通过对冀东冬小麦根腐病的初侵染来源进行研究 ,结果表明 :冀东地区冬小麦根腐病的初侵染来源主要是种子带菌和土壤带菌 ,田间病残体和杂草也是比较重要的初侵染来源。通过对不同轮作形式的麦田土壤的病菌数量进行系统测定 ,结果表明 :小麦不同生长期 ,土壤中根腐病菌数量不同 ,小麦播种前土壤中病菌含量低 ,乳熟期病菌含量最高。小麦—玉米—小麦轮作形式下 ,土壤中病菌含量较高 The primary sources of winter wheat root rot in Jidong were studied. The results showed that the primary sources of winter wheat root rot in Jidong were mainly seed-borne and soil-borne, and the field sick and weeds were also important Origin of primary infection. The results showed that there were different numbers of root rot pathogens in soil at different growth stages, the content of germs in soil before sowing was low, and the content of germs in milk ripening stage was the highest. Under the form of wheat-corn-wheat rotation, soil bacteria content is higher