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Pink Root of Onion Caused by Pyrenochaeta terrestris(syn.Phoma terrestris)
김용기,심홍식,Sang-BumLee,Chan-JungLee,Hee-DaeKim 한국식물병리학회 2003 Plant Pathology Journal Vol.19 No.4
Pink root of onion occurred in the fields of the Onion Experimental Station and in the main onion cultivation area in Korea in 1998 and 1999, respectively. The casual fungus of pink root was isolated only from apricot agar. Formation of pycnidia and pycnidiospores of the fungus was highest in alternating cycles of 12 hours near ultraviolet light and 12 hours in dark condition. Its morphological characteristics and pigment formation on water agar were identical with that of Pyrenochaeta terrestris. The optimum temperature for the growth of the fungus and disease development was 25-28oC. When onion seeds were inoculated with the spore suspension, incubated in test-tube and sown in potted soil, disease symptoms developed in onion roots 7 and 30 days after inoculation.
Soft Rot of Onion Bulbs Caused by Pseudomonas marginalis Under Low Temperature Storage
Yong-KiKim,이승돈,이상엽,Chung-SikChoi,Sang-BumLee 한국식물병리학회 2002 Plant Pathology Journal Vol.18 No.4
Soft rot occurred severely in onion bulbs stored under low temperature (5ºC) in storage houses at Changyoung, Kyungnam province, Korea in early 2000. Water-soaking and yellowish-brown lesions initially appeared on the outside scales of diseased onion bulbs, gradually progressing into the inside scales. Among the bacterial isolates obtained from the lesions, K-2 isolate was found to be responsible for the disease, which grew at a temperature range of from 0º to 36ºC with optimum temperature of 30º-33ºC. However, it showed strong pathogenicity to onion bulbs at 25ºand 5ºC at 3 days and 2 months, respectively. The bacterium also caused soft rot on potato and showed hypersensitive reactions to tobacco and potato. The causal bacterium of onion soft rot was identified as Pseudomonas marginalis based on morphological, biochemical, and physiological characteristics including LOPAT. Soft rot in onion under low temperature storage caused by P. marginalis has not been previously reported.