What deficiency causes black spot on pecan meats? Typically what nutrients are needed for healthy trees and production?
Obion County Tennessee
Black spots on the kernel meat usually indicates feeding by stinkbugs or leaffooted bugs in late summer after the shells harden. Stinkbugs can attack pecans even after the shucks open, so you must watch carefully for them and spray with a recommended insecticide if they are present on the nuts.
Otherwise you generally need to apply nitrogen via the roots on an annual basis. Soil and leaf testing is recommended to ascertain need for other plant nutrients.