Abstract
Abstract The gibberellins GA3 (200 ppm) and GA4+7 mixture (50 and 200 ppm) applied to blossoms of Pyrus communis L. cv. Winter Nelis previously bagged to prevent cross-pollination stimulated fruit set and growth for about a month, after which most of the fruits abscissed. Additional GA3 sprays were effective in retaining normal fruits until maturity. The addition of 2-(2,4,5-trichlorophenoxy) propionic acid (fenoprop) further reduced “June drop,” and also advanced maturity and caused breakdown and early preharvest drop of fruits.
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