气候对稻粒黑粉病发生危害的影响研究

EFFECTS OF CLIMATIC FACTORS ON THE EPIDEMIC OF RICE KERNEL SMUT {NEOVOSSIA HORRIDA)

稻粒黑粉病冬孢子萌发的适温和最适温分别为14～32℃和26～28℃。适温、高湿对田间次生小孢子数量增殖有利。开花时温度与发病程度呈显著负相关;降雨频率(X_1)和降雨量(X_2)与发病率(γ)呈极显著和显著相关,其回归模型为Y=一1.8038+0.3499X_1十0.

A systematic investigation in 1989~1992 of the occurrence and epidemic of rice kernel smut (Neovossia horrida)in Sichuan province showed that the chlamydospores of the pathogen germinated under 14~32℃ , the optimum germination temperature ranging from 26 to 28℃. With suitable temperature and high relative humidity , the number of v.condary microspores in the field greatly increased . A significant correlation seemed to exist between diseaes severity (Y) ,on the one hand , and rain frequency (X1) and rainfall (X2) ,on the other ,during the flowering period of the crop. A regression model was established as follows;Y = - 1. 8038 + 0 .499X1 + 0. 0837X2.