稻瘿蚊在玉林地区发生为害历史很长,过去多局限在山区和丘陵地带发生。自80年代以来,随着施肥水平提高,新品种大面积推广,稻瘿蚊已从局部性变成大面积发生,从间歇性发生变为常发性发生。从1988年以来,每年发生都在120万亩以上,占晚稻种植面积的30%左右。1988年全地区发生175.2万亩,损失稻谷43 678吨。此虫在本地以幼虫在蓉草或再生稻上越冬。一年可发生8个世代,世代重叠。以7月上中旬开始的第四代到9月中、下旬的第六代,这3个世代为主害代。据调查,水稻受害 Rice gall midge in Yulin area has a long history of harm, in the past more limited in the mountains and hilly areas occur. Since the 1980s, with the improvement of fertilization level and popularization of new varieties, rice gall midge has changed from localized to large area and from intermittent to recurrent. Since 1988, the annual occurrence has been above 1.2 million mu, accounting for about 30% of the rice planted area. In the whole area of ​​1988, 1.752 million mu occurred, with a loss of 43 678 tons of paddy. The worm locally larvae in the grass or ratoon overwinter. Eight generations can occur a year, generations overlap. From the fourth generation in mid-July to the sixth generation in mid-to-late September, these three generations are the main victims. According to the survey, rice victims