播期和密度对小麦纹枯病发病程度的影响

研究了播期、密度对小麦纹枯病发病程度的影响。结果表明:播期早、播种密度大和氮肥用量高是纹枯病发生程度加重的主要原因。冬前和播种-拔节期积温多,拔节前后气温低,纹枯病病情指数高。生产上要选用抗、耐病品种,适期播种或适期晚播,推广精量半精量播种,控制群体密度,增强个体自身的抗病力;根据田间调查情况,适时进行化学防治。

Effect of Sowing Time and Density to Wheat Banded Sclerotial Blight Morbidity Degree

The effect of sowing time and density to wheat banded sclerotial blight morbidity degree was studied.The results showed that early sowing,big sowing density and high nitrogenous fertilizer were the primary reasons on aggravating the degree of banded sclerotial blight morbidity.Accumulated temperature were many before the winter and the sowing seeds-jointing stage,while the temperature was low around the jointing,which led the banded sclerotial blight disease index to high.In production,what people should do was selecting resistant or tolerant cultivars,sowing seeds in suitable time or in suitable late time,spreading fine quantity or half fine quantity sowing seeds,controlling the community density,enhancing individual own resistance to disease,carring on chemistry preventing and controlling at the right time according to the field investigation situation.