Witch’s Broom on the Willow (Winter Aspect)
Keeping the woodlands free of dead and dying trees and branches is a preventive of insect attacks that should never be neglected.
As showing the injury that can be inflicted on our forest trees by some of these insect pests, the following cases may be mentioned:—
During fifteen years (between 1853-68) the spruce in East Prussia, Poland and Russia was killed over an area of 7,000 square German miles; while in the Bavarian forests, the loss to the Revenue in one year was £40,000.
In both cases the destructive insect Liparis monacha was the cause of injury.