The Major Concept for this week is the bacteria. Bacteria are tiny, single-celled organisms, in contrast to fungi, plants and animals, which are all multicellular. A single bacterium is smaller than the spores produced by fungi.

This Week's Point of Confusion is the term inoculum. For any plant disease, inoculum must be present to initiate the first, or primary, disease cycle as well as any subsequent, or secondary, disease cycles. PODCAST: pppodcastweek4.mp3