Karl and CJ noticed some spots on Chambourcin grapevines this morning. We asked Laszlo what it might be and at this point he thinks it is "Rupestris Speckle", a physiological spot that occurs in certain conditions on cultivars that have Vitis rupestris as an ancestor. Although the parentage of Chambourcin is not clear cut, we think at this point it has some V. rupestris in its … [Read more...] about Spots on Chambourcin