Three major scenarios can occur with regard to
introduced pests. The first, an introduced pest
attacking a native tree is the most well known type
of introduction, often causing extensive mortality in
natural stands. Examples of this scenario are
numerous and found throughout this review. The
second scenario occurs when both the pest and the host
tree are introduced. For example, the exotic wood
wasp attacks plantation
stands of exotic radiata pine in New Zealand, at times causing tremendous
economic losses