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美国是世界上生产柑橘最多的国家,也是生产农药较多的国家。可是美国橘农在柑橘上却很少用药,而柑橘长势健壮,株产也较高,其奥秘在哪里?我们在考察了美国的一些研究所、大学和橘园之后,了解到他们对柑橘很少喷药的秘诀在于:1.注重环境保护,狠抓生物防治喷药治虫要污染环境,危害人类身体。而所有的害虫,都有它的天敌。美国科学家为了保护环境,研究出利用有益生物防治
The United States is the country that produces the most citrus in the world and is also a country that produces more pesticides. However, American orange farmers seldom take drugs on citrus while citrus grows strong and its production is also high. Where are the mysteries? After examining some institutes, universities and orange groves in the United States, we learned that citrus is very Less spraying of the secret is: 1. Pay attention to environmental protection, pay close attention to biological control of pesticides to pollute the environment, endangering the human body. And all the pests, have its natural enemies. In order to protect the environment, American scientists have developed the use of beneficial biological control