Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Megastigmus strobilobius Ratzeburg, 1848 (Hym., Torymidae): its morphology, life history and economic significance.

Abstract

On the basis of investigations carried out in stands of Picea abies and P. obovata in France and Poland in 1975-86, details are given of the development stages, life history, morphology, distribution and economic importance of the torymid seed pest Megastigmus strobilobius. The life cycle of the pest appeared to be well adapted to the characteristics of the host trees, and especially to the asynchronous fluctuations in the seed crop. Seed damage was generally limited (less than 5%) but may occasionally increase under favourable circumstances.