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菜粉蝶 Pieris rapae(Linnaeus)是我国十字花科蔬菜的重要害虫之一。近几年来,我们在预测预报中发现其越冬情况有了新的变化。为便于今后的预测预报工作,我们对其越冬虫态及越冬场所进行了调查分析.材料和方法1.1984年开始,每年年初在菜粉蝶越冬蛹羽化之前(1月),对我所座落在菜田中的一段围墙上的菜粉蝶越冬蛹进行调查。该段围墙长100米,高2米,东西向建筑,调查南北两侧各自的越冬蛹数量,并采回室内观察羽化情况。每年1、2月间,自田间越冬十字花科作
Pieris rapae (Linnaeus) is one of the important pests of cruciferous vegetables in China. In recent years, we have found new changes in its winter conditions in forecasting and forecasting. In order to facilitate the prediction and prediction in the future, we conducted a survey and analysis of its overwintering status and overwintering sites.Materials and Methods 1. Beginning in 1984, at the beginning of each year, before the pupae emerged overwintering (January) A section of Tanaka’s cabbage butterfly overwintering pupae were investigated. The section of the fence 100 meters long, 2 meters high, east-west building, north and south sides of the survey on the number of their own wintering pupae, and back to the indoor observation of eclosion. January and February each year, since the field over winter cruciferous