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穗稻瘟俗称白穗,使稻穗发白变秕,严重影响产量,是水稻主要病害之一。穗稻瘟又分为稻颈瘟、枝梗瘟和谷粒瘟。穗颈瘟使整个稻穗变白,损失几乎100%;而枝梗瘟和谷粒瘟只造成穗的一部分变白,损失穗的一部分。在对发病程度调查时,用病穗率这一指标显然不能反映实际发病程度。农业部农作物病虫测报总站编辑出版的《农作物主要病虫测报办法》一书上介绍的穗瘟病情程度分级及病情指数(以下简称病指),是最常用的调查指标,基本
Spike rice blast commonly known as white spike, so that the rice panicles change, seriously affecting the yield, is one of the major diseases of rice. Panicle blast is divided into rice neck blast, branch stem blast and grain blast. Panicle blast causes the entire panicle to become white, losing almost 100% of the total panicles; whereas the branch stems and grain blast cause only part of the panicles to become white, losing part of the panicle. In the investigation of the degree of illness, the index of diseased spikes apparently can not reflect the actual incidence. The classification of the panicle severity and the disease index (hereinafter referred to as the disease index) introduced by the Ministry of Agriculture’s Crop Disease and Pest Report Terminal compiled and published in the Measures for the Report of Main Diseases and Pests of Crops is the most commonly used indicator for investigation. The basic