Black Rot

• Black rot is a bacterium that turns leaf margins yellow with a V-shaped pattern and leads to discoloration of the vascular stems. The disease can affect the cabbage family as well as sweet potatoes.
  
  

Blight

• Blight is a bacterium that causes water-soaked blotches that become yellow and brown, later becoming sunken and dry. Blight can affect dry beans, lima beans and peas.
  
  

Crown Rot

• Infected crowns will turn bright yellow and may have vascular discoloration. Crown rot can affect asparagus and rhubarb.
  
  

Leaf Spot

• Leaf spot is a fungus that causes angular spots on leaves, which will turn from yellow to brown. This can affect carrots and parsnips.
  
  

Root Rot

• Root rot is a fungus that kills off seeds or young seedlings. This can be seen in most vegetable plants started from seed.
  
  

Rust

• An orange-brown fungus, rust causes pustules on leaves and stems and can be seen affecting asparagus, beans, and corn.
  
  

Seed Decay

• Seed decay is a fungus that attacks the roots of seeds and emerging plants. It can affect beans and tomatoes.