双甲脒等四种杀螨剂的药效对比试验

EXPERIMENT ON THE EFFECT OF FOUR ACARICIDES

用国产20%双甲脒乳油、螨克、20%三唑锡胶悬剂、20%三氯杀螨醇的不同浓度药液对元帅、新红星苹果树喷布,调查对苹果全爪螨和山楂叶螨的防治效果。结果表明:国产双甲脒和进口螨克对防治苹果两种叶螨均有特效。使用浓度1000～1500倍,有效控制期在30天以上,全年用药1～2次即可基本控制螨害。

The experiment shows that Amitraz and Mitac 20EC appticd in apple (Malus pumila) has a special effect preventing two spcies of leaf mites (Tetranychus viennensis Zacher and panonyehus ulmi Koch). If they are diluted with 1000～1500times of water, the effectivc control period will be longer than 30 days. If the above mentioned acaricides are used once or twicca year, leaf mitcs will be continUed effectively.