Expert Tree Care from Certified Arborists in St Charles, Naperville, Downers Grove and Surrounding Areas!

Sawfly Insect Treatment in Winfield and Surrounding Areas

Sawflies are strange little caterpillars which do not visually resemble their name. These little green caterpillars with shiny black heads begin to show up, sometimes by the thousands, on a single susceptible tree or bush early in the spring. Their first appearance usually coincides with the flowering of Crabapple trees. These insects ‘rear their little heads’ most commonly on Scotch, Austrian & Mugho Pines.

Sawflies are hard to spot when they first hatch as they are smaller than the head of a pin and camouflage themselves by matching the color of the pine needles that they plan to devour. Within 6 weeks of hatching they quickly grow to over an inch long as they continually feed and damage the host plant. They develop into moths, mate, and then redeposit their eggs on their favorite plants. These eggs ‘overwinter’ extremely well and the process begins again the following year.

Homeowners who do not notice these insects at first are often shocked when they walk by the tree or bush, as this startles the insects. The plant seemingly ‘jumps to life’ as the hundreds or even thousands of Sawflies snap to attention in unison!

Mugho Pine bushes and Scotch and Austrian Pine trees can be severely damaged if not completely devoured. Usually much of the damage is permanent as the inner needles never re-appear. The plant can appear very thin and sparse until much later, after several years of new growth rebuilds the plant.


Sawflies are one of the easier insects to control as a variety of insecticides are effective against them. The problem however is that homeowners don’t usually treat their susceptible plants until the insect is clearly visible, and that is usually after they are full grown and much of the plant is damaged. Once you find Sawflies in your landscape plants it makes sense to treat them on a yearly basis, long before you notice their presence.

Experience the Tree Green Difference

At Tree Green, we don’t just care for trees; we care for people. Our approach melds hassle-free scheduling with prompt response times, so you can rest assured your time—and your trees—are highly valued. But what truly sets us apart is our blend of 1950s-style customer service with modern arboricultural expertise; it’s where time-honored values meet cutting-edge science.

We’re fully committed to exceeding your expectations at every step. Our certified arborists not only offer you the best tree care solutions but also extend the utmost respect to your property. In a world where customer service often falls by the wayside, we’re raising the bar, one satisfied customer and healthy tree at a time.