Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Impact of cone and seed insects in a red pine seed orchard.

Abstract

The development and fate of the 1985 cone crop was followed in a red pine [Pinus resinosa] seed orchard in Wisconsin. Eucosma monitorana larvae killed 42.3% of the cones; Asynapta sp. and Dioryctria disclusa killed, respectively, 17.5 and 6.7% of cones. A further 8.3% of cones initially observed in May failed to develop. A total of 25.2% of cones survived to maturity, but radiographic analysis showed <1 filled seed per cone. Cydia toreuta destroyed 30.5% of developed seed and 67.1% was empty. Management implications of the almost total loss of the cone crop are discussed.