Mycobiology

The Korean Society of Mycology (한국균학회)
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Biological Control of Aphid Using Fungal Culture and Culture Filtrates of Beauveria bassiana

  • Kim, Jeong Jun (Agricultural Microbiology Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Jeong, Gayoung (Agricultural Microbiology Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Han, Ji Hee (Agricultural Microbiology Division, National Academy of Agricultural Science, Rural Development Administration) ;
  • Lee, Sangyeob (Agricultural Microbiology Division, National Academy of Agricultural Science, Rural Development Administration)
  • Received : 2013.11.05
  • Accepted : 2013.11.22
  • Published : 2013.12.31
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Abstract

Aphids are one of the most destructive pests in crop production such as pepper, cucumber, and eggplants. The importance of entomopathogenic fungi as alternative pest control agents is increasing. Conidia of entomopathogenic fungi are influenced by environmental conditions, such as temperature and relative humidity, and cause slow and fluctuating mortality. These factors have prevented wider application and use of biocontrol agents. For investigation of means of mitigation of such problems, we conducted bioassays with 47 fungal culture filtrates in order to evaluate the potential of secondary metabolites produced by entomopathogenic fungi for use in aphid control. Among 47 culture filtrates cultured potato dextrose broth, filtrate of Beauveria bassiana Bb08 showed the highest mortality (78%) against green peach aphid three days after treatments. Filtrate of Bb08 cultured in Adamek's medium showed higher toxicity as 100% to third instar nymphs of the aphid compared with seven other filtrates cultured in different broths amended with colloidal chitin or oil. The culture filtrates and fungal cultures from media amended with colloidal chitin or oil had lower control efficacies than filtrates without these additives in three different media. These results indicate that the fungal culture fluid or culture filtrate of B. bassiana Bb08 cultured in Adamek's medium has potential for development as a mycopesticide for aphid control.

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References

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