【摘要】 <正> 菱角(Trapa natans L.)、莼荣(Brasenia schreberi Gmel.)是苏、浙、鲁、皖、湘、赣等省河网地区的重要水生经济作物,也是出口农产品。据调查,近年菱角萤叶甲(Galerucella birmanica.Jacoby)为害严重,如1981年江苏高邮县汤庄公社受害面积达72%,减产60%以上,杭州毛家埠、苏州东山等地,因该虫为害,莼菜产量每况愈下。菱角萤叶甲的生物学习性侯子艾等曾有过报道,但在种群动态、生态学特性及综合防治等方面国内外研究颇少,为了综合开发水面资源,发展水生经济作物,我们于1981—1983年对菱角萤叶甲进行了研究。更多还原

【Abstract】 Waterchesthut beetle (Galerucella birmanica Jacoby) is one of the most important insects damaging the waterehestnut (Trapa natans L.) and atershield (Brasenia schrebori Gruel.) in Jiangsu Province. It has seven generations each year in insectary and overlapped generations in the field. The beetle overwinters in the form of diapause adult in the residues of the water crops (e, g. water bamboo etc.) or in the soil slits. In early May the adult begins to migrate from overwintering places to the leaves of the waterchestnut.Under constant temperature condtion,13.8℃ is the threshold temperature for its development with an effective temperature summation of 278.5 day-degree. In nature the population of the beetle fluctuates closely with the amount of rain-fall and the temperature condition in July and August.The following control measures may be adopted: (1) In May and June spray with Cartap and Desic when the larvae are young; (2) Clean away the residues of water plants and weeds near the shore in order to destroy the beetle’s overwintering sites condition.更多还原