赤眼蜂、白僵菌防治苹果害虫的研究

研究表明，利用松毛虫赤跟蜂防治苹果小卷叶蛾、梨小食心虫；白僵菌处理地面．防治桃小食心虫的寄生效果，均可达90％左右，防治效果优于化学农药．赤眼蜂应掌握在害虫始卵期开始放蜂．5天1次，连放4次，每亩总放蜂量12万头．白僵菌应在桃小食心虫越冬代幼虫出土始盛期和盛期各防治1次，每次每亩用菌剂(100亿孢子／g)2kg．加25％对硫磷微胶囊剂0．15kg．兑水150kg，在树冠下地面喷洒．喷后覆草是提高防治效果的关键．

BIOLOGICAL CONTROL FOR THE APPLE INSECTS BY USING TRICHOGRAMMA DEEDROLIMI AND BEAUVERIA BASSIANA

The research results showed that by using Trichogramma dendrolimi to control the apple leaf-roller, Adoxopnyes orana and fruit borer,Grapholitha molesta;and Beauveria bassiana to control Carposina sasakii,the parasitizations were all up to about 90%.The ap- propriate time for releasing wasps was at the early duration of oviposition of the pests, continuously releasing 4 times at 5 days intervals with total 18,000 wasps per hect.The fungi agent was sprayed respectively at early and full peaks of migrating to the soil surface for the overwintered larvae of C.sasaki.The formulation was prepared by 2kg spore dusts(100 bil- lion spores per gram)mixed with 0.15kg parathion microcapsule,and then diluted 2,250kg per hect.The suspension was sprayed on the ground surface around the trunks of apple trees, then dry grass was covered,which was critical for obtaining an excellent affectiveness.