沈阳地区葡萄褐斑病流行规律初步研究

Epidemics of Phaeoisariopsis vitis in Shenyang

通过对沈阳地区‘香悦’葡萄褐斑病流行规律进行初步研究,认为葡萄褐斑病发生和流行与生育期、温度和相对湿度有密切关系。经过对比分析,Logistic模型可较好地模拟沈阳地区‘香悦’葡萄褐斑病病情指数增长情况。经Logistic模型推导,该病指数增长期时间为6月下旬至7月上旬;逻辑斯蒂期时间为7月上旬至9月中旬,衰退期时间为9月中旬以后,其中指数增长期是最佳药剂防治时间;该病指数增长期积温为0~994.2℃;逻辑斯蒂期积温为994.2~3 159.2℃;指数增长期累积湿度为0~3 344.03%,逻辑斯蒂期累积湿度为3 344.03%~10 439.1%。

Based on the epidemics of grape leaf rot on‘Xiangyue’grape in Shenyang,occurrence and its epidem-ics were closely related with growth period,temperature and relative humidity. Logistic model could well reflect the increase of grape leaf rot in Shenyang. It was predicted that the exponential phase of grape leaf rot was from late June to early July in Shenyang,and the logistic phase was from early July to mid-September,while the decline phase was from mid-September to the end of corn growth stage. The exponential phase was also the best time for chemical control. The exponential-phase accumulated temperature （AT）was 0-994.2 ℃ ,and the accumulated relative humidity （ARH）was 0-3 344.03% . The Logistic-phase AT was between 994.2 ℃ and 3 159.2 ℃ ,and ARH was between 3 344.03% and 10 439.1% .