所谓生物防治,就是利用有益生物或生物的代谢物来控制或减轻农作物病、虫、草害。当前,在化学农药严重污染、害虫不断产生抗病性之际,积极推广和应用生物防治,对促进农业生产发展和提高经济效益,有着重要的现实意义。 以虫治虫:目前,利用有益的昆虫消灭有害昆虫的应用较广,效果也很显著。如我国很多地方采用人工繁殖赤眼蜂,然后释放到家田、果园、林区等,对梨小食心虫、苹果小卷叶蛾、稻纵卷叶螟、玉米螟、甘蓝夜蛾及大豆食心虫等,以及林业上的松毛虫等多种害虫都有良好的控制作用,取得了满意的防治效果。 美国科学家发现用死虫防治害虫效果良好。方法是:从田间捕捉或收捡僵死的菜青虫50克,捣碎让其腐烂,加水10毫升, The so-called biological control, is the use of beneficial organisms or biological metabolites to control or reduce crop diseases, insects, grass damage. At present, when chemical pesticides are seriously polluted and pests continue to produce disease resistance, the active promotion and application of biological control has an important practical significance for promoting the development of agricultural production and increasing the economic benefits. Insect pests: At present, the use of beneficial insects to eliminate harmful insects wider application, the effect is also very significant. For example, in our country, Artificial Trichogramma was artificially propagated, and then released to Jiatian, Orchard, Forests and so on. On the pine caterpillars and other pests have a good control effect, and achieved satisfactory control effect. American scientists found that the use of dead insects pest control effect is good. The method is: catch or pick up from the field zombie Pieris 50 grams, mashed let it rot, add water 10 ml,