Tree pests in New England don’t wait for summer; many become active in early spring. By the time damage such as chewed leaves or curled foliage becomes visible, pests have often been feeding for weeks.
Knowing the early signs of tree pests and how to control them can help stop pesky bugs like sap suckers and leaf chewers before they cause severe damage. This guide focuses on the most common early-season pests seen in Massachusetts, Cape Cod, and throughout the Northeast.
Sap-Sucking Tree Pests: How to Spot Early Damage in Spring
Sap suckers are insects that pierce bark to feed on nutrient-rich sap. Be on the lookout for these early signs of damage from sap suckers:
- Yellow stippling or tiny white/bronze spots on leaves
- Sticky residue (honeydew) on leaves or pavement. You may also see an increase of wasp activity as they feed on honeydew.
- Sooty mold from honeydew accumulation
- Leaf curling or premature leaf drop
- Visible insects
Here are a few examples of sap-sucking insects and the trees they prefer:
- Woolly adelgid (hemlocks)
- Spider mites (spruce, arborvitae)
- Scale insects (maples, magnolias, yew, and holly)
- Aphids (oaks, birch, fruit trees)
Leaf-Chewing Insects on Trees: What to Watch in May and June
Leaf-chewing insect damage causes holes, missing edges, skeletonized leaves, and even full defoliation of leaves on trees. Insect damage on tree leaves can look like:
- Tattered or curling leaves
- Webbing or frass (insect droppings)
- Rolled or folded leaf margins
- High numbers of green caterpillars in tree canopies
Here are a few examples of early-season chewers in New England and the trees they prefer:
- Winter moth larvae (maples, crabapples, oaks)
- Leafrollers (ornamentals, fruit trees)
- Gypsy/spongy moth caterpillars (oaks, birch)
- Eastern tent caterpillars (wild cherry, apple, crabapple)
- Sawflies (pines)
How to Control Tree Insects in New England Before They Spread
The best time for pest control for trees in Massachusetts is in late March or early April, before they fully emerge. Pruning infested branches can help stop the spread, while horticultural oil applications and systemic insecticides can reduce overwintering insect populations when applied at the right time and with precision.
Tree Pest Prevention Tips for Massachusetts Homeowners
While treatment is possible, prevention is best to stop pests before they spread. Here are our prevention tips for early summer tree pests:
- Fertilize trees in early spring to provide nutrients for the tree. However, avoid excess nitrogen, which can encourage aphids and soft-bodied pests
- Mulch to protect root health and conserve moisture
- Prune properly to remove dead or diseased branches that attract insects
- Water trees regularly if dry spring conditions persist
At Hartney Greymont, we have local arborists in Needham, Concord, Danvers, Cape Cod, and surrounding areas who have the knowledge to identify and treat pests before they cause severe damage.
BE ON THE LOOKOUT FOR THESE SPRING PESTS
Common Questions About Spring Tree Pests in New England
Look for sticky leaves, curling foliage, visible webs or eggs, or tiny holes and chew marks early in the season. Many early insects are small and good at hiding. Make sure to look at the underside of leaves and tender new emerging foliage.
Not all insects are pests. Sap-suckers and chewers cause damage, while many beetles and pollinators are harmless or beneficial. An arborist can help identify harmful pests.
Hemlocks (woolly adelgid), spruces (mites), crabapples, oaks, and maples are common targets in New England landscapes.
A professional certified arborist can easily identify pest infestations and develop a treatment and prevention plan that can save your landscape. Davey’s certified arborists are backed by the scientists at our Davey Institute.
