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近几年,广大农民种植西瓜的面积不断增加,随之西瓜枯萎病也逐年加重,威胁着西瓜的稳产高产。据调查,1988年我市西瓜枯萎病发病率为4.5%,而1990年上升为18.2%,瓜农为了控制危害,不断增加化学农药的使用量和打药次数,甚至还使用剧毒和高残留的农药,使西瓜和土壤中的农药残留越来越高,造成了环境污染,直接影响城乡人民的身体健康。为了保护环境和人民的身体健康,我市优先选用生物农药,并通过1990～1992三年试验
In recent years, the majority of peasants growing watermelon area continues to increase, along with watermelon blight also increased year by year, threatening the steady and high yield of watermelon. According to the survey, in 1988, the incidence of watermelon wilt in our city was 4.5%, while that in 1990 rose to 18.2%. In order to control the harm, melon farmers continuously increased the use of chemical pesticides and the number of pesticides used, and even used highly toxic and highly pesticide residues So that pesticide residues in watermelons and soil are getting higher and higher, causing environmental pollution and directly affecting the health of urban and rural people. In order to protect the environment and the health of the people, our city gives priority to the use of biological pesticides and passed the three-year trial from 1990 to 1992