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Tree diseases

  • All resources in tree diseases 256
  • Environmental factors and damage 117
  • Fertilization and soil management 3
  • General information 9
  • Insects and pests 122
  • Plant health care 171
  • Tree management and consulting 18

After removing a tree, how deep should one remove the stump in order to plant a new tree?

You want to select a spot that’s at least five feet from the old site, which will improve the chances of your new tree...

Plant health care
Insects and pests
Tree diseases
Environmental factors and damage

Algal leaf spot

Canada, Great Britain, Ireland, United States

Algal leafspot is a common disease caused by a parasitic alga, Cephaleuros virescens. This pathogen disfigures…

Tree diseases

Anthracnose

Learn about Anthracnose

Tree diseases

Anthracnose technical report

Canada, United States

Anthracnose is a term applied to a group of foliage diseases that affect many deciduous tree and shrub species throug…

Tree diseases

Apple scab

Learn about Apple scab

Tree diseases

Apple scab technical report

Canada, United States

Scab is a leafspot disease that causes premature defoliation of crabapple and apple. Other species in the rose family…

Tree diseases

Are black tar spots on maple leaves harmful to the maple tree?

The black spots are a leaf disease called tar spot. It is not harmful to the tree.

Plant health care
Tree diseases

Are bore holes and bark splits in my mulberry caused by termites?

Have you "Pollarded" your Mulberry annually to maintain the size? Do you know approximately how old your tree is?...

Plant health care
Insects and pests
Tree diseases
Environmental factors and damage

Armillaria root rot

Canada, United States

Armillaria root rot, also known as shoestring root rot and oak root fungus, is one of the most common root diseases o…

Tree diseases

Ash yellows

Canada, Great Britain, Ireland, United States

Ash yellows (AY) is a chronic, systemic disease that affects many North American ash species. White ash and green ash…

Tree diseases
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