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Carpenter Costin Blog

Preventing and Treating Pine Sawfly Infestations

Pine Sawflies have hatched, or will be hatching soon, throughout our region. Be sure you have the proper management techniques in place.

The Pine Sawfly is a destructive pest that targets the two and three needle pines in New England, meaning they only infest pines where the needles are in bundles, or fascicles, of two and three needles each. Mugo Pines are usually the primary host for Pine Sawflies in the region.

Each year, Pine Sawflies will hatch into the larval stage and feast on two and three needle pines, like the Mugo pine, voraciously. What's unique about Pine Sawfly is that they only feed on the older needles of a pine, usually leaving the young needles unscathed. The Sawfly will form very tight groups and feed quickly, moving throughout a pine until it is completely defoliated.

Treating Pine Sawfly larvae can be done in two methods depending on how the groups are formed. Very small groups of the larvae can be pruned off the tree and disposed of. Larger groups; however, will require an insecticide treatment. Over the counter insecticides, such as Sevin, will work on Pine Sawflies, but be sure you’re familiar with the toxicity level of the product you buy.

Our pest management programs include Pine Sawfly treatments, but you can also choose a target treatment on Mugo Pines, or other pines if you’ve had an issue with this pest in the past. Request a free consultation to learn more about pest management programs.

Please check out our growing Insect Disease Glossary for more information!

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