防治棉红蜘蛛药剂筛选及使用技术试验

试验表明，１０％浏阳霉素、２０％灭扫利、２０％三氯杀螨醇、２５％单甲醚、７３％克螨特对棉红蜘蛛成蛛毒力较高，ＬＣ＿（５０）均在１００μｇ·ｍＬ￣（１）以下，田间药效均在９０％以上，药效持续１０ｄ以上１４０％久效磷、５０％甲胺磷药效次之；而５０％乙基１６０５、４０％氧化乐果、４０％乐果毒力较低，田间防效较差，不宜在生产上继续应用。田间施药时稀释用水量可左右防效，棉花苗期以９００ｋｇ／ｈｍ￣２为宜，蕾期以后为１３５０ｋｇ／ｈｍ￣２．在药液中加１％尿素后喷施，可提高防效，促进棉株恢复生长，增产幅度１６．５％～２３．８％．

Effects of Several Insectkides on the Cotton Red Spider Mite and Their Application Methods

Elevencotton rod spider mite (Tetranychus cinnabarinus) insectieideswere tested both in labs and cotton fields in Shaanxi Province.The results showed that10% of Liuyangmycin,20% of Meothrin,20% of Kelthane,25% of Azaform,73% ofOmite,40% of Nuvacron and 50% of Monitor were all effective to the adult mites.Theireffects reached over 90% and lasted about ten days in the fields.50% of Alkron,40% ofFolimat and 40% of Rogor were effectiveless and not suitable to use on a large scale.Sprayed water quantity was also important in controlling the spider mites.900 kg/hm²was suitable at seedling stage and l,300 kg at cotton bud and boll stage.A combinationwith l% of Urea could promote the control effects and the retrieval of damaged plant.AS a result.the cotton yield could increase from 16.5% to 23.8%.