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一、前言几年来在广东稻瘟病区現場調查观察中,发現品种間对稻瘟病感染的程度有明显的差异。在許多实例中,如1953年晚造(晚季稻)东莞县潢涌乡12,800亩稻田全面发病,因穗頸瘟損失在80%;以上的有600亩的流行情况下,同一块田种植“一粒种”的穗頸瘟率为1.5%,而“白壳齐眉”的穗頸瘟率为76.1%;1955年晚造南海(虫雷)崗区发病面积达11,850亩,其中損失50%者有350亩,20—30%者有2,500亩,10%者有9,000亩的流行情况
I. INTRODUCTION In the past few years in the field investigation and observation of the rice blast area in Guangdong Province, it was found that there was a significant difference in the degree of blast infection among the cultivars. In many cases, such as the late 1953 crop (late rice), 12,800 mu of paddy fields were fully affected in Huai Township, Dongguan County, due to the loss of panicle blast at 80%; in the case of over 600 mu, the same paddy field was planted “ A species of ”panicle neck blast rate of 1.5%, while“ white shell Qimai ”panicle blast rate of 76.1%; 1955 made the South China Sea (insect bile) ganglion area of 11,850 acres, of which 50% There are 350 acres, 20-30% have 2,500 acres, 10% have 9,000 acres of the epidemic