North Carolina Pest News – August 9, 2013 (Ornamentals & Turf)

— Written By Amie Newsome and last updated by Nikki Davis

North Carolina State University * College of Agriculture & Life Sciences
Departments of Entomology and Plant Pathology * Raleigh, NC 27695

Volume 28, Number 18, August 9, 2013

CAUTION: The information and recommendations in this newsletter are applicable to North Carolina and may not apply in other areas.

From: Steve Frank, Extension Entomologist

Redheaded Pine Sawfly

This week we had a clinic report of pine defoliation on North Carolina State University campus. The culprit is probably the redheaded pine sawfly, Neodiprion lecontei. It is a pest of pines in ornamental landscapes, nurseries, and plantations. Adults emerge in spring and a second generation occurs in mid-summer. Eggs are laid on many 2 and 3 needled pine species such as Jack pine, loblolly pine and red pine. Sawflies are not flies and the larvae do not turn into butterflies. They are non-stinging herbivorous wasps. They can defoliate trees and bushes in the landscape. Since they are gregarious it is sometimes possible to prune off an infested branch and remove all the larvae. Management for sawflies is similar as for caterpillars though not all the insecticides will work so check the label. Horticultural oil is a good bet especially for small larvae. Formulations that contain azadirachtin or spinosad are also effective. For sawflies and caterpillars, management of full-grown caterpillars is generally not warranted. The damage is already done and they are hard to kill.