Cereals are exposed to considerable losses caused by harmful insects. In the years of the study of production and economic effects of pest control in winter wheat, leaf beetle larvae damaged from 31.6 to 49.8% of leaf blade area. The aim of this study was to evaluate the effectiveness and economic efficiency of the insecticides applied in leaf beetle larvae control in winter wheat. The assessment of wheat damage by leaf beetle larvae was made by determination of a percentage of leaf blade area damage. Each combination of protection against pests used in this study contributed to a significant reduction of the percentage of leaf blade area damage, in relation to the combination without treatments. Insecticides used to control Oulema spp. larvae showed a good efficiency on the level on average from 70.3 to 90.9%. The value of production saved as a result of applying plant protection treatments ranged from 54 to 532 PLN·ha^-1, on average 221 PLN·ha^-1. Cost of protection of one hectare of winter wheat against leaf beetle larvae was low and ranged from 76 to 118 PLN·ha^-1. Cost covering ratio ranged from 0.6 to 7.0 depending on the year of conducted investigation. Treatment profitability index was on average 1.4, and percentage index of costs ranged from 1.2 to 4.1.

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