Monday, May 8, 2017

Bud Dissection & Primary Bud Necrosis

DJ's are specialists in grapevine bud dissection. Bud dissections are used for determining bud fertility to estimate yield potential. They can also show the health status of a vineyard by determining the level of  primary bud necrosis. This is when the primary bud is dead, whilst the secondary buds remained healthy. This phenomenon is known as primary bud necrosis (PBN).





Above - Healthy dissected primary buds. A good sign for next season. Primary buds have on average more inflorescence primordia (what develops into your bunches), of a larger size, than secondary bunches.

A bud beginning to die (go necrotic).

Primary Bud Necrosis (PBN). Note how the centre bud has died but the two secondary buds are viable. This would indicate that secondary buds will burst in place of the larger primary bud.

30 bud samples. 

The big question is can you really get insight into next seasons crop only taking 30x buds per position?


Yes you can. The most common fault with bud dissections is in many cases they tell growers information they already know. Their shoots for next season will have between 1.2 and 1.5 bunches on average and they will prune to spurs that have already been set over the last few pruning seasons.

Occasionally blocks will have problems with fruitfulness and have levels below 1 bunch per bud (inflorescence primordia per bud), or high levels of bud death. It is when you find blocks like these bud dissections come into their own as a vineyard tool.

Contact us for more information on how this can apply to your vineyard. e: matthew@djsgrowers.com.au

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