Research in Plant Disease 2007;13(2):104-109.
Published online August 30, 2007.
양파 연작지의 분홍색뿌리썩음병 방제를 위한 담수처리 효과
문진성, 이종태, 하인종, 황선경, 송원두, 천미건, 이찬중
 
Influence of Soil Flooding on Control of Pink Root Disease in Onion Crop
Jin Seong Moon, Jong Tae Lee, In Jong Ha, Seon Gyeong Whang, Wan Doo Song, Mi Geon Cheon, Chan Jung Lee
Abstract
Pink root disease of onion, a known worldwide constraint upon onion production, significantly reduces crop levels in the main Korea cultivation area. In order to examine the effect of flooding on incidence of pink root disease caused by Pyrenochaeta terrestris and on onion growth and on populations of soil fungi, field experiments were conducted during two seasons, 2003/04 and 2004/05 at Onion Research Institute. Populations of soil fungi from fields were assayed on selective media. Flooding treatment was effective in reducing populations of P. terrestris, Pythium spp., and Rhizoctonia sp. in soil; fungal populations in soils flooded for 90 days were reduced to 1/2 to 1/3 of those in non-flooded soils. In nursery bed, protective activities of soils flooded for over 60 days were 93.5 to 99.2% and their pink root incidences were less than 5%, which were 1/11 to 1/18 of that in control. Increased yield of onion bulbs was associated with control of soil borne pathogenic fungi by flooding treatments. As flooding period was prolonged, bulb grade showed the tendency to increase. Soil flooding for over 60 days resulted in effective disease control, facilitated accurate planning of plant population in the field, extension of the growing-season and consequently higher yields of better quality.
Key Words: Flooding..Onion, Pink root, Pyrenochaeta terrestris


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