A video from crushpad in California detailing the process of crop thinning, something we have been doing here in New Zealand on our vines in order to advance the quality and uniformity of the remaining fruit.
Basically, at veraison, any green fruit, any 'second-set', any green shoulders on any bunch or any bunch with any amount of disease or disorder is dropped to the ground. Often, depending on the varietal, we will also drop the 2nd and 3rd bunches on a shoot as well leaving only the primary bunch. If left on the vine none of these will ripen to the same degree at the primary bunch and this will bring down the overall quality of the crop. Thinning concentrates the flow of photosynthates into the remaining fruit. Up to 50% of the vines crop can be dropped onto the ground, something many growers find hard to watch.
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