Tests with pear on P. communis L. and ‘E. M. Quince C’ (Cydonia oblonga Mill.) rootstocks showed that early fruit thinning to 1 fruit per cluster increased ultimate % fruit set of ‘Comice’; thinning to 2 fruits per cluster did not increase ultimate set Limb girdling 3 weeks after bloom did not effectively increase set, but when used in combination with cluster thinning, increased ‘Anjou’ set beyond either treatment alone. Heading-back pruning of ‘Comice’ on ‘Quince C’ in a high density plot increased both fruit set and ultimate yield relative to thinning-out pruning.
Received for publication April 1, 1974. Ore. Agr. Expt. Sta. Tech. Paper No. 3793.