What it is? Dutch Elm Disease (DED) is a devastating disease that affects all elm species. It is caused by a fungus primarily spread by three species of elm bark beetles. The disease obstructs the tree’s ability to transport water, ultimately leading to its death. Alberta was free from Dutch Elm Disease for the past […]
Tag: treeservice
Forest Tent Caterpillars
What is it? Forest tent caterpillars (Malacosoma disstria) is a pest of broadleaved trees and shrubs. They can completely defoliate a tree and cause tree health decline. Symptoms Damage What to do? Other resources: https://tidcf.nrcan.gc.ca/en/insects/factsheet/9374 https://gardening.usask.ca/articles-and-lists/articles-insects/article-forest-tent-caterpillar.php
Cotton Ash Psyllid
What is it? Cotton ash psyllid is an invasive pest to Calgary that attacks black ash and Manchurian ash trees. They like to attack trees that are already stressed. Symptoms Damage What to do? Other resources: https://www.calgary.ca/parks/pests/cottony-ash-psyllid.html https://gardening.usask.ca/articles-and-lists/articles-insects/cottony-ash-psyllid.php
Bronze Birch Borer
What is it? Bronze birch borer is known as metallic wood-boring beetle that feeds on birch tree. It usually attacks birch trees that are already stressed. It can kill a birch tree within a few years. Damages What to do? Other resources: https://tidcf.nrcan.gc.ca/en/insects/factsheet/283
Frost Crack
What is it? Frost crack is very common in winter, especially when temperature fluctuate dramatically during day and night. When the sun warms the bark, causing it to expand. As temperatures drop rapidly at night, the bark contracts faster that the underlying wood. This difference creates cracks in the bark and wood, known as frost […]
Eriophyid Mites
What is it? Eriophyid mites are many different types of translucent, microscopic mites that cause deformities in many plant species. They feed on cells under the plant surface and causes abnormalities of plant tissues such as witches’ brooms, curled leaves, galls, yellowed leaves. They also serve as an alternative food source for predatory mites, which […]
Bronze Leaf Disease
What is it? Bronze leaf disease is a fungus that infects various poplar species including Swedish columnar aspens, trembling aspens and tower poplars. Symptoms Damages What to do? Other resources: https://www.calgary.ca/parks/pests/bronze-leaf-disease.html https://agriculture.canada.ca/en/agricultural-production/crop-protection/diseases-and-pests-agroforestry/bronze-leaf
Ash Leaf Roller
What is it? Ash Leaf Roller is a moth that affects ash trees. As the caterpillar grows, it rolls the leaf into a cone shape, where the larvae continue to grow until they reach the pupal stage. The adult moths emerge from the leaf cones, typically starting around mid-July. Damage What to do? Other resources: […]
Western Ash Bark Beetle
What is it? Western ash bark beetles are small, oval shape, 2-3mm long and brown in color. They attack ash trees by tunneling between the bark and wood, causing branches to die. They usually attack dead and injured branches, and trees stressed by other factors, such as drought or incorrect pruning. Symptoms Damages What to […]
Aphids
What is it? Aphids are tiny pear-shaped, soft-bodied insects (2-4mm). They are generally green in colour, but also can be yellow, grey, black, brown and pink. Aphids can be found on most plants and trees. Female aphids can reproduce without males, leading to rapid population growth, especially in summer. Symptoms Damages What to do? Other […]