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Entomopathogenic fungi-mediated biological control of red mite, Dermanyssus gallinae in field
So Eun Park,Ye Ram Im,In Soo Jeon,Yu Lim Park,Yu Jin Jeong,Sue Yeon Lee,Kim Jong Cheol,Jae Su Kim 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
The red mite, Dermanyssus gallinae (Mesostigmata: Dermanyssidae), is one of the most serious pests in chicken farming and causes serious economic losses. Overuse of chemical insecticides has caused pest resistance as well as environmental residual toxicity to chickens and eggs. Therefore, given the warm and humid conditions of chicken farms, alternative application with entomopathogenic Beauveria bassiana was investigated to control D. gallinae. Based on the characterization and virulence assays of B. bassiana isolates against red mite, a red mite-pathogenic fungal library was constructed. A total of highly virulent six B. bassiana isolates were selected from the virulence screening and tested fungal virulence, conidial production, and thermotolerance. JEF-410 considered to be the best candidate for industrialization showed a dose-dependent virulence against red mite nymphs. JEF-410 conidia from millet granule-based mass culture were applied to a commercial chicken farm and it showed a significant suppression of population increase under high humidity conditions. In conclusion, B. bassiana JEF-410 having higher control efficacy than cypermethrin could be effectively used to control D. gallinae in the fungus-friendly humid chicken farms. Challenge of controlling the red mite using B. bassiana in chicken farm, such as formulation and circulation period is possibly improved.
Promising entomopathogenic fungal isolates for biological control of Spodoptera frugiperda
In Soo Jeon,So Eun Park,Ye Ram Im,Yu Lim Park,Yu Jin Jeong,Ki Jung Kim,Sue Yeon Lee,Jae Su Kim 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
Spodoptera frugiperda is an invasive polyphagous pest derived from America. It has annually invaded to Korea at summer season since it was firstly reported in 2019. To minimize the damages by S. frugiperda, appropriate control methods should be studied and developed. This study aimed to assess the potential ability of entomopathogenic fungi as biological control agents against S. frugiperda. Ninety-three isolates of entomopathogenic fungi were selected to screen insecticidal activity against 2nd instar larvae of S. frugiperda. Among them, thirty-four isolates showed 100% mortality at 8 days after fungal treatments in laboratory condition. Conidial productivity and thermotolerance of conidia cultured on 1/4 SDA were evaluated to characterize the possibility for field application. Based on the characterization, about ten isolates were selected to determine the high virulence against S. frugiperda.