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RESEARCH ARTICLE

Attempts to control alternate cropping of Valencia orange by inhibiting flower formation with gibberellic acid

PT Gallasch

Australian Journal of Experimental Agriculture and Animal Husbandry 18(91) 309 - 312
Published: 1978

Abstract

Gibberellic acid (GA) was sprayed on whole Valencia orange trees in 1971 at Loxton in South Australia with the aim of reducing the size of the heavy crop and the alternate cropping cycle. Sprays were applied in June or July at 25 p.p.m. but there was no reduction in mature fruit weights in 1972. In 1973, sprays of GA at 25 p.p.m, were applied twice, about two weeks apart, commencing on either May 7 or 22. In the following November treated trees had 75 per cent fewer fruitlets, but by the time fruit were mature, trees had fully compensated for this early reduction in fruit numbers by increased set and reduced December drop. Again the weight of mature fruit was not reduced at the timings and concentrations used and hence GA cannot be recommended for the control of alternate cropping.

https://doi.org/10.1071/EA9780309

© CSIRO 1978

Committee on Publication Ethics


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