在害虫防治上尽管我们作了许多工作,但是害虫危害似乎仍然有增无减。杀虫剂价格昂贵,并且常常给操作者、环境和消费者带来危险。使用化学农药不仅因害虫抗药性增强而发生更增猖獗,而且一些次要害虫还上升为主要害虫。防治害虫的另一种手段是生物防治,即利用天敌防治害虫。采用生物防治比较经济、安全和方便。生物防治在欧 Despite the many efforts we have made in the control of pests, the harmful effects of pests appear to be on the rise. Pesticides are expensive and often pose a danger to operators, the environment and consumers. The use of chemical pesticides is not only more rampant because of increased pest resistance, but also some minor pests also rise as major pests. Another means of pest control is biological control, that is, the use of natural enemies to control pests. Biological control is more economical, safe and convenient. Biological control in Europe