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目的观察农用地膜覆盖灭螺对土内钉螺和螺卵的影响。方法选择潮湿的有螺田埂作为试验现场,分设施药覆膜组(采用50%氯硝柳胺乙醇胺盐可湿性粉剂,按2 g/m2的剂量喷洒后覆盖地膜)、单纯覆膜组(不施药直接覆盖地膜)和对照组(不采取任何灭螺措施)。于施药覆膜后40 d和单纯覆膜后90 d分别对试验环境0、0~2、2~5、5~10和10~15 cm的土层进行钉螺调查。结果覆膜40 d和90 d后,钉螺在土内分布的特点发生了改变,钉螺由土表向土内深层呈逐渐递增趋势(R2=0.9877,R2=0.7619),土内钉螺死亡率高于对照组(χ2=281.198,P<0.001;χ2=47.970,P<0.001),活螺平均密度较对照组均有下降(Z=-6.390,P<0.001;Z=-4.681,P<0.001),幼螺的数量明显低于对照组(Z=-6.733,P<0.001;Z=-5.131,P<0.001)。结论地膜覆盖对土内钉螺有很好的杀灭作用,并且可抑制钉螺第2代的繁殖和孳生。
Objective To observe the effects of mulching with molluscicide on snail and spiro eggs in soil. Methods The wet snail was selected as the test site, and divided into two groups: 50% niclosamide ethanolamine salt wettable powder and 2 m / Application of drug directly cover the film) and control group (do not take any measures to kill snails). Snail surveys were conducted on the soil layers 0, 0-2, 2-5, 5-10 and 10-15 cm in the test environment 40 days after the filming and 90 days after the film alone. Results After 40 d and 90 d, the distribution of Oncomelania snails in the soil was changed. The value of Oncomelania snail increased gradually from soil surface to deep soil (R2 = 0.9877, R2 = 0.7619) The mean density of live snails in the control group (χ2 = 281.198, P <0.001; χ2 = 47.970, P <0.001) were lower than those in the control group (Z = -6.390, The number of baby snails was significantly lower than that of the control group (Z = -6.733, P <0.001; Z = -5.131, P <0.001). Conclusion Mulch mulching has a good killing effect on Oncomelania snail and inhibits the second generation of snail breeding and breeding.