Bunch overexposure causes losses in both productivity and wine quality. Excessive bunch exposure is detrimental to wine quality in warm to hot and sunny climates.
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Factsheets & other resources
The first two phases of the berry development process.
The third phase of the berry development process.
Generally, bunches of grapes do not ripen to maturity if they are removed from the vine before veraison, although some ripening processes do occur before any visible signs of veraison. There are several ways to define ripeness in grapevines, all of which are used in modern viticulture.
On the same site, with identical management practices, different grapevine varieties generally ripen at different rates. This is due to the genetically determined behaviours of the grape varieties, in combination with their interaction with the site. Good varietal selection is important if crucial stages of development are to occur in favorable conditions.
Grapes that are evenly ripened, sound at the time of harvest and cool at delivery are in an ideal condition for winemaking. Uneven ripening can present as bunches that contain small hard berries that remain green while other berries ripen. Bunches may have poor or uneven colouring.
Grapevines developed to survive harsh winters by losing their leaves and shutting down their metabolic processes. Dormancy is therefore the winter survival behaviour of vines grown in temperate areas.
Restricted Spring Growth (RSG) is a condition seenin some vines in spring. It is caused by a range of factors and is not a disease in itself. Symptoms can vary between vines, from site to site and between years depending on the factors impacting on the specific vines, but generally vines affected by the condition exhibit poor growth early in the season.
Understanding grapevine shoot and root growth.