求翻译：自有人类栽培农作物历史以来，植物病、虫、草害无时无刻不制约着农产品的产量和品质，而品种抗病性的丧失、有害生物抗药性的产生、有害生物演替规律难以预料， 以及病虫防治要求作物遗传多样化和生产栽培、商贸加 要求的品种单一化的矛盾等技术问题一直未能解决，同时1部分已被控制的有害生物在放松防治或环境条件改变后又会回升，如大豆灰斑病从20世纪60,-~90年代的4次大流行，60年代火面积发生的小麦腥黑穗病是什么意思？

Has its own history of human cultivation of crops, plant diseases, insects and weeds all the time does not restrict the yield and quality of agricultural products, and the loss of disease resistance varieties, pest resistance to produce, difficult to predict pest succession laws, as well as disease

正在翻译，请等待...

Since the innate humanity has cultivated the crops history, the plant disease, the insect, the grass harm are constantly not restricting the agricultural product output and the quality, but the variety disease resistance loses, the harmful biological antibiotic production, the harmful biological suc

Owned human cultivation crop history yilai, plant disease, and insect, and grass damage all does not restricting with agricultural products of yield and quality, and varieties disease resistance sexual of lost, and harmful biological resistance of produced, and harmful biological speech for the law

Has its own history of human cultivation of crops, plant diseases, insects and weeds all the time does not restrict the yield and quality of agricultural products, and the loss of disease resistance varieties, pest resistance to produce, difficult to predict pest succession laws, as well as disease