European Pine Sawfly

    European Pine Sawfly

    Neodiprion sertifer

    european pine sawfly

    Adult European pine sawfly (Louis-Mochel Nageleisen, Department of Forest Health, Bugwood.org)

    pine sawfly larvae

    Young European pine sawfly larvae (Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org)

    pine sawfly damage

    European pine sawfly damage (Steven Katovich, USDA Forest Service, Bugwood.org)

    Pest Description

    • adults: 1/3 inch; males are mostly black with feathery antennae; females are reddish brown
    • larvae: caterpillarlike and ~ 1 inch; green body with white, green and gray/black stripes; shiny black head
    • larvae will rear their heads when disturbed

    Host Plants, Diet & Damage

    • mugo pine; other pine species
    • prefer to consume older needles from tip to base
    • larvae often feed in groups
    • brown scars on needles where eggs have been inserted

    Biology, Life Cycle & Damaging Life Stage

    • overwinter as eggs inside needles
    • eggs hatch in mid-spring and larvae feed on old needles
    • pupate on host bark or around the host in early to mid-summer
    • adults emerge in late summer to mate and lay eggs in needles
    • one generation per year
    • larvae are the primary damaging stage

    IPM Recommendations

    • Manage trees to improve or maintain health.
    • Monitor in fall through early spring for egg-laying scars on needles and in the spring for damage to old needles and larvae (late-April to early-May).
    • Low-level infestations can be tolerated.
    • Wash larvae off with a strong spray of water.
    • Spot-treat young larvae with an insecticide (azadirachtin; horticultural oil; insecticidal soap; organophosphate; pyrethroid; spinosyn) when monitoring indicates their presence.