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褐飞虱Nilaparvata lugens Stal是本地区后季稻的主要害虫,每年8月初后季稻移栽返青后迁入田内并繁殖两代。不同年度间后季稻田褐飞虱密度差异悬殊,分析其各代有关发育阶段密度变动的特点及主要原因,对预测发生量和制定合理的防治策略,显然十分必要。本文根据南陵县测报站1976—1982年田间调查资料试作以下探讨。 一、田间调查及数据处理 1.田间调查方法 1976—1982年在我站观察区内,每年选一块中期(7月下旬)栽插的后季稻田,品种为农垦58。从水稻返青起每4—5天查一次虫量。调查时将稻飞虱拍入白瓷面盆目测虫数,分类记载。根
Nilaparvata lugens Stal is the main pest of the post-season rice in this region. After the autumn rice is planted in early August, it is transferred to the field and replanted for two generations after being transplanted. The difference in density of brown planthopper in the post-season paddy fields in different years is very different. It is necessary to analyze the characteristics and main causes of the density changes during the developmental stages in each generation. It is obviously necessary to forecast the amount of occurrence and to formulate a reasonable control strategy. This article tries to make the following discussion based on the field survey data from 1976 to 1982 in Nanling County. I. Field investigation and data processing 1. Method of field investigation During 1976-1982, in the observation area of our station, a piece of latter-season paddy field planted mid-term (late July) was planted each year. The cultivar was Nongken 58. Green rice from the check every 4-5 days once the amount of insects. During the investigation, the rice planthoppers were photographed in white porcelain basin for visual inspection, and classified records were recorded. root