Activity from the roseslug sawfly is being seen in our county. The symptoms are white or tan areas on rose leaves, also called windowpaning, as a result of insect larvae eating away the surface area of the leaf between the veins. The rose will grow new leaves to replace the browsed ones. But if a homeowner would like to manage the situation, then monitoring the plants for early signs of eggs and larvae is the best practice. A strong jet of water may dislodge them, or a spray of soapy water may also disrupt them. Squishing them by hand is particularly effective, though not practical for a large planting. — Lisa Chiariello is the Master Gardner coordinator for Rutgers Cooperative Extension of Sussex County.
/ / / Managing the pesky insect known as the roseslug sawfly