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Aphids, commonly known as plant lice are small, pear-shaped, fragile insects
Apple maggot (Rhagoletis pomonella) is a pest fly native to North America, and has been a serious pest of apples in Canada for over 100 years.
The ash borer or lilac borer (Podosesia syringae) is a day-flying clearwing moth native to North America. The larvae feed on the bark and wood of ash trees and lilacs.
The adult of the ash leaf cone roller (Caloptilia fraxinella) is a small gray moth with a 12 mm wingspan. This insect is native to North America.
Three species of sawflies (Fenusa pusilla, Profenusa thomsoni, Heterarthrus nemoratus) introduced from Europe in the early 1970s can be responsible for the premature browning of birch trees
Black knot (Apiosporina morbosa) is a fungal disease that causes greenish brown to black swellings in the stems of cherry trees (Prunus spp.).
This beetle (Agrilus anxius), native to North America, is 7-11 mm in length and dark green-bronze in color.
The disease will develop over the summer and infections will spread internally to other parts of the trees. Symptoms typically appear in later summer (early-mid August) or early fall (September) Bronze Leaf Disease
Bruce Spanworm overwinters as eggs laid singly on twigs. The eggs hatch near the green tip stage of apple.
Adelgids are a small group of insects that are closely related to aphids
The cottony psyllid (Psyllopsisdiscrepans) belong to the family of insects sometimes called jumping plantlice.
Dothiorella elm wilt is a disease involving a fungus (Dothiorella ulmi) that causes the wilting and progressive die-back of American and Siberian elm trees.
Dutch Elm Disease (DED) is a deadly disease caused by a fungus (Ophiostoma ulmi) that can affect any elm tree.
European elm scale (EES) is a pest that normally attacks fruit and ornamental trees.
The forest tent caterpillar (Malacosoma disstria) is a pest of broad-leaved trees and shrubs. Young caterpillars are black, hairy and about 3 mm long. They cluster together on the trunk or branches when they are not feeding.
The larch sawfly can be detected by looking for the slits on new shoots in which females have deposited their eggs or checking for groups of larvae crawling on the branches
The large aspen tortrix is one of the main insects associated with the trembling aspen. This species occurs throughout the geographic range of the trembling aspen, its preferred host.
The larger boxelder leafroller (Archips negundana) is a green caterpillar found on Manitoba maple (boxelder) trees during spring and early summer.
The linden looper overwinters in the egg stage on host trees. In May, or as soon as the buds begin to open, the larvae emerge and begin feeding on the new foliage.
The mountain pine beetle is a small, black beetle about the size of a grain of rice.
Females lay eggs on needles. After hatching, pale green larvae mine the needles. Older larvae live in silk tubes hidden inside a mass built of silk and frass.
Pitch moth larval feeding causes infested conifers to produce copious amounts of resin that form globular masses on bark.
Porcupines can cause significant damage to personal and public property by feeding on trees.
The caterpillars feed principally on the leaves of poplar and willow trees and less commonly on oak
Spruce beetles occur in endemic populations in white spruce stands throughout Alberta.
The spruce spider mite (Oligonychus ununguis) is a common pest found on spruce trees. Adult mites are green-brown, have 4 pairs of legs and are scarcely visible to the unaided eye.
The insect is named after its untidy, nest-forming characteristics. Larvae of the ugly nest caterpillar hatch from overwintering eggs in the spring and may be found feeding throughout May to September.
Bucks rub their antlers on small, flexible trees in order to rub off the velvet that initially covers them. During rut, bucks rub their antlers on trees to attract receptive does and to demarcate territory and warn other bucks to stay away.
Infection by western gall rust results in round or pear-shaped galls on branches or stems of susceptible pine hosts.
Yellow-bellied Sapsuckers are fairly small woodpeckers with stout, straight bills.
The yellowheaded spruce sawfly (Pikonema alaskensis) is native to North America. Mature larvae are about 20 mm (3/4 of an inch) long. They look like hairless green caterpillars with a series of darker stripes running along the body. They have a distinctive dark yellowish head.
