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I have created a photo index page for major North American tree diseases that infect both conifers and hardwoods. The index is not exhaustive but covers the more important and common diseases in North America. Many of these diseases will gained a foothold on your tree through this summer and should be identified and controlled.


July 13, 2012 at 2:30 pm
(1) neal says:

I have a pinto oak tree that have brown wark like masses on the leaves what is thes and how can I cure it? neal blackman

June 14, 2013 at 11:27 am
(2) Margaret Brown says:

Mainly white blossom cherry trees never had leaves (or a few leaves with holes in) last year 2012 – was told this was due to May frosts – we removed a few too close to houses as they looked very unsightly. Been to study the remaining trees which have more leaves on, but still holes in them and don’t look too good. There is also a silver birch which has only a few leaves – this is close to the remaining cherries.
Wonder if they will all recover, or it is too soon to know? June 2013.

September 14, 2013 at 2:34 pm
(3) Nancy says:

I have a Hawthorn tree (I think). It has pink flowers in spring and red berries in the fall. Something is wrong with it. About a month ago the leaves started turning brown, curling up and dropping off. The berries are there but some have become full of little bumps. What is wrong with it and what should I do?

September 22, 2013 at 4:45 pm
(4) louise allen says:

my oak tree has black specks all over the leaves and something that looks like fur on the top and bottom of leaf the tan fur feels like cotton i think its killing my tree what is it

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