Botany - Diseases and Defects

3 fungal diseases

Powdery mildew (white-grey, powdery patches)

Plant rust (powdery, blister-like, rust-color pustules)

Corn smut (turns parts of corn into swollen growths filled with a black powder)

3 bacterial diseases

Crown gall: Enters through wounds; causes woody, tumor-like growths that interrupt flow of water/nutrients

Bacterial blight: Spots of brown surrounded by yellow ring; premature leaf drop; wilting

Bacterial wilt: Clogs xylem (and therefore water transport)

1 viral disease; 2 nematode diseases

Tobacco Mosaic Disease: Mottled, mosaic-like yellow and green patterns on leaves, stunted growth

Root knot disease: Invades roots, creating galls/knots in them.

Pine wilt: Interferes with water transport

Polycyclic vs monocyclic

For diseases.
Polycyclic: One infection cycle (from landing on healthy plant to multiplication and spread) per growing season
monocyclic: Many infection cycles per growing season