The Major Issue for this week is exotic vs. endemic pathogens. Many of the plant disease epidemics that we have studied so far have been the result of introducing a new pathogen into an area where it did not exist before. We call these exotic diseases. However, not all plant diseases are the result of a new pathogen or new host being introduced to an area. Endemic plants are infected by endemic pathogens all of the time.

This Week's Point of Confusion is the difference between monocyclic and polycyclic disease cycles. PODCAST: pppodcastweek6.mp3