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两年来,我们在草蛉的饲养和田间释放等方面,进行了一些观察,获得了初步的结果。 一、草蛉的发生概况 我县地处黄海之滨,气候温和多湿,果林及粮棉作物布局复杂,害虫种类较多,为草蛉的自然繁殖提供了有利条件。初步调查,草蛉的全年发生数量以小草蛉为主,以大草蛉发生最早,3月下旬即见于春花作物,4月中、下旬数量激增,约占当时两种草蛉总量90％以上。小草蛉常年始见于4月中旬,7月上旬起在棉田内才占绝对优势。10月中旬后,棉叶衰老,食料不足,相继迁飞至蔬菜地。
In the past two years, we have made some observations regarding the feeding of shrews and field release, and obtained preliminary results. First, the incidence of grassland is located in the county is located in the Yellow Sea coast, the climate is mild and humid, fruit trees and cotton crop complex layout, pests species more, for the natural breeding of the grass has provided favorable conditions. According to the preliminary investigation, the number of the annual occurrence of the weeds is mainly dominated by small grass weeds, the earliest occurs as the large weeds, and the spring flowers appear in late March. The number of grass in mid-April surges sharply, accounting for about 90% the above. Small grass 蛉 perennial began in mid-April, beginning in early July in the cotton field only an absolute advantage. After mid-October, the senescence of cotton leaves, lack of food, have moved to vegetable land.