The Use of Plant Growth Regulators for Branching of Nursery Trees in NY State Mario Miranda Sazo1 and Terence L
The Use of Plant Growth Regulators for Branching of Nursery Trees in NY State Mario Miranda Sazo1 and Terence L. Robinson2 1Cornell Cooperative Extension, Lake Ontario Fruit Program, Newark, NY 2Department of Horticulture, Cornell University, Geneva, NY he quality of nursery trees has a large impact on early pro- the use of Maxcel has been adopted by Italian nurserymen and is a duction and profitability of high density systems. Today, key step for the successful production of well feathered “knip-boom” nurserymen are not only asked to produce trees of good cali- apple trees. Depending on cultivar, Italian nurserymen apply from 1 T per but also highly to 4 Maxcel treatments with spray intervals of 5-7 days depending A new plant growth regulator, cyclanilide branched trees for on temperatures after application (Dr. Walter Guerra, Italy, personal “ the Tall Spindle communication). Since 2009, a new branching agent, cyclanilide (Tradename=Tiberon) very effectively system with short, (Tiberon formulated by Bayer Environmental Science, N.C. USA), induced lateral branching in nursery well positioned lat- has been available in the US for use in outdoor nurseries of apple, trees of 4 apple cultivars in the warm eral branches with sweet cherry, pear, and plum in Florida, Idaho, Oregon, Michigan, and humid year of 2010 in NY State. wide crotch angles. and Washington States. It is not currently registered for tree fruit This has required nursery use in New York State, Europe, or elsewhere. However, it also stopped shoot growth nurseries to im- Studies of the effects of Tiberon for branch induction of nursery for several weeks and reduced final prove their man- apple trees (and other fruit species) were conducted by Dr.
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