Abstract
Chinese chives (Allium tuberosum Roxb.) is the fourth most important allium crop in Korea after bulb onion (A. cepa), Welsh onion (A. fistulosum), and garlic (A. sativum). During winter of 2014-2015, symptoms similar to Sclerotinia stem rot on other Allium hosts were observed in commercial crops of Chinese chives ‘Green Belt’ in polyethylene tunnels in Iksan, Korea (35°56'37N; 126°59'33E). Disease incidence ranged between 10 and 20%. White mycelial mats containing sclerotia of 2 to 8 mm in diameter were observed on dead plants and the nearby soil surface. Symptomatic, mold-grown tissues were surface-disinfested in 1% sodium hypochlorite for 1 min and placed on water agar plates. Hyphal tips growing out of the tissue were subsequently transferred onto potato dextrose agar (PDA). Pure cultures consistently yielded abundant white mycelia. Two-week-old cultures on PDA at 16 to 20°C developed sclerotia on the peripheral edges of the plate. The pathogen was morphologically identified as Sclerotinia sclerotior...
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