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本文总结了历年稻瘟病发生概况和特点,对早晚稻穗瘟进行了预测预报的探讨,并着重讨论了未来稻瘟病的发生趋势。农村产业结构的调整,水稻种植面积的减少,经济作物面积的扩大,使早水轮作面积比例增加,有利于水稻生长,提高抗病力和减少病菌生长、繁殖的场所。春花田早稻面积扩大对早稻稻瘟病有避病作用。增施磷钾肥和配方施肥技术的应用,综合防治技术的进一步普及和深化有助于减轻稻瘟病的发生。以单季稻为先导和早晚稻抗病品种的推广,不但减轻稻瘟病的发生,而且加上病菌生理小种的变化,打破了在各季水稻和各地理区域上发病不平衡的格局。在经数年种植后,对病菌致病生理小种产生适应性,品种抗病性丧失,再加山区气候有
This article summarizes the general situation and characteristics of rice blast in the past years, discusses the prediction of morning and evening panicle blast, and focuses on the future trend of rice blast. The adjustment of industrial structure in rural areas, the reduction of rice acreage and the expansion of cash crop area will increase the proportion of early-flowering rotations, contributing to the growth of rice, improving disease resistance and reducing the growth and reproduction of germs. Increasing the area of early spring rice in spring flower field has the effect of avoiding the disease of early blast rice blast. The application of P and K fertilizer and formula fertilization technology, the further popularization and deepening of comprehensive prevention and treatment technology will help to reduce the occurrence of rice blast. The promotion of single-season rice as the leader and early and late-season disease-resistant varieties not only reduced the occurrence of rice blast, but also added the change of pathogenic races to break the disequilibrium pattern of rice and geographical regions in each season. After several years of planting, pathogenic races of pathogenic bacteria produce adaptability, disease resistance loss, plus the mountain climate