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Damage on Wheat Growth and Yield by Sharp Eyespot (Rhizoctonia Cerealis) in Wheat Fields
Jong-Chul Park,Eun-Suk Lee,Hak-Sin Kim,Chun-Sik Kang,Chul-Soo Park,Jung-Jun Lee,Jun-Hee Lee,Young Guen-Cheong,Tae-Il Park,Tae-Soo Kim,Ki-Jong Kim,Jung-Gon Kim 한국작물학회 2010 한국작물학회 학술발표대회 논문집 Vol.2010 No.04
In April 2009 two wheat cropping fields, Jeonju and Gimje in Jeonbuk Province, showed yellowish leaves and dead tillers in stem bases with sharp lens-shaped darken lesions. The disease incidence in wheat cultivar Jopummil ranged from 2.2 to 43.5%, with a mean incidence of 28.5%. The different incidence was related the seeding date. Earlier seeding (15th October) fields showed severe incidence as 25.5 to 43.5% while late seeding around the end of October weakened incidence in the cultivar. Based on morphology and pathogenic characteristics, the fungus was identified as Rhizoctonia cerealis that causes sharp eyespot in wheat. The disease severely affected growth and yield including culm length, spike length, number of kernel. The average culm length of the infected cv. Jopummil was 66 cm while that of healthy plant was 74 cm. The number of kernel and tiller per unit area was decreased only in the case of more than 13% incidence, but the length of heads was not significantly different compared with that of the healthy plants.