Nowadays the higher occurrence of cereal insects is observed. Until recently it has been considered to be of little economic relevance. Today cereal insects develop better, thanks to the climate warming, simplification of agricultural techniques and extensive farming in large areas. One of the most pervasive species is leaf miners from the Agromyzidae family, which larvae feed on inner side of the cereal leaves. In Poland there is more than a dozen species of leaf miners (Walczak, 1995). They may occur locally in large numbers, and cause substantial damage to the crops which reduce quality and quantity of the harvest. Larvae of the leaf miner feed on the parenchyma, causing damages (so-called mines). Effective methodology of fighting the insects with chemical means have not been developed yet. Studies of integrated methods of cereals protection carried out so far, have shown that a good practical method of chemical signaling is to control the number of adults trapped on yellow traps. Monitoring of cereal leaf miner flights in winter wheat was carried out in Slupia Wielka and Baborowko (Greater Poland Voivodeship) in the 2011/2012 and 2012/2013 growing seasons. Yellow traps were placed above the tops of wheat during vegetation period. The number of damaged wheat stems was recorded. Fluctuations in weather conditions during the research affected the dynamics of leaf miner flies considerably. The most common species were: Chromatomyia nigra (Ztt.), Chromatomyia fuscula (Ztt.) and Poemyza superciliosa (Ztt.).