Tree Pests & Diseases
HORTICULTURAL PESTS & DISEASES
Long term maintenance of your plantings will go a long way to having healthy happy trees for years to come. However, it can take just a blink of the eye to introduce a wide spectrum of pests and diseases.
There are many excellent resources that list numerous types of pests and diseases, what they look like, how they attack your trees and perhaps how to slow their progress in order to save your trees.
Mammal Pests
We are fortunate to share this planet with some beautiful animals, but then we do have to share their nature with them. 
There are many ways that mammals can cause damage
Mammal Damage
Protecting Trees from Animal Damage
Vertebrate Pest Management
Porcupine Damage
Squirrel Damage (Google images)
Identifying Wildlife Damage to Trees, Shrubs and Bushes
Squirrels
Tree Squirrels
Deer and Rabbits and Mice, oh My!
Bird Pests
Birds can be pretty and cheerful, but can also be hard on trees. 
Woodpecker & Sapsucker Damage
Yellow-bellied Sapsucker
Insect Pests
Oh so many bugs out there... here are some common ones that Prairie gardeners might see.
Common Aspen Pests
Control of Borers in Prairie trees
Tree Borer Damage (images)
Emerald Ash Borer
Bronze Leaf Borer
Borers of Pines
Larger Boxelder Leafroller
Early Aspen Leaf-curler
Tent Caterpillars
Ugly Nest Caterpillar
Metallic Pitch Blister Moth
Spruce Budworm
Balsam Fir Sawfly
Elm Leafminer
Aphids
Satin Moth
Sooty Mold
Insect Pests of Saskatoons
Insects on Saskatoons
Carpenter Ants
Ants
Insect Information - Ants
Red Lily Beetle
Beware the Destruction Caused by Bark Beetles
Scale Insects of Trees and Shrubs
Top Forest Insects
Insect Fact Sheets
Fungi Diseases
Bronze Leaf Disease (BLD)
Late Blight of Potato and Tomatos
Botrytis - Most Common Disease of Lilies
Armillaria Root Disease
Powdery Mildew on Trees & Shrubs
Botrytis (Gray Mold): A Disease for Many Plants
Environmental Issues
It may surprise you how often problems with trees are caused by the environment or are human-related.
Weather
Frost and Winter Damage
Pruning Trees & Shrubs - scroll to the bottom of article for info on repairing weather damage to trees
Sunscald of Hardwoods
Winter Injury on Trees
Chemical
Salt Tolerance of Plants
Act Now to Save Your Plants from Salt Damage
Trees & Shrubs that Tolerate Saline Soils and Salt Spray Drift
Minimizing de-icing salt injury to trees
Mechanical
General Resources
AgriCulture & Agri-Food Canada pest fact sheets
University of Saskatchewan GardenLine
City of Regina
Natural Resources Canada: Diseases
Natural Resources Canada: Insects
Pest and Disease Control Using Horticultural Oils
Firewood - Don't Move it: Buy it Local, Burn it Local
Diseases of Vegetables
Tree Guide of Diseases and Pests
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