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近年来,由于建设规模的扩大,荒田面积不断增加,加上有机氯农药被取代,一度曾消声匿迹的稻蝗在我区回升,危害面积不断扩大,危害程度逐年增加。据调查统计,我区稻蝗发生面积700公顷左右,约占水稻面积的6%,其分布几乎遍及全区。据1995年调查,发生密度平均为每米~25只,严重田块每米~2达20只,失治田块每公顷损失稻谷375～750公斤,且发生危害逞逐年扩展加重之势。为防治稻蝗的危害,1994年开始我们对稻蝗的发生规律及防治技术进行了研究,现将研究结果初报如下。
In recent years, due to the expansion of construction scale, the continuous increase of wasteland area and the replacement of organochlorine pesticides, the locust locust once disappeared disappeared in our district, the harm area has been continuously expanded and the degree of harm increased year by year. According to the survey statistics, the occurrence area of rice grasshopper in our area is about 700 hectares, accounting for about 6% of the rice area. Its distribution covers almost the whole area. According to the survey in 1995, the average density was 25 per meter, and the number of serious plots was 20 per meter. The loss of paddy field was 375-750 kilograms per hectare of paddy, and the occurrence of harm was exacerbated year by year. In order to prevent the harm of rice locust, we started to study the law of occurrence and control of rice locust in 1994, and the results are as follows.