Abstract
2005년부터 2006년까지 진주시 초장동 농가육묘장에서 대목으로 사용한 박 (품종 : FR 커플)과 접수로 사용한 수박 (품종 : 삼복꿀수박) 에서 P. cubensis에 의한 노균병이 발생하였다. 병징은 갈색 또는 암갈색의 작은 반점이 생기고 진전됨에 따라 다각형의 병반이 형성되고 심할 경우 시들어 말라죽는다. 포자낭은 난형 또는 타원형으로 크기는 <TEX>$20{\sim}32{\times}14{\sim}18{\mu}m$</TEX>이었다. 포자낭경은 직립하여 나뭇가지 모양으로 끝부분에 포자낭을 많이 형성하며 크기는 <TEX>$140{\sim}380{\times}4{\sim}8{\mu}m$</TEX>이었다. 수박에서 병원성을 검정하였다. 대목으로 사용한 박과 접수로 사용한 수박에서 발생한 병원균의 균학적 특징을 조사한 결과, Pseudoperonospora cubensis에 의한 노균병으로 동정되었다. Downy mildew caused by Pseudoperonospora cubensis (Berkeley & Curtis) occurred on the cotyledon of gourd (Lagenaria leucantha cv. Sambokkkul) and scion of watermelon (cv. FR couple) in commercial nursery around Jinju city, Gyeongnam province in Korea in 2005 and 2006. The disease symptoms usually started with water-soaking lesions on cotyledon and then the infected leaves became withered and eventually died. The sporangia of the pathogen were one-celled, ovoid to ellipsoid in shape, pale grayish in color, and <TEX>$20{\sim}32{\times}14{\sim}18{\mu}m$</TEX> in size. Sporangiophores were errect, branched, and <TEX>$140{\sim}380{\times}4{\sim}8{\mu}m$</TEX> in size. Pathogenicity of the causal organism was proved according to artificial inoculations. Although the virulence of the causal fungus on the host plants was not strong, it produced typical symptoms. The causal organism was identified as Pseudoperonospora cubensis (Berkeley & Curtis) based on the mycological characteristics of the fungus and pathogenicity. This is the first report on downy mildew of watermelon caused by P. cubensis in Korea.
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