Pest Alert: Canker in Landscape Plants

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white oak canker

Flagging branch tips at the end of oak limbs is an indicator of Bot Canker in Oak

 
We have been seeing lots of canker in landscape plants. There are several fungi that infest the stems of trees and shrubs and the infection causes a canker (infected wound) in oak, arborvitae, cherry laurel, Leyland cypress, and many other trees and shrubs. These fungi infect wounds on plants and kills the branch. Wounds can be caused by pruning, storm damage, cold damage, or excessive wetness.
bot canker wounds

Canker wounds cause the branch to swell eventually killing the branch.

There is no real treatment for canker stem diseases. Try to prevent damage to trees. Stressed and wounded plants are more likely to be infested.
Keep dwarf trees and shrubs as open as possible so that they will dry out after rain. Prune to allow air flow in plants. Clean out leaves from the insides of shrubs. Do not bury plants too deep in mulch. Prune out infected branches and fertilize affected trees if needed.
First signs of canker is flagging leaves on affected limb

First signs of canker is flagging leaves on affected limb.

Next, the affected limb will begin to die.

Next, the affected limb will begin to die.

The only action gardeners can take is to cut out dead branches.

The only action gardeners can take is to cut out dead branches.

bot canker on sourwood tree

Branches are girdled by fungal canker in this sourwood.

bot canker

Closeup of canker on sourwood.

bot canker cherry laurel

Fungal canker on cherry laurel

Bot canker cherry laurel

Fungal canker on cherry laurel

Bot canker cherry laurel

Fungal canker on cherry laurel

arborvitae with canker

We have seen many arborvitae with stem cankers due to piles of needles on the inside of the plants piling up and rotting wounding the wood.

dead arborvitae leaves

Clean dead leaves out of plants. Leaves pile up, rot, and damage stems leading to a wound that can be infected by fungi.

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