Mycobiology

The Korean Society of Mycology (한국균학회)
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Dual Biocontrol Potential of the Entomopathogenic Fungus, Isaria javanica, for Both Aphids and Plant Fungal Pathogens

  • Kang, Beom Ryong (Department of Applied Biology, College of Agriculture and Life Sciences, Chonnam National University) ;
  • Han, Ji Hee (Agricultural Microbiology Division, National Institute of Agricultural Sciences, RDA) ;
  • Kim, Jeong Jun (Agricultural Microbiology Division, National Institute of Agricultural Sciences, RDA) ;
  • Kim, Young Cheol (Department of Applied Biology, College of Agriculture and Life Sciences, Chonnam National University)
  • Received : 2018.06.18
  • Accepted : 2018.10.29
  • Published : 2018.12.31
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Abstract

Dual biocontrol of both insects and plant pathogens has been reported for certain fungal entomopathogens, including Beauveria bassiana and Lecanicillum spp. In this study, we demonstrate, for the first time, the dual biocontrol potential of two fungal isolates identified by morphological and phylogenetic analyses as Isaria javanica. Both these isolates caused mortality in the greater wax moth, and hence can be considered entomopathogens. Spores of the isolates were also pathogenic to nymphs of the green peach aphid (Myzus persicae), with an $LC_{50}$ value of $10^7spores/mL$ 4 days after inoculation and an $LT_{50}$ of 4.2 days with a dose of $10^8spores/mL$. In vitro antifungal assays also demonstrated a strong inhibitory effect on the growth of two fungi that are pathogenic to peppers, Colletotrichum gloeosporioides and Phytophthora capsici. These results indicate that I. javanica isolates could be used as novel biocontrol agents for the simultaneous control of aphids and fungal diseases, such as anthracnose and Phytophthora blight, in an integrated pest management framework for red pepper.

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References

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