Short Answer: June is when several tree pests become visible and damaging in Hampton Roads, but most homeowners do not notice until significant damage is done. Bagworms attack evergreens (cedar, juniper, arborvitae, spruce) and have a narrow treatment window in June. Cankerworms strip leaves from oaks and hardwoods. Scale insects build populations through summer on hollies, magnolias, and other ornamentals. Each pest has a different treatment timing. Catching them in June is dramatically cheaper and more effective than treating in July or August when damage is severe.
If you have mature trees on your Hampton Roads property, June is a critical month for tree pest awareness. We see significant losses every year on properties where homeowners did not realize a treatable pest was active on their trees until canopy damage was severe. Many mature trees worth $5,000 to $30,000 are at risk from $100 to $300 treatments if applied in the right window.
We want to walk through the most common tree pests showing up in our area in June, what each one does, and what the right response is.
Bagworms: The Window Closes Fast
Bagworms are the larvae of small moths. They emerge from overwintering eggs in late May and early June and immediately begin feeding on evergreen foliage. As they feed, they build characteristic protective bags (made of silk and bits of host plant material) around themselves. By mid to late summer the bags are 1 to 2 inches long and visible from a distance, but by then treatment has become much less effective.
Susceptible species: Eastern red cedar, juniper, Leyland cypress, arborvitae, spruce, and other evergreens are most commonly affected. Bagworms can also feed on broadleaf trees but evergreens are their primary targets.
Treatment window: most effective during the first 4 to 6 weeks of larval activity (late May through early July). After that, the larvae have hardened and the bags provide significant protection. By August, treatment is essentially limited to hand-picking visible bags.
Damage signs: stripped foliage starting at the top of evergreens, individual bags hanging from branches, branches dying from the tips inward.
Cost: $80 to $200 for a typical residential property with multiple susceptible trees. Worth it considering that severe bagworm infestations can defoliate and kill mature ornamental trees.
Cankerworms (Inchworms): Spring to Early Summer
Cankerworms are inchworm-style larvae that feed on hardwood leaves. The fall cankerworm and spring cankerworm species both occur in our area, with peak feeding from late April through early June.
Susceptible species: oaks (especially water oak and red oak), maple, sweetgum, hickory, and many other hardwoods. Heavy infestations can defoliate large trees in 2 to 3 weeks.
Damage signs: holes in leaves, increasing to complete leaf loss as the season progresses. The larvae can be seen feeding on the leaves and hanging from silk threads. Significant droppings on cars, sidewalks, and outdoor furniture.
Treatment: BT (Bacillus thuringiensis) is a biological control that is highly effective when applied during the larval feeding period. Other targeted insecticides also work. Treatment cost varies by tree size; large mature trees may require professional spray equipment.
Scale Insects: Slow Build, Lasting Damage
Scale insects are small (1/8 to 1/4 inch) pests that attach to twigs, stems, and leaves and feed by sucking plant juices. They build up populations slowly over years if not treated.
Susceptible species: hollies, magnolias, camellias, euonymus, and many other ornamentals. Different scale species favor different host plants.
Damage signs: small bumps or specks on twigs and stems. Sticky residue (honeydew) on lower leaves and any surfaces beneath the plant. Sooty mold growing on the honeydew. Yellowing or thinning foliage. Gradual decline of affected branches.
Treatment: timing depends on the specific scale species. The crawler stage (when scale insects are mobile) is the most vulnerable to treatment. For many scale species in our area, the crawler stage occurs in May and June. Beyond crawlers, systemic insecticides applied to the soil or trunk can control established populations.
Aphids: Quick to Spread
Aphids are small soft-bodied insects that cluster on new growth and feed on plant sap. They reproduce rapidly and populations can explode within a few weeks if conditions favor them.
Susceptible species: roses, crape myrtles, hibiscus, vegetable garden plants, and many ornamentals.
Damage signs: distorted curling new growth, sticky residue on leaves and surfaces below the plant, sooty mold development, ants milking the aphids for honeydew.
Treatment: many options ranging from insecticidal soap (low impact) to systemic insecticides (more aggressive). Aphid populations also collapse naturally when beneficial insect populations (ladybugs, lacewings, parasitic wasps) are healthy.
