Green Gage Plum Problem. - Ask Extension
Attaching photographs of disease(?) on a Green Gage plum tree planted in Spring of 2014. I would appreciate if you could identify the problem and adv...
Knowledgebase
Green Gage Plum Problem. #247206
Asked May 26, 2015, 9:57 AM EDT
Attaching photographs of disease(?) on a Green Gage plum tree planted in Spring of 2014. I would appreciate if you could identify the problem and advise as to control/treatment. Thank you.
Butler County Pennsylvania
Expert Response
It looks like Black Knot but I am not sure because of the color of the growths. This publication does describe that, "After infection, a light brown swelling develops late the same year or the following spring."
http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/black-knot-of-prunus
Here is also a link to Penn State's Fruit Production for the Home Gardener where you can find so much information about growing fruit and the most common diseases and insect pests:
http://extension.psu.edu/plants/gardening/fphg/stone/diseases
http://extension.psu.edu/pests/plant-diseases/all-fact-sheets/black-knot-of-prunus
Here is also a link to Penn State's Fruit Production for the Home Gardener where you can find so much information about growing fruit and the most common diseases and insect pests:
http://extension.psu.edu/plants/gardening/fphg/stone/diseases
