田间小区试验表明：森草净１．０ｇ／亩在３０天内可有效控制梨园内杂草的危害，防效在８９％以上。药后６０天，防效下降到５５．３％～６１．４％，９０天时完全失去了土壤效应。２．０～３．０ｇ／亩可在９０天内完全控制住杂草的危害，防效都在９０％以上。森草净作茎叶处理时，对杂草株数无抑制作用，但对株高和鲜重有良好的抑制作用。１．０ｇ／亩用量下，对杂草株高和鲜重的抑制率在５０％以下，一个月后抑制作用消失；２．０～３．０ｇ／亩用量下，能在３个月内抑制杂草生长，抑制率达６０％～７０％。整个生长季节杂草的株高在１０ｃｍ以下。 Field plots showed that: Sencao net 1.0g / acre within 30 days can effectively control weeds in the pear orchard, the control effect of more than 89%. After 60 days of treatment, the control effect dropped to 55.3% -61.4%, completely losing the soil effect after 90 days. 2.0 ~ 3.0g / acre within 90 days can completely control the hazards of weeds, control effects are more than 90%. Simens grass net stems and leaves treatment, no effect on the number of weeds, but the plant height and fresh weight have a good inhibitory effect. Under 1.0g / mu, the inhibitory rate of weed height and fresh weight was less than 50%, and the inhibition disappeared after one month. Under the dosage of 2.0-3.0g / mu, it could be inhibited within 3 months Weeds growth, inhibition rate of 60% to 70%. Weeds throughout the growing season plant height of 10cm or less.