In the article, the results of long-term research (2006–2010) on biological substantiation and the improved potato protection system against Colorado beetle in Belarus are presented. The system is based on age and the phenotypic structure of the phytophage population definition, and their resistance monitoring to pyrethroids by frequency of phenomorph №3 occurrence. The system includes a pre-planting tuber treatment, or spraying growing plants with different preparations. The economic expediency thresholds of insecticidal protection depending on weather conditions, varietal features, planned productivity, and a special-purpose designation of the crop cultivated in different agroclimatic zones were taken into account. Now, the improved system of potato protection against the pest is widely promoted on the farms of the Republic.
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