青蛙是有益动物,这是人所共知的,但能否利用它来防治农作物害虫却不大清楚。1975年,我们选择两亩晚稻田进行青蛙治虫效果对比试验。试验田一半放青蛙,一半未放青蛙,而是喷施化学农药,均系7月25日插秧。放蛙田四周筑有篱笆,以防青蛙逃散,篱笆内开有1.5尺深围沟,沟内放养水葫芦,以利青蛙活动。8月4日放虎纹蛙、黑斑蛙、金钱蛙、泽蛙共688只,在青蛙活动能力减弱后,于10月4日喷施一次化学农药防 It is well known that frogs are useful animals, but it is unclear whether they can be used to control crop pests. In 1975, we chose two acres of late paddy rice for insect control effect comparison test. Half of the experimental field put the frog, half did not put the frog, but spraying chemical pesticides, all on July 25 planting. Put frogs around the fence built to prevent frogs to escape, the fence opened with a 1.5-foot-deep ditch, furrowing water hyacinth to facilitate frog activities. On August 4, a total of 688 tiger frogs, black frogs, golden frogs and frogs were placed on the 4th of the 4th. After the ability of the frogs was weakened, a pesticide chemical pesticide was sprayed on October 4