As the ground thaws and the sun begins to stay out longer, Southern Ontario’s landscape comes back to life. Unfortunately, it isn’t just the tulips and maples waking up—spring is also peak season for a variety of pests that can damage your lawn, threaten your trees, or hitch a ride into your home.
Being a proactive homeowner means knowing what to look for before an infestation takes hold. Here is the definitive list of the top outdoor pests to watch for this spring.
The Heavy Hitters: Lawn and Tree Destroyers
1. White Grubs (Japanese Beetle Larvae)
Grubs are the most common cause of spring lawn failure. These C-shaped larvae spend the winter deep in the soil and rise to the surface in the spring to feast on grass roots.
- The Sign: Spongy patches of brown grass that can be rolled back like a carpet.
- Watch For: Skunks or raccoons digging “divots” in your lawn at night to find these protein-rich snacks.
2. Spongy Moth Caterpillars
Formerly known as the Gypsy Moth, these hairy caterpillars hatch in May and have a voracious appetite.
- The Threat: They can completely defoliate a mature oak or maple tree in a matter of days.
- The Look: Distinctive pairs of blue and red dots along their backs.
3. Chinch Bugs
These tiny insects are often mistaken for drought damage. They drink the sap from grass blades and inject a toxin that causes the lawn to turn yellow and die.
- The Sign: Brown patches that start near sunny sidewalks or driveways and don’t respond to watering.
The Health and Nuisance Risks
4. Black-Legged Ticks
Ticks become active the moment the temperature hits 4°C. In the spring, “nymph” ticks are as small as a poppy seed, making them incredibly hard to find on pets or children.
- The Threat: They are the primary vectors for Lyme disease in Ontario.
- Where They Are: They wait at the tips of tall grass or in leaf litter, waiting for a host to brush by.
5. Carpenter Ants
Spring is “swarming” season for carpenter ants. While they don’t eat wood, they hollow out damp or decaying wood to build their nests.
- The Warning: Seeing winged ants inside or near your foundation is a sign that a colony is looking to expand.
6. Boxelder Bugs
While harmless to your home’s structure, these red-and-black insects emerge in massive clusters on the sunny, south-facing sides of houses, which can be an overwhelming sight for homeowners.
Invasive Species to Watch
7. Spotted Lanternfly
This high-priority invasive species is moving toward our region. They feed on fruit trees and maples, secreting a sticky “honeydew” that attracts stinging insects and causes black mold growth on decks.
- Action: If you see a black-and-white spotted nymph or a grey-and-red adult, “snip it, squish it, and report it.”
8. Emerald Ash Borer
This metallic green beetle continues to threaten ash trees across the province. Spring is the critical time to monitor for D-shaped exit holes in the bark or thinning tree canopies.
Stop the Invasion Before It Starts
The most effective way to manage these pests is to prevent them from establishing a foothold on your property. While yard maintenance—like keeping the grass short and clearing leaf litter—is a great start, a professional barrier is your best line of defense.
The Spider Guys specialize in high-performance outdoor barrier treatments. Our professional-grade exterior sprays are designed to create a protective shield around your home and perimeter. By targeting the “front line” where these pests live and travel, we stop ticks, ants, and spiders before they ever reach your door.
Keep the pests in the woods and off your property this season.
Contact The Spider Guys Today for Your Professional Spring Exterior Spray