大棚黄瓜霜霉病流行模拟模型的组建

由寄主生长、侵染、显症、病斑扩展、产孢和孢囊着落六个部分组成的黄瓜霜霉病流行模拟系统(简称SIMCD)能输出四个反映该病发展状态及势态的参量(R_(1-4))。其中R_4具有较强的预测能力。模拟试验结果表明:SIMCD较好地再现了大棚条件下黄瓜霜霉病流行速率持续较高这一主要特征;模拟的最高流行速率高达0.7以上,这比已报道的真菌病害中最高流行速率还高1/6。因此,建议在防治策略决策中优先考虑控制流行速率。

MODELLING OF THE CUCUMBER DOWNY MILDEW UNDER PLASTIC SHELTER CONDITIONS

The SIMCD was made up of six factors,i.e.host growth,infec-tion,disease apparition,lesion expansion,sporulation and sporangiadeposition,and has four output variables (R_(1-4)) reflecting thestate and trend of epdemic system.The simulation results showed thatSIMCD could better reappear the essential characteristics of downymildew of cucumber under plastic shelter,whose maximum infec-tion rate could increase up to 0.7 which is 1/6 more than that offungal diseases sofar reported.Therefore,it was suggested that con-trol of epidemic speed should be emphased in the plant disease manage-ment strategy. The development of ecological control of the disease was also dis-cussed.