Diagnosing Foliage Problems

Here's a quick guide to diagnosing common problems with plant foliage.
(Click on an image to view a larger version.)

From left to right: Yellow,   Necrotic Spots,  White Powder,  Light and Dark Green Areas,  Holes or Chewed Areas

1. Yellow
   • Wet soil
   • Low fertility
   • Root rot pathogens
   • Roots cut or damaged
     • Gophers
     • Moles
     • Insects
   • Nematodes
2. Necrotic spots
   • Round spots
     • Fungal leafspot
   • Angular spots
     • Bacterial leafspot
3. White powder
   • Powdery mildew
4. Light and dark green areas
   • Random patterns
     • Virus
   • In rows
     • Nutrient deficiency
5. Holes or chewed areas
   • Insect injury

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