My approximately 15 y/o grafted pecans produced a nice crop this year, but the single Colby was hit hard by scab, though only on the nut husks and after many of the nuts were filled. I figure about 25% of the Colbys are unusable. The Peruque and Pawnee near that Colby showed minimal infection this year, but I worry about the future. I have a sprayer I can likely use to treat the trees but don’t know when and what to spray. Got info?
Chuck
Further information: I planted five grafted pecans from the Forrest Keeling nursery in 2004 (+/- a year). At that time I could not get Kanza so I settled for a Colby as pollinator for one each of Pawnee and Peruque. Those three trees were planted on part of my property where there were no nearby native pecans. The other two trees, one each of Pawnee and Peruque were planted close to several native pecans. Though Colby is likely not the best pollinator for the other two varieties, things seem to have worked out well as all three of those trees were loaded this year. The other Pawnee also did very well, but the other Peruque cropped only fairly well. It is the smallest of the five trees and is slightly shaded past mid-day, which might be a reason. The Colby is by far the largest of the five grafted trees. I believe all the trees were grafted to Colby root stock. Several years ago the Missouri State Conservation folks offered seedlings of named varieties, including Colby, Posey, Hardy Giant and Herbert. I planted a dozen of those in yet another part of my property and eight survived. I am now in training to see if I can live long enough to see if any of those produce decent nuts.