氯硝柳胺稻田浸杀灭螺不同施药方式的灭螺效果

Effect of Different Ways to Control Snails With Niclosamide in Rice Field

目的观察氯硝柳胺稻田浸杀灭螺不同施药方式的灭螺效果。方法选择6处稻田,以50%氯硝柳胺乙醇胺盐可湿性粉剂浸杀量2g/m2,采用撒粉、喷洒、泼洒3种施药方式,灭螺后不同时间比较3种施药方式的灭螺效果和操作繁简。结果灭螺后7d钉螺3种施药方式的钉螺死亡率为91.97%～96.15%之间,平均活螺密度由灭前的8.12只/m2下降到0.51只/m2,降幅93.71%,撒粉法的钉螺死亡率和活螺密度降幅略高于喷洒法和泼洒法,差异无统计学意义(P>0.05)。撒粉、喷洒、泼洒3法的劳动力成本比例为1∶2∶3。结论氯硝柳胺浸杀灭螺剂量2g/m2稻田浸杀灭螺效果好,撒粉施药方式具有操作简便,不需要特殊器具,省工省时等优点,建议现场稻田浸杀灭螺中推广使用撒粉法施药。

Objective To observe the effect of different ways to control snails with niclosamide in rice field. Methods Six places of rice fields were selected and wettable powder of 50% niclosamide salt with a dose of 2 g/m2 were delivered through three ways： powder dusting, spraying and splashing; the effects and practicali- ty of the three ways were compared. Results The death rates of snails of the three ways ranged within 91.97% - 96. 15% seven days after using pesticide; the average snail density decreased from 8. 12/m2 to O. 51/m2, with a decreasing amplitude of 93.71%. The death rate and decreasing amplitude of live snail for powder dusting were slightly higher than the other two methods, yet with no statistical difference （P 〉 0. 05 ）. The ratio of labor costs for powder dusting, spraying and splashing was 1 ： 2 ： 3. Conclusion The effect of niclosamide with a dose of 2 g/m 2 in rice field is good, and due to its simple handling and time and labor saving, the powder dusting method is thus recommended for snail control in rice field.