经田间试验证明：３２％爱福丁混剂可有效地防治梨壁虱（Ｅｐｉｔｒｉｍｅｒｕｓｐｙｒｉ）的为害。在３种施药浓度间无明显差异（Ｐ＞００５）。施药后１～７天内３２％爱福丁混剂略好于０９％爱福丁单剂和常规化学药剂１５％达螨灵，差异极显著（Ｐ＜００１），但在试验期间各时期与清水对照相比虫口减退率均达到Ｐ＜００１的极显著差异，故３２％爱福丁混剂经济有效的施药浓度为３５００倍液，校正防效为９９％～１００％，残效期在２８天以上。 The field trials showed that: 3 2% avermectin mixture can effectively prevent and control pear tick (Epitrimeruspyri) damage. No significant difference in the three kinds of application concentration (P> 0  05). 3 ~ 2% avermectin mixture was slightly better than 09% avermectin single dose and 15% conventional mite mite within 1 ~ 7 days after application, the difference was significant (P <001), but During the test period compared with the control group, the reduction rates of the population were all significantly different (P <001). Therefore, the effective concentration of 32% avermectin mixture was 3500 times, and the calibration effect was 99% ~ 100%, residual validity in more than 28 days.