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http://dx.doi.org/10.11626/KJEB.2018.36.4.538

Control Effect of Alternative Fungicide Spraying System on Powdery Mildew Caused by Podosphaera xanthii on Greenhouse Cucumber  

Park, Se-Keun (Crop Protection Division, National Institute of Agricultural Science, RDA)
Park, Bue-yong (Crop Protection Division, National Institute of Agricultural Science, RDA)
Jeong, In-Hong (Crop Protection Division, National Institute of Agricultural Science, RDA)
Jeon, Sung-wook (Crop Protection Division, National Institute of Agricultural Science, RDA)
Ryu, Hyun-ju (Crop Protection Division, National Institute of Agricultural Science, RDA)
Lee, Sang-bum (Crop Protection Division, National Institute of Agricultural Science, RDA)
Publication Information
Korean Journal of Environmental Biology / v.36, no.4, 2018 , pp. 538-543 More about this Journal
Abstract
Powdery mildew caused by Podosphaera xanthii is a disease in cucurbit crops especially in green house. The objective of this study was to determine the effect of alternative fungicide spraying system for control of powdery mildew disease. We selected four fungicides with different mode of action and made three treatment combinations of each fungicide in 2017. Pyraclostrobin-flutianyl-penthiopyrad treatment showed the highest control value (87%) while, pyraclostrobin-pyraclostrobin-pyraclostrobin treatment showed the lowest control value (32.5%). So it seemed like the treatment was not suitable for control of powdery mildew. In 2018, pyraclostrobin of pyraclostrobin-flutianyl-penthiopyrad was replaced to contact fungicide called iminoctadine-tris-albesilate and compared control effect of two treatments. Two of the treatments showed similar control value (87.0% for pyraclostrobin, 89.0% for iminoctadine-tris-albesilate). These two tests in 2017 and 2018 indicated that alternative treatment of different fungicides is essential for controlling of powdery mildew and inhibiting development of fungicide resistance.
Keywords
powdery mildew; fungicide resistance; alternative spraying system; disease severity index; image analysis;
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