SummaryThree pruning treatments were compared on Worcester Pearmain on M.IV rootstock, viz.: open-centre tree, established-spur pruned; delayed open-centre tree, established-spur pruned; regulated pruned tree. In the fifteenth year secondary treatments were begun, the trees being pruned either annually or in alternate years, with and without fruit thinning by hand. The trees were grubbed after 21 years and scion weights were obtained.There were no important differences in growth and cropping between open-centre and delayed open-centre trees. Regulated trees had an 11% smaller area of branch spread than established-spur pruned trees at 21 years. At 15 years there was no significant difference between treatments in total weight of prunings, but three times as much old wood as new had been removed from regulated trees compared with two and a half times as much new wood as old from established-spur pruned trees. During a 6-year period, the same weight of wood was removed from alternate-year pruned trees as from those pruned annually.During the first 10 years regulated trees yielded twice as much fruit as did established-spur pruned ones, and 49% more during the second 10-year period. In many years, in the absence of fruit thinning, regulated trees bore smaller fruits than did established-spur pruned trees. Regulated trees had more red colour on the fruits than established-spur pruned trees, and alternate-year pruning, whether regulated or established-spur, gave more red colour on the fruits than did annual pruning, especially in seasons following no pruning. Alternate-year pruning had no harmful effect upon fruit size. Fruit thinning had no important effect upon red colour but it increased the percentage crop weight in the larger size grades, especially on established-spur pruned trees. The regulated method is well suited to the growth habit of Worcester provided that the fruit is thinned by hand or chemical spray in years of heavy setting.The relative ratios between total crop : scion weight and crop 15–21 years : scion weight, were similar; scion weights were twice as heavy as weights of prunings.