Sawfly
Neodiprion sertifer
Non-stinging wasps (not flies) with over 100 species attacking conifers and some broadleaf trees. Larvae feed on needles, preferring older needles which they consume entirely, leaving partially eaten needles looking like fine straw.
Identification & Symptoms
What to Look For
Potential Damage
Lifecycle
One generation annually. Overwinter in cocoons in duff or on twigs. Adults emerge in spring, females lay eggs in needle edges. Larvae hatch in about a month, feed for another month, then drop to ground to spin cocoons.
Professional Treatment Approach
Insecticide applications during larval feeding periods
Remove and destroy egg-laden needles when possible
Biological control with natural predators
Monitor for early larval activity in spring
Recommended Mauget Products
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