SOME EFFECTS OF AVG AND PROMALIN ON BARTLETT AND PACKHAM PEARS
Varying concentrations of aminoethoxyvinyl glycine (AVG), benzyladenine (BA) and gibberellins A4+A7 (GA4+A7) were applied to attached branches of the pear cultivars Bartlett in New York and Packham in Victoria. The 18-year-old Bartlett trees were located in a block with poor provision for cross pollination, and low yields had been the rule. Fruit set and annual yields had been more favorable in the Packham block. The growth regulator applications in both experiments were made when approximately 50% of the flowers were open. The surfactant 'Tween 20' was included in all treatments at 1000 ppm. The materials were applied with a hand sprayer with sufficient volume of spray to thoroughly cover flower and developing leaf surfaces to the drip point. Four to six replicate limb units were used for each treatment. Blossom clusters were counted on representative branches and the number of persisting fruits was determined later for calculating fruit set. Fruit samples were collected at harvest for size and quality evaluation. Return bloom was determined for the Bartlett trees the following spring.
Edgerton, L.J., Veinbrants, N. and Miller, P. (1981). SOME EFFECTS OF AVG AND PROMALIN ON BARTLETT AND PACKHAM PEARS. Acta Hortic. 120, 246-246