Progress report, 1969… whitewash trials in walnuts

Abstract

WHITEWASH SPRAYS were found beneficial to walnuts in studies conducted during the early 1960's. Sunburn injury to exposed nuts and limbs was reduced with applications of various types of whitewash sprays. Internal temperatures of exposed nuts averaged 2 to 3 degrees lower on whitewashed trees than the unsprayed checks, and there was a greater percentage of large sound nuts on sprayed trees than on unsprayed trees. Only slight differences in kernel color were reported in these early trials. A good whitewash cover on the trees was needed for results.