Everything about Biennial Bearing totally explained
Biennial bearing (or alternate) bearing is a term used in
pomology to refer to trees that have an irregular crop load from year to year. In the "on" year too much fruit is set, leading to small fruit size. Excess weight in the main branches can be too much for their mechanical resistance, causing them to break. Another major consequence is that
flower induction will be lower, and the subsequent year will be "off" year (too little fruit).
The behavior could be due to
plant hormones, particularly
gibberellins produced in excess in the "on" years in the
embryos of the young fruit. It could also be caused by depletion of
carbohydrate reserves in the tree.
Biennial bearing is more common in certain
fruit crops like
apricot and
avocado, and almost non-existing in
grapes.
Horticultural management
This disorder can be reduced by winter
pruning, and
thinning of
flowers and young
fruit.
Further Information
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