Development of Monochamus galloprovincialis Olivier (Coleoptera, Cerambycidae) in cut trees of young pines (Pinus sylvestris L.) and log bolts in southern Finland

The development ofthe later juvenile stages of Monochamus galloprovincialis Olivier was studied under field conditions in southern Finland, with freshly cut young Scots pines and log bolts as breeding material. Females had oviposited on the breeding material in summer 1988, and observation of the material was continued until July 1991. To complete their life cycle the majority of the larvae appeared to need two years, although roughly 10% emerged following the first winter. Mortality was affected by loosening of the bark, drying of the wood, and probably by certain unidentified Diptera larvae.