Research in Plant Disease 2003;9(3):179-182.
Published online September 30, 2003.
아인산염의 감자 역병 방제효과
홍순영, 이광석, 강영길, 지형진
 
Control of Potato Late blight (Phytophthora infestans) with Potassium Phosphonate
Soon Yeong Hong, Kwang Seok Lee, Yong Kil Kang, Hyeong Jin Jee
Abstract
Effect of potassium phosphonate on control of potato late blight was evaluated at two fields in Jeju island. The chemical showed 82.5% control value in field located at low seacoast with 100 m elevation, while dimethomorph copper oxychloride showed 75.9% control value. However, its control value was only 40% in another field located at mid-hilly area with 300 m elevation, in which environmental conditions of high humudity and often rainfall were favorable to the disease development. Application intervals of the phosphonate from 7 to 15 effectively suppressed the disease and did not show statistically different control values among the spraying intervals. Results indicated that phosphonate similarly or more effectively controls potato late blight than fungicide, however, its control value could be varied according to environmental conditions for the disease development and 15-d spraying intervals ware sufficient to suppress the disease.
Key Words: Potassium phosphonate, Control, Potato Late blight


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