<p/>To study possibilities for increases of yield of the apple cultivar Cox's Orange Pippin, relevant information was gathered about fruit set and fruit drop, in particular about June drop. The information concerned pollination intensity, amount of fruit set, seed content of the fruit, number of leaves per spur, and the influence of the bourse shoots. Several growth regulators were tested to see whether these can reduce June drop.<p/>The main conclusions drawn from the results of these observations are given in Section 3.1.3. (p. 18). The growth regulators examined were NAA, NAAm, GA <sub><font size="-1">3</font></sub> , GA <sub><font size="-1">4+7</font></sub> , BA and ABA. The experimental results are given in Section 3.2.3 (p. 40). The most interesting finding in the latter part of this work was the promising ability of GA <sub><font size="-1">4+7</font></sub> to reduce June drop.<p/>The factors underlying fruit set, fruit drop, and fruit growth and the possible role of the applied regulators under study are discussed, whereby fruit drop was related with leaf abscission.
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