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笔者从1982年开始,对杂交稻汕优二号和常规稻泸科三号,进行了纹枯病病情与产量损失关系的研究,现将结果简述如下: 方法: 1.病情观察:从移栽返青后开始每天普查发现中心病株后,定点每5天观察一次直至蜡熟期病情稳定时为止,调查记载病丛率、病株率、并按国际分级标准(后同)分级计算严重度和病情指数。 2.小区控制试验:采取接不同量纹枯病菌体诱发和不接菌并施药控制发病,造成不
The author from 1982, the hybrid rice Shanyou 2 and regular rice Luke 3, conducted a study on the relationship between disease severity and yield loss, the results are summarized as follows: 1. Disease observation: shift After returning to green, the census of the center was started daily. After the observation of the diseased plants at the center every 5 days till the condition of waxy period was stable, the rate of diseased plexus and diseased plants was recorded and graded according to the international grading standards And disease index. 2. Cell Control Test: take a different amount of Rhizoctonia solanacearum induction and not take bacteria and pesticide control the incidence, resulting in not