自从有了农业生产,病、虫就开始危害着它,这是因为农业生产出现之前,已经有了病害和虫害。昆虫是现有地球上与人类争夺粮食最激烈的动物,昆虫危害引起谷物欠收而导致饥荒的事情在世界上层出不穷;而且在农业虫害猖獗时往往会伴生病害的迅速、大面积发生,比如小麦的黄矮病病毒,就是在昆虫刺吸植物(小麦)时,进入小麦体内使小麦发病的。因此,防治虫害的现实意义比病害的防治更为重大。 Since the beginning of agricultural production, disease and insects have begun to endanger it. This is because diseases and pests have already existed before the advent of agricultural production. Insects are the most extinct animals in the world that compete with humans for human beings. Insects cause the famine caused by the lack of grain in the world. And they are often accompanied by rapid and large-scale occurrence of diseases such as wheat Of the yellow dwarf virus, is in the insect sucking plants (wheat), the wheat into the body so that the incidence of wheat. Therefore, the practical significance of pest control is more serious than the prevention and treatment of diseases.