Scale are tiny little insects that have no arms or legs that are born with protective armor. Often introduced by birds, these pests will cling to a tree and stay there forever, literally sucking the life out of them. As it gets older, the scale will lay eggs and the tree, if left untreated, will be covered in bugs.
Elm Scale is a common form of tree pest in Alberta. Without regularly inspecting your elm trees, the damage may not be apparent until the infestation is high. Leaf discolouration and early leaf drop, twig and branch dieback and sticky honeydew dropping from the tree canopy are all signs of a scale infestation.
Spider mites are among the most common garden pest. The spider tree mite is in the same class as spiders and is also closely related to ticks. Like other spiders, they build webbing on plants. They will suck on the tissues in the leaves, damaging the plant. An infestation of spider tree mites can quickly get out of control as the female lives two to four weeks and will lay up to 20 eggs per day during that time.