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http://dx.doi.org/10.4489/KJM.2007.35.2.115

Cause and Control of Lettuce Powdery Mildew Caused by Podosphaera fusca  

Lee, Sang-Yeob (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
Kim, Yong-Ki (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
Lee, Young-Ki (Plant Pathology Division, National Institute of Agricultural Science and Technology, Rural Development Administration)
Publication Information
The Korean Journal of Mycology / v.35, no.2, 2007 , pp. 115-120 More about this Journal
Abstract
Powdery mildew caused by Podosphaera fusca is one of the most important diseases in leafy lettuce (Lactuca sativa L.). Since the disease has been a threat to safe cultivation of leafy lettuce, its control methods have to develop to produce good quality of lettuce for farmer and consumer. Occurrence of lettuce powdery mildew is increasing more and more due to continuous cultivation of lettuce all through the year, non-removal of diseased plant parts of lettuce, spray of inadequate fungicides by mistaken acknowledge of lettuce powdery mildew for lettuce downy mildew, etc. The control effect of five fungicides against lettuce powdery mildew was examined in a plastic greenhouse located in Suwon. When fungicides were sprayed three times at 10 days-intervals in the early stage of occurrence of powdery mildew, the incidence of powdery mildew in the plants treated with kresoxim-methy SC, azoxystrobin SC, Ampelomyces quisqualis AQ94013 WP, Paenibacillus polymyxa AC-1 SC and Bacillus subtilis Y 1336 WP was 0.7%, 0.7%, 26.0%, 36.7% and 42.0%, respectively, whereas the incidence of non-treated control was 55.3% on eight days after final application. Phytotoxicity of five fungicides tested was not observed in lettuce seedling plants.
Keywords
Ampelomyces quisqualis; Bacillus subtilis; Control; Fungicide; Lettuce; Paenibacillus polymyxa; Podosphaera fusca; Powdery mildew;
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