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我区是稻瘟病的老窝子。推广抗病良种已成为综合防治的主要内容。但近十余年来,一些抗病良种经栽种几年后都相继丧失了抗病性。已有的研究表明稻瘟病菌存在着不同的生理小种;小种变化是导致品种抗性丧失的重要原因,而品种改变又会影响小种区系的组成。所以,探明我区稻瘟病菌的小种类型、区系分布和消长规律,对水稻抗病育种和病害流行预测及防治,都有着十分重要的现实意义。为此,从1979年起,开展了这方面的试验研究。
My area is the old blast of rice blast. Popularizing disease-resistant varieties has become the main content of comprehensive prevention and control. However, in the past decade or so, some resistant varieties have lost their disease resistance several years after they were planted. Previous studies have shown that there are different physiological races of Magnaporthe grisea; racial changes are the important reasons leading to the loss of resistance of varieties, and the variety will affect the composition of races. Therefore, it is of great practical significance to find out the races of races of Magnaporthe grisea in our district, their distribution and growth and their rules of decline and growth, and to forecast and control the epidemic of disease-resistant breeding and disease in rice. To this end, since 1979, carried out in this area experimental study.