Issue with Mars Seedless Grape Plant?

Asked March 23, 2017, 10:28 AM EDT

A customer just brought a Mars Seedless Grape plant to our Extension office in Potter County, Pennsylvania. He is concerned about the liquid balls "bleeding" from the plant. Can anyone tell me if this is a negative issue related to grafting? Or if it's a normal physiological property of the plant?

Potter County Pennsylvania grapes viticulture

1 Response

A condition called "bleeding" can occur if pruning is done and then a warm snap causes the sap to flow. We have had plenty of cold and warm spells this year. If the plant is otherwise healthy, this may be the sap coming from pruning cuts. You can also send your sample and pictures to the Penn State Plant Clinic and get an opinion. Here is a link to their website.

Penn State publishes an extensive guide called "Fruit Production for the Home Gardener" available online as a PDF that might be helpful.