Effect of Promalin, benzyladenine and cyclanilide on lateral branching of apple trees in the nursery
2014
Robinson, T. L. | Sazo, M Miranda
Field experiments were conducted at Wolcott, New York, USA in 2011 and at Quincy, Washington, USA and San Fernando, Chile in 2012 where we compared the effect of summer sprays of varying doses and number of Promalin, benzyladenine (MaxCel or Cylex) or cyclanilide (Tiberon) on the number, length and angle of lateral branches of several apple cultivars. Cyclanilide sprays stimulated significant lateral branch formation but caused a rapidly reduction in terminal shoot elongation rate and a significant reduction in final tree height. This effect was dose dependent and the negative effects on tree growth were more evident in NY State than in Washington State. This was likely due to greater shoot growth rate in Washington than New York. MaxCel and Promalin each induced significant number of lateral branches but did not slow shoot growth rate as significantly as Tiberon thus had a smaller negative effect on final tree height. The angle of lateral branches was more acute with Promalin than with MaxCel. The number of lateral branches was increased with increasing number of sprays (up to 3 sprays in New York State and up to 5 in Washington and Chile). Some trees in Washington had more than 20 lateral branches. There was little difference in the two rates of MaxCel (500 mg/L and 1,000 mg/L). There were significant variety effects with 'Gala', 'Fuji', 'McIntosh’ and 'Empire' producing more lateral branches than 'Macoun'.
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