Regional Differences of Leaf Spot Disease on Grapevine cv. 'Campbell Early' Caused by Pseudocercospora vitis in Plastic Green House

Pseudocercospora leaf spot was major disease of grape cultivar `Campbell Early` in Korea. Leaf spot first appeared in early June and rapidly dispersed to other leaves through rainy season. Disease progress of leaf spot by Pseudocercospora vitis in plastic green house, in the two provinces (Gimje and Gimcheon), were investigated in 2007. Differences of Infected leaves (%) between cultivation systems were observed in field and plastic green house, but there was no difference between provinces. Micro environmental factors, such as temperature and relative humidity, were correlated with infected leaves by PROC REG procedure of SAS (Statistical Analysis System). As a result, regression model best described ($R^2