Abstract
2007년 5월 전북 전주의 식물원에서 판매중인 아이비에서 줄기 하부가 검게 썩으며 급격히 말라죽는 증상으로부터 병원균을 분리 동정한 결과 Phytophthora cinnamomi로 동정되었다. 병원균의 형태적 특성은 비 돌출형의 탈락성이 없는 계란형, 장타원형 혹은 서양배형의 유주자낭을 형성하였고, 크기는 평균 <TEX>$33.8{\times}16{\mu}m$</TEX>였고, 구형의 후막포자를 다량 형성하였으며, 크기는 평균 직경이 <TEX>$19.7{\mu}m$</TEX>였다. 유성생식형은 자웅이주로 A1 mating type이 관찰되었고 난포자의 크기는 직경이 <TEX>$26.2{\mu}m$</TEX>였다. 균사의 생육적온은 <TEX>$25{\sim}30^{\circ}C$</TEX>였다. 이상과 같이 국내 최초의 P. cinnamomi에 의한 아이비줄기썩음병의 발생을 보고하는 바이다. A stem and root rot disease of English ivy (Hedera helix) was found in the flower market, Jeonju, Chonbuk province, Korea in May 2007. A Phytophthora species was isolated from the diseased part of the plant. Based on the mycological properties and pathogenesis the isolate was identified as Phytophthora cinnamomi. The fungus produce ovoid sporangium which was ovoid to spherical and obpyriform which is noncaducous, non-papillate and averaged <TEX>$33.8{\times}16{\mu}m$</TEX> in dimension. Chlamydospores were abundantly produced on agar media and sized about <TEX>$19.7{\mu}m$</TEX> in diameter. The fungus was heterothallic and A1 mating type. Oospores were measured <TEX>$26.2{\mu}m$</TEX> in size. Optimum temperature for growth of the fungus was 25 to <TEX>$30^{\circ}C$</TEX>. Up to our knowledge, this is the first report demonstrating the stem rot on English ivy caused by P. cinnamomi in Korea.
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