Apples, Plant growth regulators.
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There is at present no foolproof and entirely satisfactory stop-drop spray for apples. This is unfortunate as the average grower desires simplicity. To date three materials have been included in experimental work undertaken by the Department of Agriculture namely NAA (alpha naphthalene acetic acid), 245TA (tri ethanol amine salt of 245 tri chloro phenoxy acetic acid) and 245TP (tri ethanol amine salt of 245 tri chloro phenoxy proprionic acid).
""Stop-drop" Sprays for Jonathon apples,"
Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 8:
5, Article 11.
Available at: https://library.dpird.wa.gov.au/journal_agriculture3/vol8/iss5/11