Levot G W, Barchia I
Biological and Chemical Research Institute, NSW Agriculture, Rydalmere.
Aust Vet J. 1995 Jul;72(7):245-8. doi: 10.1111/j.1751-0813.1995.tb03536.x.
Resistance to organophosphorus (OP) insecticides in the Australian sheep blowfly has decreased the larvicidal effectiveness of several popular products used as dressings for flystrike. Laboratory bioassays in which near full-size Australian sheep blowfly larvae were immersed in flystrike dressings at registered concentrations for times ranging from 5 to 180 s indicated that none of the products was completely effective in killing highly OP-resistant larvae. Several products performed poorly, even against a susceptible population. Effectiveness did not always reflect the concentration of active ingredient. For example, the products considered to be the most, and least effective overall, contained 0.036% propetamphos but were formulated very differently. Larvicidal efficacy is important in terms of minimising injury to stock but also in the management of insecticide resistance. In situations when the degree of resistance is known, it will be possible to make recommendations for the most cost-effective treatment of flystrike. In the meantime, there appears to be a clear advantage for woolgrowers to use a propetamphos-based flystrike jetting product to dress flystrike lesions.
澳大利亚绵羊绿蝇对有机磷（OP）杀虫剂产生抗性，降低了几种用作蝇蛆病敷料的常用产品的杀幼虫效果。在实验室生物测定中，将近成熟的澳大利亚绵羊绿蝇幼虫以登记浓度浸泡在蝇蛆病敷料中5至180秒，结果表明没有一种产品能完全有效杀死对OP高度抗性的幼虫。几种产品表现不佳，甚至对易感种群也是如此。有效性并不总是反映活性成分的浓度。例如，总体上被认为最有效和最无效的产品都含有0.036%的丙虫磷，但配方却大不相同。杀幼虫效力对于将牲畜的损伤降至最低很重要，在杀虫剂抗性管理方面也很重要。在已知抗性程度的情况下，就有可能为蝇蛆病的最具成本效益的治疗提出建议。与此同时，对于羊毛生产者来说，使用基于丙虫磷的蝇蛆病喷射产品处理蝇蛆病损伤似乎有明显优势。
