The aim of the studies was to determine the level of damage to registered cultivars of winter oilseed rape caused by pests. The following oilseed rape pests were taken into consideration: turnip ceutorrynchus (Ceutorhynchus napi Gyll.), cabbage stem weevil (Ceutorhynchus quadridens Panz.) and pollen beetle (Melighetes aeneus F.). The studies were carried out in 2007–2009 on 53 registered cultivars of winter oilseed rape in Poland, including 20 restored hybrids, 2 composite hybrids and 31 open-pollinated hybrids. Field experiments were located in two Plant Breeding Stations: Borowo and Małyszyn, and Experimental Field Station of Research Centre for Cultivar Testing – Rarwino. In Poland, the damage to oilseed rape plants caused by stem pests (turnip ceutorrhynchus and cabbage stem weevil) increases. Stem pest cause most losses, especially, in the south-western part of Poland. The factors favourable for these pests’ development are agrotechnical simplifications and warm springs. Last years pollen beetle was considered as a less harmful pest causing lower losses in some regions of Poland. Damage to oilseed rape cultivars caused by stem pests and pollen beetle depends on agroclimatic conditions and diversified varietal factors. The results of performed studies did not show any significant differences in the level of damage to winter oilseed rape cultivars caused by pests.
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