Korean journal of applied entomology (한국응용곤충학회지)

Korean Society of Applied Entomology (한국응용곤충학회)
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Occurrence of the Entomopathogenic Fungus Zoophthora radicans (Entomophthorales: Entomophthoraceae) in Jeollabuk-do, Korea

전라북도에서 곤충 병원성 곰팡이 Zoophthora radicans (Entomophthorales: Entomophthoraceae)의 발생

  • Choi, Seonu (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Kim, Juhee (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Seo, Kyoungwon (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Moon, Younghun (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Gongjun (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Lee, Changkyu (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Kim, Jaesu (Department of Agricultural Biology, College of Agriculture & Life Scinece, Chonbuk National University) ;
  • Kim, Jinho (Jeollabuk-do Agricultural Research and Extension Services)
  • Received : 2016.11.04
  • Accepted : 2017.05.17
  • Published : 2017.06.01
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Abstract

The entomopathogenic fungus Zoophthora radicans (Entomophthorales: Entomophthoraceae) was found to infect Cnaphalocrocis medinalis, Plutella xylostella, Myzus persicae and one unidentifed species. Samples of the fungus were collected from three areas (Jinan, Gimje, and Iksan) in Jeollabuk-do, Korea. Infected insects appeared in July and September, during which time population infection rate of Z. radicans on C. medinalis reached up to 46%. Zoophthora radicans hyphal bodies are rod-like to hyphoid, and primary conidia are bullet-shaped to long ovoid. The fungus was isolated from the surfaces of larvae and cultured in Sabouraud dextrose agar with yeast extract (SDAY). The optimal temperature range for mycelial growth was $20{\sim}28^{\circ}C$. Mycelium growth on SDAY supplemented with egg yolk and milk (SDAY-EM) was higher than on SDAY alone. Zoophthora radicans may play an important role in controlling insect population density using naturally induced epizootics.

곤충병원성 곰팡이 Zoophthora radicans (Entomophthorales: Entomophthoraceae)가 혹명나방, 배추좀나방, 복숭아혹진딧물과 진딧물인 미분류 1종을 감염시키는 것을 발견하였다. 이들은 전라북도 진안, 김제, 익산에서 수집되었고, 6월과 9월에 관찰이 가능하였다. 이 균에 감염된 혹명나방은 진안에서 수집되었고, 감염율이 46%에 달하였다. 감염된 곤충 충체로부터 균을 분리하여 Sabouraud dextrose agar with yeast extract (SDAY)를 이용하여 인공배양을 시도하였다. 그 결과, $20{\sim}28^{\circ}C$가 인공배양을 위한 최적온도로 판단되며, SDAY보다 SDAY supplemented with egg yolk and milk (SDAY-EM)에서 발육이 보다 양호하였다. 이 곰팡이는 자연적으로 발생함을 포장에서 확인할 수 있었다.

Keywords

References

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