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, 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 – click here

Chestnut Leaf Blotch – click here

Chlorosis; Iron or Maganese Deficiency – click here

Cooley Spruce Gall Adelgid – click here

Cytospora Canker – click here

Decline of Blue Colorado Spruce – click here

Diplodia Tip Blight – click here

Dutch Elm Disease – click here

Eastern Spruce Gall Adelgid – click here

Eastern Tent Caterpillar – click here

Elm Leaf Beetle – click here

Elm Leafminer – click here

Emerald Ash Borer – click here

Emerald Ash Borer Pest Alert – click here

Euonymus Scale – click here

European and Redheaded Pine Sawfly – click here

Fall Cankerworm – click here

Fall Webworm – click here

Fire Blight – click here

Forest Tent Caterpillar – click here

Gallmakers – click here

Girdling Roots – click here

Gypsy Moth – click here

Honeylocust Plant Bug and Leafhopper – click here

Japanese Beetle – click here

Juniper Scale – click here

Magnolia Scale – click here

Mechanical Injury – click here

Nectria Canker – click here

Oak Wilt – click here

Ontario Pesticide Bylaw – click here

Pearslug Sawfly – click here

Pear Trellis Rust – click here

Phylloxera on Oaks – click here

Phytophthora Root and Crown Rot – click here

Pitch Mass Borer – click here

Powdery Mildew – click here

Rhizosphaera Needlecast – click here

Sapsucker Injury – click here

Salt Damage – click here

Spruce Needleminers – click here

Spruce Spider Mite – click here

Stigmina Needle Blight – click here

Tar Spot on Maples – click here

Taxus Mealy Bug – click here

Twospotted Spider Mite – click here

Verticillium Wilt – click here

Viburnum Leaf Beetle – click here

Water Stress/Leaf Scorch – click here

White Marked Tussock Moth – click here

White Pine Weevil – click here

Wood Decay – click here

Yellow-Headed Spruce Sawfly – click here

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