随着我国简易日光温室和塑料大棚的大面积推广应用,在环境条件缺少人工有效控制的情况下,由于生产者技术和技能的限制,连作是经常性的。目前很多老的棚室出现了严重的连作障碍,表现为土传病害越来越严重。土传病害类病菌的细胞壁构成分两种:一种是纤维素,另一种是含几丁质和甲壳质的甲壳素类。藻菌类主要分解纤维素,甲壳素酶分解甲壳素。自然界的甲壳素广泛存在于甲壳动物(如虾、 With the large-scale popularization and application of simple solar greenhouse and plastic greenhouse in our country, under the condition of lack of artificial and effective control of environmental conditions, continuous production is frequent due to the limitation of producer’s technology and skills. At present, many old greenhouses have experienced serious continuous cropping obstacles, manifesting that soil-borne diseases are becoming more and more serious. Soil-borne diseases like bacteria cell wall composition in two ways: one is cellulose, the other is containing chitin and chitin chitin class. Algae bacteria mainly decompose cellulose, chitin enzyme decomposition of chitin. Chitin in nature is widely found in crustaceans (such as shrimp,