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我区稻瘟病常年发病面积22.89万亩。占稻作复种面积的5.86％。大流行的一九七八、一九八○两年均达40万亩以上,占复种面积的12％左右,每年因此病损失稻谷400～1200万斤。弄清影响我区稻瘟病流行的因素,积极采取相应有力的防治措施,减轻、控制其为害,是当前提高稻作产量的一大课题。一、影响稻瘟病流行的因素:影响我区稻瘟病流行的因素是多方面的,在菌源大量存在的情况下,品种抗病性强弱是内因。肥水管理当否是外因。气候影响是关键。1.品种对病害的影响:一九七○年大面积改制以来,我区水稻品种的抗病性有弱、强、弱,和发病重、轻、重三个阶段。一九七二年以前。双早品种繁多,单、双晚品种单一或较缺。双早主要有矮南早1号、
The annual area of blast in our county is 228,900 mu. Accounting for 5.86% of rice multiplication area. The pandemic reached more than 400,000 mu in 1978 and 1802, accounting for about 12% of the area planted with multiple crops, thus resulting in an annual loss of 400-12 million kg of paddy. To clarify the factors that affect the epidemic of rice blast in our district and actively take appropriate and effective prevention and control measures to reduce and control their damage is a major issue for raising the output of rice production. First, the factors that affect the prevalence of rice blast: the factors that affect the prevalence of rice blast in our area are many, in the presence of a large number of bacterial sources, the strength of the disease resistance is the internal cause. Fertilizer and water management is the external cause. Climate impact is the key. 1. Varieties on the impact of disease: Since the 1970 large-scale restructuring, the resistance of rice varieties in our region are weak, strong, weak, and the incidence of heavy, light and heavy three stages. Before 1972. Double early variety, single and double night varieties single or lacking. As early as two short morning south as early as No. 1,