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目的观察4%强螺杀粉剂在现场大面积江滩地区的杀螺效果。方法在扬州市邗江区沿江有螺滩地用50g/m24%强螺杀粉剂和2g/m250%氯硝柳胺乙醇胺盐可湿性粉剂,分别在清障与不清障环境下进行喷粉和喷洒法灭螺,并于施药后3、7、15d和12个月,分别观察滩地钉螺死亡情况和活螺密度。结果在清障环境下,灭螺后3、7d和15d的近期杀螺效果,除3d喷洒法杀螺率高于喷粉法外(χ23d=4.6822,P<0.05),7d和15d杀螺率差异均无统计学意义(χ72d=0.0426,χ125d=0.6247,P均>0.05);在未清障环境下,3、7d和15d喷粉法杀螺率显著高于喷洒法(χ32d=4.8456,χ72d=3.8786,χ125d=4.6010,P均<0.05)。但两药12个月后无论清障或未清障,滩地除活螺密度降低外,其杀螺率与近期效果相比均呈现下降趋势。结论4%强螺杀粉剂的近远期杀螺效果好于50%氯硝柳胺乙醇胺盐可湿性粉剂,适宜远离水源江滩和大面积滩地灭螺。
Objective To observe the effect of 4% prednisolone on the snail killing in a large area of the river beach area. Methods In the Hanjiang River area of Yangzhou City, there is a conch bank with 50g / m24% spiroxetine and 2g / m250% niclosamide ethanolamine salt wettable powder, respectively, in the clearance and unclear barrier environment spray and spray method The snails were killed at 3, 7, 15d and 12 months after spraying, respectively. The deaths and live lobed density were observed. Results The results showed that the killing rate of snail on 3, 7 and 15 days after the snail elimination was higher than that on the 3rd and 7th day (χ23d = 4.6822, P <0.05) (Χ2d = 0.0426, χ125d = 0.6247, P> 0.05). Under the unbroken condition, the kill rates at 3 days, 7 days and 15 days were significantly higher than those of spraying methods (χ32d = 4.8456, χ72d = 3.8786, χ125d = 4.6010, P <0.05). However, after two months of treatment, both the failure rate and the failure rate of the two drugs decreased except for the live spiral density, and the rate of snail killing showed a downward trend compared with the recent results. Conclusion 4% prednisolone short-term long-term snail control effect is better than 50% niclosamide ethanolamine salt wettable powder, suitable for far away from the waterfront and a large area of beach flood snail.