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唐山市乐亭县是河北省甜瓜生产面积最大的县份。甜瓜年种植面积达十多万亩。在甜瓜生产过程中,病虫害防治已经成为常规生产管理措施。但近些年,由于部分瓜农重视病害防治而轻视虫害防治,防治不及时田块则会不同程度上出现地下害虫的为害。2012年以来保护地甜瓜生产中新发生黄斑大蚊幼虫为害甜瓜幼苗的现象,并出现了加重趋势,雨水多的年份近水源地带个别
Laoting County, Tangshan City, Hebei Province, melon production area of the largest county. Melon planting area of more than ten million mu. In the melon production process, pest control has become a routine production management measures. However, in recent years, some peasants pay less attention to pest control because of their emphasis on disease prevention and control, and pest control is not timely in some fields. Since 2012, the occurrence of Melon larvae damage melon seedlings in melon production in protected areas has witnessed a trend of aggravating and rainy years.