江苏免少耕麦田纹枯病发生规律研究

STUDIES ON THE OCCURRANCE OF WHEAT SHARP EYESPOT IN THE FIELDS WITH NO AND MINIMUM TILLAGE IN JIANGSU

不同耕作法对小麦纹枯病田间消长动态影响不大,免少耕田纹枯病病株率和病情指数略高于常规耕田,但年度间有波动。杂草对纹枯病影响较明显,免少耕田草害重,病害也重。肥力因素对病害的影响要大于耕作法对病害的影响,偏施氮肥会加重病害发生。早播加重免少耕田纹枯病病情,适期迟播可减轻病害发生。

No significant difference of the temporal dynamics of wheat sharpcyespot(Rhizoctona cerealis)was odserved among the different farmingmethods.The disease incidence and index in no and minimum tillagefields were slightly higher than those in ordinary tillage fields,but theychanged in different years.The weeds in fields influnced odviously thedisease.Generally,the more weed damage the severer disease occurredin the no and minimum tillage fields.The effect of fertility factors onthe disease was higher than that of the farming methods.High nitrogenfertilizing increased the disease incidence.Moreover,the disease wasserious in the early sowing fields,whereas it declined in the late sowingfields.