What causes pest outbreaks?

Insectomania.org lists several causes of agricultural pest outbreaks that you should know.

1. The concentration of a single plant species/variety in ever larger and more extensive monocultures...
2. Generally, high yielding crop cultivars can provide improved conditions for pest colonization...
3. Reductions of natural enemies around crops...
4. Intensification...
5. The ...accelerated movement of plant material around the world...
6. Virtual reliance on chemicals...

Learn more about agricultural pest outbreaks.