Toxic effects of Reslin 25 SE aerosol and Snip bait on a sensitive strain (SRS/WHO) and wild resistant population (Polianka) of the housefly were investigated. Higher than 90% mortality and knockdown effect was observed in houseflies exposed to Reslin 25 SE aerosol for ten minutes in laboratory and field experiments. The Snip bait caused 90% mortality and knockdown effect in the sensitive strain after 8-min exposure while demonstration of toxicity in the wild strain was decelerated considerably. Langer than 60 min action was needed to produce 90% mortality and knockdown effect in flies of the latter strain. A combined method of control of resistant flies using Reslin 25 SE aerosol and Snip bait was tested in practice in pig houses. During the 11 experimental weeks, from June 14 to August 28, 83 % (67-93) effectiveness was reached on average. The results obtained point to the high effectiveness of non-persistent insecticides when we apply them in combination using their aerosol and bait forms.
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