Insects and Diseases

We perform timely treatments using the least toxic or invasive method to maintain pests and diseases at a level that does not cause a problem to plant health. These treatments consist of foliar sprays, soil applications and trunk injections. The frequency and products used varies depending on the insect or disease, type of plant, its location, environment and the weather. By reducing injury to plants, we help them to better produce, utilize and store their own sugars which improves overall plant health.

Infestation by certain insects can cause the death of the host plant, a result that can often be prevented. Emerald Ash Borer is one of those insects. We offer trunk injected treatments to protect Ash trees from this pest. Trees that are already infested may not respond to treatment.

It should be noted that many insects are beneficial and not all diseases have a chemical control. Often insects and diseases are a secondary problem and the primary cause may go unnoticed. Focus should be on complete plant health care which may include; pruning, trimming, fertilization, aeration/vertical mulch/mcycorrhizae inoculation, watering, choice of plant and location, soil conditions, anti-desiccant applications and skoot rodent repellent.

Insect and disease information bulletins:

Algae, Lichen and Moss



Apple Scab

Ash Flower Gall Mite

Asian Long-horned Beetle

Bacterial Wetwood/Slime Flux


Beech Bark Disease

Birch Catkin Bug

Birch Leaf Miner

Black Knot

Black Vine Weevil

Boxwood Leaf Miner

Bronze Birch Borer

Butternut Canker

Cedar Leaf Miner

Chestnut Leaf Blotch

Chlorosis; Iron or Maganese Deficiency

Cooley Spruce Gall Adelgid

Cytospora Canker

Decline of Blue Colorado Spruce

Diplodia Tip Blight

Dutch Elm Disease

Eastern Spruce Gall Adelgid

Eastern Tent Caterpillar

Elm Leaf Beetle

Elm Leafminer

Elm Leafminer

Emerald Ash Borer Pest Alert

Euonymus Scale

European and Red-Headed Sawfly

Fall Cankerworm

Fall Webworm

Fire Blight

Forest Tent Caterpillar


Girdling Roots

Gypsy Moth

Honeylocust Plant Bug and Leafhopper

Japanese Beetle

Juniper Scale

Magnolia Scale

Mechanical Injury

Nectria Canker

Oak Wilt

Ontario Pesticide Bylaw

Pearslug Sawfly

Pear Trellis Rust

Phylloxera on Oaks

Phytophthora Root and Crown Rot

Pitch Mass Borer

Powdery Mildew

Rhizosphaera Needlecast

Sapsucker Injury

Salt Damage

Spotted Lanternfly

Spruce Budworm

Spruce Needleminers

Spruce Spider Mite

Stigmina Needle Blight

Tar Spot on Maples

Taxus Mealy Bug

Twospotted Spider Mite

Verticillium Wilt

Viburnum Leaf Beetle

Water Stress/Leaf Scorch

White Marked Tussock Moth

White Pine Weevil

Wood Decay

Yellow-Headed Spruce Sawfly

Many thanks to Dave Cheung for the use of his Insect and Disease images.