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近年来,拉萨市区蔬菜栽培面积不断扩大,温室、特别是塑料大棚发展迅速、为增加蔬菜品种,提高蔬菜产量、解决城乡人民生活中对蔬菜的需求问题发挥了很大作用。但由于在有限的土地上增加了复种指数、提高了施肥灌水水平,加之同种蔬菜的连作和盲目的引种等原因,蔬菜病害的种类越来越多,为害越来越重。有些原来为害轻微的病害现在加重了为害,有些原来没有的病害,如茄子、辣椒的菌核病,现在不但普遍发生,而且已开始严重影响到产量和品质。
In recent years, the vegetable cultivation area in Lhasa has been continuously expanded. Greenhouses, especially plastic greenhouses, have developed rapidly. They have played a significant role in increasing the variety of vegetables, increasing the output of vegetables, and solving the demand for vegetables in urban and rural areas. However, due to the increase of multiple cropping index on limited land, increasing the level of fertilization and irrigation, coupled with continuous cropping of the same kind of vegetables and blind introduction, the variety of vegetable diseases is more and more harmful. Some diseases that were originally minor were now aggravated. Some diseases that did not exist, such as eggplant and chili pepper scab, are now not only common but have begun to seriously affect the yield and quality.