The effect of an integrated pest management program on the arthropod populations in a Hungarian apple orchard.
A comparative investigation on integrated pest management in an apple orchard was carried out for three years in Hungary. Significant changes in the structure of the phytophagous and zoophagous population communities were observed. Meaningful trends are presented and discussed. Owing to the regular application of selective insecticides the population density of parasitoids and predators increased and at the same time the density of Archips rosanus, Pandemis heparana, Phyllonorycter blancardella, P. corylifoliella and the tetranychid mites Panonychus ulmi and Tetranychus urticae decreased. The density of Stephanitis pyri and Quadraspidiotus perniciosus increased.