Some tree diseases and insects occur in urban settings, but they seldom cause serious damage. In urban environments, prevention is the most important step. It is important, first of all, to choose a planting site with the right conditions for the species of interest. Next, the tree will need to be protected against mechanical injury and be given proper care to maintain its vigour. Urban trees become vulnerable to insects and diseases primarily when their vigour declines as a result of exposure to stress. Trees are especially vulnerable in the first few years after they are planted.
Insects and decay- and canker-causing organisms that attack the trunk and branches are the biggest threat to trees and necessitate control measures. That is why it is so important to prevent injuries that could provide easy access for these types of pests.
The type of treatment required depends on the severity of the attack and generally requires consulting an expert. The solution may involve fertilizing a tree that is suffering from nutrient deficiency, using tree surgery techniques to treat an injury or applying some kind of treatment to control an insect or a disease. There are ways to suppress insects and diseases that do not involve using chemical pesticides and that are more environmentally sound. Whatever the case may be, it is important to consult specialists to determine when and how to take action.
Source: Insects and Diseases of Canada's Forests |
