CHEMICAL INDUCTION OF BRANCHING IN NURSERY TREES
A mixture of methyl esters of the C6, C8, C10 and C12 fatty acids has been successfully used to stimulate branching of several cultivars of apple, pear and plum. Concentrations within the range of 20, 000 to 30, 000 ppm have been most effective in killing the shoot tip and stimulating branch production, but with apple varietal differences in response have been shown. The number of branches produced was similar when the spray was applied in early June or late July, but longer branches were produced by the earlier treatment. Wider branch angles were produced when the shoot tip was temporarily checked, but not killed. Removal of the shoot tip by hand also caused production of branches, but these were fewer in number and had narrower angles than those produced by sprayed trees. Sweet cherry was unaffected by the treatment.
Quinlan, J.D. and Preston, A.P. (1973). CHEMICAL INDUCTION OF BRANCHING IN NURSERY TREES. Acta Hortic. 34, 123-128