Effect of Potassium Phosphonate on the Control of Potato Basal Stem Rot (Pythium myriotylum) in Hydroponics

Hong, Soon Yeong; Kang, Hyeong Sik; Kang, Yong Kil; Jee, Hyeong Jin

Research in Plant Disease 2004;10(2):142-144.
Published online June 30, 2004.

아인산염을 이용한 감자 줄기기부썩음병 방제

홍순영, 강형식, 강영길, 지형진

Effect of Potassium Phosphonate on the Control of Potato Basal Stem Rot (Pythium myriotylum) in Hydroponics

Soon Yeong Hong, Hyeong Sik Kang, Yong Kil Kang, Hyeong Jin Jee

Abstract

Effect of potassium phosphonate on control of potato basal stem rot caused by Pythium myriotylum in hydroponics system was evaluated at spring and fall cultivation in Jeju island in 2001. Potassium phosphonate 200 ppm treatment, which was directly supplemented into the nutrient solution, showed 90.5%, and 100 ppm treatment showed 50.5% control value in spring cultivation. Fall cultivation, potassium phosphonate 200 ppm treatment showed 100%, and 100 ppm treatment showed 69.9% control value. Potassium phosphonate 200 ppm treatment, basal stem rot of potato started to develop 10 days ofter inoculation into the hydroponics system showed 8.0% in infection rate. Potassium phosphonate 100 ppm treatment, after 5 days showed 10.0%, and after 10 days showed 20.0% infection rate, but the non-treated was after 5 days showed 56.7%, and after 10 days showed 96.9% infection rate.

Key Words: Basal stem rot, Potassium phosphonate, Potato