Effect of paclobutrazol on growth, flowering, fruit setting, fruit quality and yield of apple cv. Anna and Ein Shemer

Phichit Sripinta

Effect of paclobutrazol on growth, flowering, fruit setting, fruit quality and yield of apple cv. Anna and Ein Shemer

1990

Phichit Sripinta

Paclobutrazol treated plants produced shorter new shoot/10 square cm trunk cross section area than that in the control plants. Paclobutrazol applied as soil drenching and as foliage spray in the late vegetative stage in the Anna and Ein Shemer cultivars produced early flowering than those of the control trees. Whereas the foliage sprayed at 2 weeds after petal fall in the Ein Shemer cultivar and the soil drenching method at the late vegetative stage in the Anna cultivar caused late flowering. The paclobutrazol applied trees had higher number of spurs, more flowers per tree, higher percent fruit set, greater fruit weight per 10 square cm trunk cross section area, higher fruit firmness at harvest and later harvesting time than those of the control trees. The soil drench and foliage spray methods of the Ein Shemer at the late vegetative stage and foliage spray method in the Anna at the 2 weeks after petal fall produced lesser characters in fruit width, fruit length and fruit weight than those of the control trees. But the foliage sprayed Anna trees at the late vegetative period as well as in the Ein Shemer trees at 2 weeks after petal fall caused an increase in fruit width, fruit length and average fruit weight. The higher concentration of paclobutrazol the more fruit colour development was found.

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