这是一篇科普说明文,主要讲了两方面知识,一是病菌对农作物的侵入和破坏,以及作物不同程度的防御、抵抗病菌的能力;一是如何利用作物本身的抗病能力培育出抗病能力特别强的作物品种.这两种知识是一个问题的有密切联系的两个方面.我国现阶段还是一个以农业生产为主的国家.为了农业丰收,提高农作物的产量当然是农业科学工作者首要的研究工作;而提高作物的产量,防止作物病虫害又是这项研究工作中的关键.虫害和病害 This is a science description, mainly about two aspects of knowledge, one is the germs on the invasion and destruction of crops, as well as crops to varying degrees of defense, the ability to resist bacteria; one is how to use the crop’s disease resistance to develop disease resistance The ability of particularly strong crop varieties of these two kinds of knowledge is a problem is closely linked to two aspects of our country is still a predominantly agricultural production countries in order to bumper harvests and improve the yield of crops is of course the agricultural science workers The primary research work; and to improve crop yield, prevent crop pests and diseases is the key to this research. Pests and diseases