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防治萍虫是红萍全年放养成败的关键,萍螟是红萍的主要害虫之一。1974年三华大队在大面积应用春萍的基础上,又积极摸索夏季红萍的放养技术。全队越夏红萍70多亩,但在放养过程中常遇到萍虫的威胁,特别是6-9月间往往因萍螟为害而造成大面积倒萍。为了消灭萍螟,确保红萍的安全越夏度秋,我们观察了萍螟的世代历期、生物学特性及进行药剂防治试验,现将初步结果整理如下。一、萍螟的世代及虫态历期在8～11月间,我们用单个和群体饲养与室外定点系统调查相结合的方法,进行了两个世代的观察。室内用直径10厘米、高10厘米的玻璃缸,内装浅水,放入无虫红萍,然后接
Prevention and control of Ping-ping is the key to the success or failure of Hongping stocking, Ping borer is one of Hongping’s main pests. In 1974, based on the large area of Chunping, Sanhua Brigade actively explored the summer stocking techniques of Hongping. The team Xia Xiaoping more than 70 acres, but in the stocking process often encountered the threat of Ping insects, especially from June to September is often due to the stem borer damage caused by large area inverted Ping. In order to eliminate Pingqin borer, to ensure the safety of red sandalwood more summer, we observed the history of Pinggui generations, biological characteristics and chemical control experiments, the preliminary results are summarized below. First, the stem borer generations and the worm state in the period from August to November, we use single and group feeding and outdoor fixed-point system to investigate a combination of methods for two generations of observations. Indoor diameter of 10 cm, 10 cm high glass tank, built-in shallow water, into the worm-free red duckweed, and then