Abstract
Sclerotinia rot and Phytophthora blight are devastating diseases of perilla that can cause huge loss of perilla production. Screening disease resistant genetic resources is necessary to develop disease-resistant cultivars and conduct related research. The objective of this study was to find suitable inoculation methods for screening of Sclerotinia rot and Phytophthora blight in perilla germplasm. Three different inoculation methods [i.e., detached leaf (agar plug placed on start point of vein, 1/3 point of leaf vein & front side, back side), stem tip, and soil drenching] with three-growth stages (two, four & six-leaf stage) at two different temperatures (20 & 25°C) were assayed for their effectiveness for screening using IT 229019 & Sang-yeop perilla germplasm. Based on disease lesion, 20°C in two-leaf stage with detached leaf method (start point of vein) was found to be an efficient method for screening of Sclerotinia rot whereas 25°C in two-leaf stage with stem tip was an effective method for screening of Phytophthora blight in perilla germplasm. However, stem tip method was laborious as it required more time. Therefore, detached leaf method (start point of vein & back side) was a simple and rapid method that could be preferably used for screening of Sclerotinia rot and Phytophthora blight in perilla germplasm.
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