Using diversity to reduce the impact of exotic pests: how it should be applied

Summary

There are a multitude of exotic stressors, both insects and pathogens, that are or have the potential of, changing the landscape in our urban forests.  Diversity is often mentioned as a means to reduce the impact of these threats, but at what level, species, genus, family?  This session will cover the common factors as to why certain exotic stressors become destructive when introduced onto new continents and how diversity should be applied in our planting.