The greatest increase in length to diameter (L/D) ratio of apple (Malus domestica Borkh.) following microdroplet application of gibberellins A4+7 plus 6-benzylamino purine (GA4+7 + BA) occurred when this mixture was applied in the calyx or on the receptacle surface. Movement of GA4+7 + BA to the receptacle from surrounding flower parts or spur leaves was limited. No GA4+7 + BA treatment of 25-600 ppm (0.625-15 μg GA4+7 + BA/flower) influenced fruit set or increased fruit weight. Increased L/D ratio was due to a combination of increased fruit length and decreased fruit diameter. Reduced fruit diameter and weight were attributed to a lower seed number.
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