疫霉净烟剂防治保护地蔬菜几种病害的研究

The Preliminary Studies on YIMEIJING Smoke Agent Controlling Cucumber Downy Mildew, Angular Leaf Spot and Tomato Late Blight in Greenhouse

保护地内高湿是适宜发病的重要条件，常规喷雾防治增加棚内湿度，防治时间受阴天和浇水限制，系统防效差。采用烟剂防治温棚蔬菜病虫害弥补了喷雾之不足。目前我国烟剂品种少，单一的烟剂连续使用易产生抗性，为此研制新型烟剂非常必要，通过1991-1996年的研究，研制出了主防黄瓜霜霉病，黄瓜细菌性角斑病和番茄晚疫病的新型烟剂疫霉净烟剂。每667m2用剂量250g。据唐山、秦皇岛、保定、廊坊、辽宁、天津等地市和25个县区5a试验和2.4万hm2示范，防治效果达86％以上，新研制的疫霉净烟剂，为防治温棚蔬菜真菌性和细菌病害增添了新品种。

It's well known that higher humidity in the green house is the important condition to cause plant diseases. Conventional spraying methods could prevent the problem of humidity in the tent but its systemetic controlling effect was not ideal since this was dramatically restricted by the factors as time, cloudy weather and irrigation. While smoke agent could make up for the weakness of spraying in controlling vegetable diseases and insect pests in green house, it is necessary at present to develop new variety of smoke agent since we are lack of varieties now and drug resistance couldn' t be avoided if it is used too long. From 1991 - 1996, YIMEIJING, a new kind of smoke agent which could cure and prevent cucumber downy mildew, cucumber angular leaf spot and tomato late blight, was developed in our institute. The suitable dosage for 1 mu is only 250g. Its control effect amounted over 86%, according to the tested result from 25 cities during the period as Tangshan, Qinhuangdao, Baoding, Langfang, Liaoning, Tianjin as well as that of 35, 500 mu in green house. It's better than chorothalonil smoke agent because Yimeijing could be applied to control cucumber angular leaf spot, which fills up the gap that there is no smoke agent for controlling vegetable bacterial diseases. Moreover, it is especially of high quality in controlling vegetable diseases in green house.