Incidence, harmfulness and some elements of the horse chestnut leafminer (Cameraria ohridella Deschka & Dimic) control on white horse chestnut (Aesculus hippocastanum L.)

Observations on the incidence, harmfulness and some elements of Cameraria ohridella con- trol on white horse chestnut (Aesculus hippocastanum L.) were carried out in Wroclaw, Poland, in 2001-2003. Three generations of the pest developed on A. hippocastanum. The leaf infestation by pest's larvae increased systematically throughout the spring-summer season. Cultural control by removing the fallen leaves was suggested. Using this procedure, the abundance of the pest was considerably reduced, therefore, the percentage of the leaf damage was lower and the trees lost these leaves later in the season.