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The article describes a noctuid moth Cosmia affinis as a pest of deciduous trees. The main purpose of the work is to determine the percentage of damaged deciduous trees of different types, which were damaged by the pest noctuid moth and the influence of climatic factors on their numbers. The main work results are the following: calculated percentage of the trees leaf blades damage, the researcher has indicated the percentage of deciduous trees, damaged by noctuid moth, presented a phenocalendar of a noctuid moth Cosmia affinis development and the occurrence of pests’ frequency in number.