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KMID : 0379120010290010072
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Korean Journal of Mycology
2001 Volume.29 No. 1 p.72 ~ p.74
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Occurrence of the Collar Rot of Water Cress (Oenanthe javanicav) Caused by Sclerotium rolfsii
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Park Chang-Suk
Kang Soo-Woong
Kwon Jin-Hyeuk
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Abstract
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A destructive collar rot of water cress (Oenanthe javanicav) occurred in the commercial farm at Karye-myon, Uiryong-gun, Kyongsangnam-do in 2000. The causal fungus caused stem rot, crown rot, wilt or blight of water cress and the disease incidence in 3 fields ranged from 28.6 to 42.8%. White mycelia spread over tissues near the soil surface or stems, and sclerotia developed on the lesions at late season. The fungus grew well on PDA at 20℃ and the typical clamp connection was formed on its tough white mycelia 4.1∼10.3 ㎛. The fungus also formed white mycelia mats and sclerotia at 20℃ on PDA. The sclerotia were globoid and sized 1.0∼6.3 × 1.0∼5.2 ㎜ (av. 2.4∼2.2 ㎜). The causal fungus of collar rot disease was identified as Sclerotium rolfsii on the basis of mycological characteristics and pathogenicity test. This is the first report on the collar rot of water cress caused by Sclerotium rolfsii in Korea.
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