The objective of thinning is to reduce clusters to single fruitlets
on most cultivars, preferably the king bloom fruitlet, and to adequately
space fruit to every other bearing spur. An additional benefit of thinning
is reduced probability of pest damage. Some pests are more likely to
damage clustered fruit.
Early thinning is important. Thinning near bloom or shortly afterward
will increase average fruit size and maximize return bloom the next
year.
Grower experience is the best guide to thinning needs, so it is important
to document the previous thinning history including rates, conditions
at time of application, and results. Other factors include:
Compared to a tree with an excessive crop load, a well-thinned crop
has better colour and is more efficient to harvest, which reduces labour
costs per bin.
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