Abstract
Abstract Sprays of silver nitrate (AgNO3), aminoethoxyvinylglycine (AVG) and gibberellins A4+7 (GA4+7) plus 6-benzylamino purine (BA) were applied with 0.1% Triton B-1956 at bloom to ‘Richared Delicious’ apple trees (Malus domestica Borkh.). AVG at 200 ppm alone or when applied with 50 ppm each of GA4+7 and BA increased fruit set whereas GA4+7 plus BA applied alone at 50 ppm caused fruit thinning. AVG reduced endogenous ethylene production and overcame the increased ethylene production brought about by GA4+7 plus BA application. AVG applied alone at 200 ppm or when combined with GA4+7 plus BA reduced fruit size and increased the L/D ratio at harvest.
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