2020年北京房山酿酒葡萄霜霉病发生动态监测

霜霉病是世界范围内葡萄上的一种重要流行性病害.2020年,本研究系统调查了北京市房山区3个酿酒葡萄酒庄中4个不同葡萄品种的霜霉病发生情况,并记录了实时温湿度、降雨数据和用药时间,还分析了葡萄霜霉病的发生与降雨、相对湿度和用药时间的关系以及不同葡萄品种对霜霉病感病性的差异.结果 表明:房山3个酿酒葡萄酒庄在2020年5月...

Monitoring on the occurrence of grape downy mildew in Fangshan, Beijing in 2020

Downy mildew is an important epidemic disease on grapes worldwide.Occurrence of downy mildew on four different wine grape varieties were investigated in three wineries in Fangshan district,Beijing in 2020.Meanwhile,air temperature,relative humidity,rainfall and pesticide schedule were recorded,and the relationship between the incidence of grape downy mildew and meteorological and management factors,as well as the difference of susceptibility between four wine grape varieties were analyzed.The results showed that the infected leaves by downy mildew was initially observed in the wineries of Fangshan on May 29th,2020,and then the percentage of infected leaves increased slowly from June to August.After August,the percentage of infected leaves increased greatly,and downy mildew became serious.From June to August,multiple rainfall and the duration over 90%relative humidity were suitable for pathogen infection and sporulation.However,timely spraying fungicides after rainfall slowed down the disease development.The percentages of infected leaves by grape downy mildew in three places were lower than 2.86%during this period.By comparing the difference of average percentage of infected leaves between four varieties of the wineries,‘Cabernet Sauvignon’(83.19%of incidence)and‘Merlot’(63.77%)were more susceptible than‘Chardonnay’(40.86%)and‘Marselan’(39.71%).This survey clarified the occurrence date of downy mildew of different wine grape varieties and their development in Fangshan,Beijing,and the possible reasons that lead to the differences in percentage of infected leaves caused by grape downy mildew between four wine grape varieties under different weather and management conditions were also analyzed,which provide a reference for field management of grape downy mildew in future.