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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。
Humidity within the protected area is an important condition suitable for the incidence of conventional spray prevention and control to increase the shed humidity, control of the time by the cloudy and water restrictions, poor system control. The use of tobacco control greenhouse vegetable pests to make up for the lack of spray. At present, there are few varieties of tobacco smoke in our country, and the single smoke agent is easy to produce resistance in continuous use. Therefore, it is very necessary to develop a new type of smoke agent. From 1991 to 1996, the main cucumber downy mildew disease, Phytophthora nicotianae, a new type of tobacco smoke disease and tomato late blight. Each dose of 250g with 667m2. According to Tangshan, Qinhuangdao, Baoding, Langfang, Liaoning, Tianjin and other cities and 25 counties 5a test and 24,000 hm2 demonstration, prevention and control of more than 86%, the newly developed Phytophthora nicotinicus for the prevention and control greenhouse vegetable fungi New varieties have been added to sex and bacterial diseases.