2000年4月28日早晨,千余只螳螂的卵鞘被挂到北京天坛公园的海棠树上。个把月后,每只卵中就会有200只小螳螂爬出投入消灭蚜虫的战斗;再长大一些,它们就开始吃树上的毛毛虫。这些螳螂是天坛公园以虫治虫、生物治虫的绝招之一。天坛公园管理人员在病虫害防治时,发现使用化学药剂杀虫不仅使害虫有了抗药性,也损失了大批害虫天敌。经过多年的摸索,他们掌握了一整套有趣、有效的无污染治虫绝招儿,人称“海陆空式”的立 On the morning of April 28, 2000, more than a thousand praying mantis eggs were put on the crabapple tree in Beijing’s Tiantan Park. A few months later, each egg will have 200 small mantis crawling out fighting aphids fight; grow up, they began to eat the caterpillars of trees. These praying mantis is one of the unique tools for insect pest control and insect pest control in Tiantan Park. Tiantan Park managers in the prevention and treatment of pests and diseases, found that the use of chemical pesticides insecticide not only resistant, but also lost a large number of pests natural enemies. After years of exploration, they have mastered a set of interesting and effective non-polluting pest control trick, known as “land, sea and air” legislation