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The aim of the study was to evaluate the effectiveness of acetamiprid in the control of rosy apple aphid (Dysaphis plantaginea) originating from 6 apple orchards in Poland. The mortality of aphids treated with acetamiprid at the dosage of 0.2 kg/ha was determined in laboratory conditions. As a result of the studies, reduced effectiveness of acetamiprid from 78.3 to 86.7% was noted for specimens of apple-tree aphid originating from four out of six examined apple orchards. High effectiveness of acetamiprid at the level of 89.7 to 95.3% was noted for the studied aphid populations in only two apple orchards. The obtained experimental results confirm a slight reduction in the effectiveness of acetamiprid in several populations of rosy apple aphid that may, but need not to be a result of resistance to this substance.

Effectiveness of acetamiprid in reducing rosy apple aphid population (Dysaphis plantaginea, Passerini) analysed in selected apple orchards