TY - JOUR AU - Winslow, M. M. AU - Miller, Marvin P. AU - Enderud, Julius TI - Topworking avocado varieties: Evaluation of more satisfactory varieties at Riverside obtained sooner by topworking than by planting new trees JF - California Agriculture JO - Calif Agr Y1 - 1955/12/01 VL - 9 IS - 12 SP - 9 EP - 10 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v009n12p9 AB - Topworking — or topgrafting — to change varieties found unsatisfactory for growing in the avocado orchard at Riverside is used instead of planting a new young tree because a topworked tree comes into production several years sooner and the quality and performance of a new variety can therefore be evaluated earlier. Topworked trees have ranged in age from six to 10 years.