Apples, Thinning, Yields
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Department of Agriculture experiments have shown that biennial bearing of apples can be controlled by chemical thinning, but both winter and spring weather conditions must be taken into account when the need for spraying is assessed.
BIENNIAL BEARING is a regular cycle in which each heavy crop of fruit is followed by a light crop, or, in extreme cases, no crop at all.
Cripps, J E L
"Chemical thinning controls biennial bearing in apples,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 11:
9, Article 7.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol11/iss9/7