Dispersal of Fenusa Dohrnii (Hymenoptera: Tenthredinidae) From an Alnus Short-Rotation Forest Plantation

Abstract

The European alder leafminer, Fenusa dohrnii , is a defoliating insect pest of Alnus in short-rotation forest plantations. A 2-year study was performed to quantify movement from infested stands to uninfested areas. Sticky traps and potted monitor trees were installed at different locations within and at various distances from (0, 5, 10, and 20 m) an infested stand to measure adult flight and oviposition activity, respectively. Trap catch and oviposition activity fell off sharply with distance, few insects being trapped or eggs laid at distances of 5 m or greater from the infestation.