玉米病毒病被称为“玉米癌症”,是当今国内外难以攻克的“绝症”之一。在我国,病毒病的种类主要有粗缩病和矮花叶病两种,在大多数玉米主产区两病混合发生。 (一)玉米病毒病的特点 首先,病毒病的发生来势猛,上升速度快,发病面积大,危害严重。有的地区前一年只有零星病害发生,而次年就呈大发生态势,每667平方米(1亩)病株率从百分之十几到百分之八九十不等,有些地块甚至毁 Corn virus disease is called “corn cancer” and is one of the “incurable diseases” that is hard to overcome at home and abroad today. In our country, the main types of virus diseases are both cucumbers and dwarf mosaic diseases, which occur in most maize producing areas. (A) the characteristics of the corn virus disease First of all, the occurrence of viral disease is fierce, rising speed, the incidence of large area, endangering serious. In some areas, only sporadic diseases took place in the previous year, while the following year there was a big trend. The rate of diseased plants per 667 square meters (1 mu) ranged from 10% to 80% and some plots Even destroyed