The Major Concept for this week is the role of people in spreading plant diseases. In order for a plant disease to spread plant pathogens have had to evolve various methods for moving from an infected plant to a healthy one. With the advent of agriculture, humans became a very effective means for moving plant pathogens both short and long distances.

This Week's Point of Confusion concerns the classification of fungi into different fungal groups. Just like plants and animals, fungi have been classified into groups based on their characteristics. PODCAST: pppodcastweek3.mp3