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近几年来,大豆丝核菌病 Pelliculariasasakii(Shirai)Ito。在我县发生危害愈来愈重,致使植株落叶枯死,豆粒腐烂,影响大豆的产量和品质。为了弄清丝核菌病的空间分布型,探讨合理的调查取样方法,笔者于1984年10月,晚大豆处于鼓粒期(病害已基本定局),在店下村选择了五块发病程度不一,并有代表性的晚大豆田(品种为本地黄豆),进行该项调查和测定,现将其结果简述如下:一、空间分布型的测定1.方法:在每块豆田中,划出40×50丛的方块,逐丛逐株进行调查,记载病丛数和
In recent years, soybean Rhizoctonia Pelliculariasasakii (Shirai) Ito. In our county more and more serious damage, resulting in dead leaves decay, bean decay, affecting soybean yield and quality. In order to understand the spatial distribution of Rhizoctonia so as to explore a reasonable method of investigation and sampling, in late October 1984, the late soybean was in the stage of druming (the disease has been basically established), and five different diseases were selected in Dianxia Village , And a representative late soybean field (varieties of local soybean), the survey and determination, the results are summarized as follows: First, the determination of spatial distribution 1. Method: In each bean field, draw 40 × 50 plexus block, by cluster investigation by strain, record the number of disease and cluster