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一九八一年至一九八二年,从十个县市、48个主要当家品种采集144标样。经过单胞分离培养,用全国统一方法,鉴定出我区稻瘟病菌有六群20个生理小种,其中ZC群出现频率55.12%,分布在10个县市,ZB群出现频率24.48%,分布在7个县市。稻瘟病是我区水稻主要病害之一。一九八一年全区穗颈瘟发生面积19万6千7百50亩,估计损失产量1703.4万斤;华安县仙都公社因红410发病成灾减产170万斤。为了摸清我区的稻瘟病生理小种分布情况,从一九八一年开始了这方面的研究工作,现将结果整理如下:
From 1981 to 1982, 144 standard samples were collected from 48 major ethnic varieties in 10 counties and cities. After single cell isolation and culture, a total of 20 physiological races of Magnaporthe grisea in our district were identified by a unified national method. The occurrence frequency of ZC group was 55.12%, distributed in 10 counties and cities, and the occurrence frequency of ZB group was 24.48% In 7 counties. Rice blast is one of the main diseases of rice in our region. In 1981, an area of 19,667,700 mu of panicle blast occurred in the entire region, with an estimated loss of production of 17,034 kilograms; the fairy community of Huaan County suffered a loss of 1.7 million kilograms as a result of the red 410 disease. In order to find out the distribution of physiological races of rice blast in our district, research work in this area was started in 1981 and the results are summarized as follows: