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沂南县北大山林场自一九七四年育赤眼蜂防治松毛虫,七年来,从年育蜂一百余卡一百二十万头,发展到年育蜂二十六万卡三十亿头。以赤眼蜂防治毛虫面积最初仅四亩现已扩大到一万三千余亩。还供应了临沂地区九个县十三个国营林场二万五千亩松林的用蜂和沂南县农业局、植保站、地区水稻站蜂卡2.9万张(大蜂卡)3540万头蜂。防治
Yinan County, North Dashan Forest Farm since October Trichogramma against Trichinella spiralis, seven years, from the year before the bee-breeding more than one hundred and twelve million 1.2 million heads, to develop a bee annual 260,000 card thirty Billion head. To Trichogramma control caterpillar area initially only four acres has now been expanded to more than 13,000 acres. We also supplied 23,400 bees (big bee cards) 35,400 bees with bee and Yinan County agriculture bureau, plant protection station and regional paddy station with 23,000 mu of pine forest in thirteen state-owned forest farms in nine counties of Linyi. Prevention and treatment