Spur Pruning: Growth points are established along a permanent arm or cordon and consist of a 2 or 3 bud spur which will provide the fruiting shoots for that year.
Spur pruning is often used in tandem with mechanical pre-pruners to remove large volumes of pruning wood, keeping pulling out costs down.
However, spur pruning does impact bud fertility, therefore is best used with varieties that have a high basal bud fertility.
Assessing a grapevine’s vigour is essential when pruning. Retaining too many buds, will result in weak growth that will affect the vines ability to ripen.
Leaving too few buds will lead to lower yields and overly strong growth that can affect the cane choices and yield for the following year. When assessing grapevine vigour it’s important to step back and get an overall view of how well the vine has grown, particularly looking at the number of shoots that have successfully grown from the buds that were left the previous year.
Cane number, node number, internode length and cane thickness all play an important part in determining how best to balance vine vigour.
Some vineyard managers will measure pruning weights against cropping weights and indexes to ascertain the bud number to leave, where others will simply complete a charge count, scoring shoots to acquire a total score that will relate to a bud number that should be left.
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