Pacific Northwest 1998 An Online Guide to Plant Disease Control

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Apple -- Crown Gall
See Also: Cherry -- Crown Gall
 

Unknown galling problem on the 'Mark' rootstock. Seen when new trees begin to fruit.

 
Notes: In the Pacific Northwest, Malling 7 is considered the most susceptible apple rootstock to Agrobacterium tumefaciens, followed by Malling 9 and 26.

The Mark rootstock, susceptible to Agrobacterium, has another problem that resembles crown gall. The cause of this other gall is not known but appears to be genetically inherited in this particular rootstock. (See Good Fruit Grower 44 (15):21-24 for more information.)
Biological control: Crown gall on apple has been much more difficult to control than on Prunus species. Agrobacterium radiobacter K84 has been largely ineffective against apple crown gall unless disease pressure is low.
Content edited by: Jay W. Pscheidt on January 1, 2009
 
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