A STUDY OF BIONOMY OF THE PRIVET SAWFLY (Macrophya punctumalbum (L.)) (Hymenoptera, Tenthredinidae) – A PEST OF PARK PLANTS

Abstract

The study of the bionomy of privet sawfly (Macrophya punctumalbum (L.), a pest of park plants in the city of Poznań, was conducted during three vegetation seasons in the years 1981–1983, at the insectarium of the Department of Entomology at Agricultural University in Poznań. The aim of the study was to define the longevity and fecundity of imagines, larvae development of the species and the level of parasitizing the eggs of the privet sawfly by parasitoids of the Chalcidoidea superfamily. The sawfly occurred in the last ten days of May. The females lived from 4 to 36 days, most often quite short (73.3%), from 7 to 14 days. After reaching the stage of sexual maturity, which lasted mostly 8–9 days, they started laying eggs. The fecundity of females fluctuated between 1 and 122 eggs. The mean female fecundity was 52 eggs. It was found that the larvae of sawfly went through 5 instar stages. The parasitoids of the Chalcidoidea superfamily decreased the
abundance of the sawfly at the egg stage from 0.47% to 8.65%. Those were Anaphes cultripennis Debauche (Mymaridae) and Trichogramma sp. (Trichogrammatidae).