It was found that occurrence of grape white rot caused by Coniella diplodiella(Speg.) Petrak & Sydow was closely correlated to temperature,growth period,humidity and rainfall in a 2-year study in the field.Generally,this disease occurs in late July in Liaoning Province.Its epidemics fitted the Logistic model.Among all factors,rainfall and relative humidity were the most important to influence its occurrence in the field.The best time for controlling this disease in Shenyang is early June.The Logistic model revealed that the exponential phase of grape white rot ranged from sprouting to early July,the logistic phase from early July to middle September,and the terminal phase after mid-September.This disease could be effectively controlled by using the germicides thiophanate-methyl-myclobutanil and carbendazim at its early stage.