Monoterpene composition of the preformed and induced resins of Scots pine,and their effect on bark beetles and associated fungi

Inoculations of fungi or introductions of insects were performed on Scots pines. The monoterpene composition of the induced resin differed from that of preformed resin, but did not depend on the nature of the aggression on a same tree. There were variations in the composition of induced resin according to tree. Mycelial growth was strongly limited, more by the increase in resin quantity and total monoterpene quantity than by the qualitative changes of the monoterpene composition. Monoterpenes appeared very toxic for Tomicus piniperda, but not for Ips sexdentatus.