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一、病情调查和计算方法 小麦赤霉病(穗腐)的为害程度,一般用病穗率、病穗严重度及病粒率三者表示。由于病粒率与病穗率及严重度有相关性,而田间对病粒率不易进行调查,故可只用病穗率及严重度表示为害程度。为了便于综合比较,可将病穗率及严重度合并计算为病情指数,以代表某一调查对象的受害程度。 1.病穗率:赤霉病的发病程度与麦株生育期的关系十分密切。由于肥力、地势等因素使麦株长势和抽穗开花先后有不同,而形成同一田内,不同
First, the disease investigation and calculation methods Fusarium head blight (ear rot) of the degree of damage, the general use of disease panicle disease, panicle disease severity and disease rate of three. As the rate of diseased grains is related to the rate and severity of disease, and the rate of diseased grains is not easy to measure in the field, it can be used to indicate the degree of harm only by the rate and severity of diseased grains. In order to facilitate an overall comparison, the disease rate and severity can be combined as a disease index to represent the degree of victimization of a surveyed. 1. Disease panicle rate: the incidence of scab and wheat plant growth period is very close. Due to fertility, topography and other factors make wheat growth and heading have different flowers, and the formation of the same field, different