Research in Plant Disease 2014;20(1):31-36.
Published online December 15, 2014.
시설 수박 흰가루병 방제를 위한 살균제 교차방제 체계
강효중1* · 김영상1 · 한봉태1 · 김태일1 · 노재관1 · 김이기1 · 신현동2
1충청북도농업기술원 수박연구소, 2고려대학교 환경생태공학부
Alternative Fungicide Spraying for the Control of Powdery Mildew Caused by Sphaerotheca fusca on Greenhouse Watermelon (Citrullus lanatus)
Hyo-Jung Kang1*, Youngsang Kim1, Bongtae Han1, Taeil Kim1, Jaegwan Noh1, Yeegi Kim1 and Hyeon-Dong Shin2
1Watermelon Research Institute, Chungcheongbuk-do Agricultural Research and Extension Services, Eumsung 369-824, Korea
2Division of Environmental Science and Ecological Engineering, Korea University, Seoul 136-701, Korea
Correspondence:  <p>Hyo-Jung Kang</p><p>Tel : +82,

Hyo-Jung Kang

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Received: January 09, 2014   Revised: February 28, 2014   Accepted: March 11, 2014
Alternative spraying was developed using fungicides and potassium phosphonate to control watermelon powdery mildew (WPM) caused by Sphaerotheca fusca under greenhouse condition. In 2010 trial, a total of 9 combinations of 6 fungicides which are legally registered in Korea and currently used on watermelon farms were tested for the control efficacy against WPM. Though the combination of chlorothalonil (Chl)-myclobutanil (My)-fenarimol (Fen)-hexaconazole (Hex) was the most effective (82.6%) in the first-year trial, it had the problem that My, Fen and Hex have the same mode of action. Therefore, in the second-year trial to improve the fungicide combination and to reduce fungicide application, fungicides and potassium phosphonate (P) combinations were tested for WPM control using 500 ppm aqueous potassium phosphonate solution which is both eco-friendly and showing different mode of action from the fungicides tested. The P-My-Fen-Hex applied at 10-day intervals provided relatively high control (75.6%), whereas Chl-My-Fen-P provided 31.8% control. To improve the control, fungicides and P were applied at 7-day intervals in the third-year trial. Though Chl-My-Fen-Hex provided the highest control (89.6%), P-My-Fen-Hex also provided relatively high control (83.5%) compared to 65.9 % control with Chl-My-Fen-P, which suggests that Chl-My-Fen-Hex could be replaced with P-My-Fen-Hex for WPM control.
Key Words: Control, Fungicide, Watermelon powdery mildew

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