Journal of the Department of Agriculture, Western Australia, Series 3


Western Australia, 2 4-D, Pre-harvest drop, Navel oranges drop

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An experiment was carried out to test the suitability of combining a 2,4-D hormone spray, to prevent mature fruit drop of Navel oranges, with a routine fungicidal spray of Bordeaux mixture. The hormone was tested at two concentrations. The results of the experiment indicated that under the conditions tested the 2,4-D spray could not be successfully combined with Bordeaux mixture and the concentration of 20 parts per million was superior to 10 parts per million. The lower concentration may be equally effective with a high rate of spray application.