Arborist b 480-969-8808Canker


Canker

A localized dead area on a trunk or branch, cankers are caused by everything from mechanical damage inflected by a lawn mower to environmental stress in the form of frost cracks and sunscald to types of fungi and bacteria.

 

 

Damage

On young or smooth-barked trees, the surface of the canker is often discolored and tissue around the canker is enlarged. The size of a canker can range form a small lesion on a branch to a massive dead area on the plant's trunk. Cankers on young trees can kill them. Cankers rarely kill established trees but they may cause serious growth deformities.

Control
Most canker-causing fungi infect stressed or injured trees. The best defense against canker is prevention. Keep trees healthy and prevent infection. In winter, wrap young, thin-barked trees, such as maples and apples, to prevent sunscald and frost cracks. In periods of drought, water trees thoroughly. 

In the case of infectious cankers, remove branches six to 12 inches below the canker. Dead or dying branches should also be removed. Prune during dry weather to minimize the spread of the disease. 

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