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近年来浙南各地的甘薯因甘薯小象鼻虫的为害,一般損失在10％左右,高的达到30％以上,严重地影响了甘薯的增产。現将以往在溫州地区对甘薯小象鼻虫的发生規律和防治方法的研究結果,重点介紹于后,以供参考。一、发生規律甘薯小象鼻虫在本省南部地区一年发生2-3代,世代叠置很不整齐。据室内飼养观察,第一代成虫发生期可从6月下旬直至10月上旬,7月最盛;第二代成虫发生期在8月上旬至10月下旬,8月中旬至9月中旬最盛;第三代成虫在9月下旬至10月仅有零星发生,以后卽蛰伏越冬。各代发育历期与气溫有关,气溫高发育快,反之則慢。除越冬代外,卵期为5～29天;幼虫
In recent years, sweet potatoes around southern Zhejiang sweet potato weevil damage, the general loss of about 10%, high up to 30%, seriously affected the sweet potato yield. Now in the past in Wenzhou area of sweet potato weevil occurrence law and prevention and control of the results of the study, focusing on the following, for reference. First, the occurrence of law Sweet potato weevil in the southern region of the province occurs 2-3 generations a year, generations stacked very neatly. According to indoor feeding observations, the first generation of adult occurrence period from late June until early October, the peak in July; second-generation adults occurred in early August to late October, mid-August to mid-September peak; The third generation of adults in late September to October only sporadic, after the dormant dormant wintering. The developmental history of each generation is related to the temperature, the rapid development of high temperature, and vice versa. In addition to wintering on behalf of, the egg period is 5 to 29 days; larvae