试验分别用砧木苗和嫁接苗做试材,按每亩沟施15%铁灭克颗粒剂1.5和2.0kg,对照药为50%辛硫磷乳油 1.5 kg.均兑水 100kg,另设空白对照,每小区 1畦(1畦5行),重复三次. 5月 5日开沟施药(沟深5cm),药后覆土,浇小水。以后每隔10天调查一次苹果黄蚜数量,秋冬起苗时调查中间3行苹果根绵 The experiment was carried out with rootstock seedlings and grafted seedlings as test material, applying 15% iron oxide granules 1.5 and 2.0kg per acre respectively, and control drug 50% phoxim EC 1.5 kg, all with water 100kg, and another blank control , Each district 1 畦 (1 畦 5 lines), repeated three times. May 5 Ditch drench (ditch depth 5cm), medicine Tucao, pouring water. After every 10 days to investigate the number of apple aphids, autumn and winter when the investigation of the middle 3 rows of apple root cotton