Spider Mites: Hot Dry Conditions
Spider mites are tiny (barely visible to the naked eye) arachnids that feed on plant cells. Populations build during hot dry weather and can damage plants quickly.
Susceptible species: spruces, arborvitae, juniper, boxwood, and many others. Some mite species also affect annual flowers and vegetables.
Damage signs: stippled or speckled appearance to leaves (the result of cells being damaged), webbing in heavy infestations, yellowing and bronzing of foliage. The mites themselves are easier to confirm by tapping a branch over a white paper and watching for tiny moving specks.
Treatment: miticides or insecticidal soap. Strong water sprays can knock down populations. Maintaining adequate moisture in nearby beds helps because dry stressed plants are more susceptible.
The Walk-Through Approach
The most effective approach to June tree pest management is a thorough walk-through, ideally once in early June and again in mid June. Examine every major tree and shrub on the property.
For evergreens: check for bagworm activity at branch tips, especially near the top of the plant. Even small bagworm bags are visible if you know what to look for.
For hardwoods: check leaf condition. Are leaves whole and healthy, or showing holes and damage? Look for caterpillars, droppings, and silk threads.
For all ornamentals: check undersides of leaves for aphids, scale, and spider mites. Note any sticky residue, distorted growth, or yellowing.
For mature trees: check trunks for borer holes, bark cracks, or fungal growths. Check the overall canopy for any branches dying back from the tips.
What to Treat Yourself vs Professionally
DIY-friendly: aphids on small ornamentals (insecticidal soap), spider mites on shrubs (water sprays plus mites), bagworms on small evergreens (hand picking visible bags, plus DIY spray when reachable).
Professional: bagworms on large evergreens (reach and equipment), cankerworms on mature trees (height requires spray equipment), established scale infestations on multiple plants, borer damage on mature trees, any concern about high-value or specimen trees.
The cost-benefit math favors professional treatment for high-value trees. Mature ornamental trees often cost $5,000 to $30,000 to replace. A $200 treatment that saves the tree is dramatically cheaper than replacement.
Insurance and Tree Loss
For homeowners who lose significant ornamental trees to pest damage, homeowners insurance occasionally provides partial coverage depending on the policy and the specific cause. Most policies exclude pest damage but cover tree loss from storms or other natural events. Some specialty policies and umbrella coverage offer broader tree protection. Worth checking your specific policy after any significant tree loss. The coverage is uncommon but not unheard of.
Frequently Asked Questions
What if I have already noticed damage on my trees?
Schedule a property walk soon. Some damage is recoverable; some is not. Early intervention is the difference.
Can I use general insecticide on all of these?
No, and using broad-spectrum products often kills beneficial insects that would otherwise help control the pests. Targeted treatments per pest are dramatically more effective.
How do I know if a tree is worth saving?
Most mature trees in residential landscapes are worth significant investment to preserve. An arborist can give an honest assessment of tree condition and recoverability.
Will pests return next year if I treat now?
Some pests have one generation per year and treatment now prevents next year’s problems. Others have multiple generations and ongoing monitoring is needed. We can discuss specifics for your property.
The Cost of Tree Replacement vs Treatment
For homeowners weighing whether to invest in tree pest treatment, the replacement math is informative. A mature shade tree on a residential lot typically takes 15 to 25 years to grow to mature size. Replacement of a 30-foot tree with a 6-foot nursery tree costs $300 to $1,500 depending on species. The 15-year wait for the replacement to reach the size of the lost tree is far more significant than the dollar cost. The cost-benefit math on tree treatment is heavily favorable in almost all situations where treatment is technically viable. Investing $300 to $1,000 to save a $5,000 to $30,000 mature tree is straightforward economics.
What to Do Next
If you have not done a tree and ornamental pest walk this June, schedule one within the next week. The window for several pests is closing.
If you want a certified arborist to walk the property with you, we offer that service. Call us at 757-238-8901 or visit meadowlawnandpest.com. We serve Hampton Roads including Newport News, Norfolk, Virginia Beach, Chesapeake, Suffolk, Smithfield, Carrollton, Isle of Wight County, and surrounding communities.