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1975年以来,在棉花品种抗蚜性试验中,根据尽快调查大量品种的需要,我们设计了蚜害指数调查法。把受棉蚜为害的棉株,根据蚜虫的有无和受害最重叶片的组织变化:正常,开始刍缩,半卷或全卷分为五级,统计各级株数,按照下式计算蚜害指数。蚜害指数=sum from (i1)to 4 n×i/ sum from (i0) to 4 n×4田间应用此法进行调查,由于不必数出或估计蚜量,可以大大节约检查时间。此法除了可以用来鉴定品种抗蚜性外,还可调查蚜害发展情况,以及进行序贯分析,确定药剂防治标准。不适于研究蚜虫种群数量动态。
Since 1975, we have designed a survey of aphid infestation based on the need to investigate a large number of varieties as soon as possible in the cotton aphid resistance test. The cotton aphid-affected cotton plant, according to the presence and absence of aphids and victimization of the most leaf tissue changes: normal, began to contract, half-roll or whole-coil is divided into five, the statistics of the number of strains, calculated according to the following formula index. Aphid damage index = sum from (i1) to 4 n × i / sum from (i0) to 4 n × 4 field survey using this method, as no need to count or estimate the amount of aphids, can greatly reduce the inspection time. In addition to this method can be used to identify varieties resistant to aphids, but also to investigate the development of pest damage, as well as sequential analysis to determine the standard of chemical control. Not suitable for studying aphid population dynamics.