): 732-739.

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