Saturday, February 24, 2018 E-MAIL:

Grape Bud Analysis


              We Do This                                                So You  Can

Count bunches per bud.                          Adjust pruning decisions.
                                                                   Reduce thinning costs.
                                                                   Leave extra spurs or canes.

Diagnose fruitfulness problems.           Consider carbohydrates.                                                        Consider nutrition.
                                                                  Be aware of pathogens or stress.
                                                                  Assess frost damage.
                                                                  Control bud mites.

Estimate relative bunch size.                 Compare size year to year.                  


In grape bud analysis, our inspectors dissect buds under a microscope to count the tiny bunch primordia that will become next year's crop.  If you choose, we will also estimate the relative size of the primordia.

When we find high fruitfulness, our growers can safely minimize the number of spurs or canes they leave on the vines after pruning.  This reduces thinning costs in the spring.

When we find unusually low fruitfulness, our growers are forewarned to modify their pruning to add more bunches by leaving more or longer spurs and canes.

When vineyards suffer from low production, our analysis of unfruitful buds provides clues about the causes, which may stem from failed inflorescence, bud necrosis, some kind of stress, bud mites, or disease.

In vineyards infested with bud mites, we count the percent of buds infested and the level of damage to the bunch primordia.

Links to More Information

       Sampling and Shipping                        Reports
Contact about shipping                         How are the results reported?
What is the cost?                                  How accurate are the results?
How to take samples                            How do we rate bunch size?
Where to send samples                            Understanding results
How many samples to send                 Categorizing unfruitfulness
Will Bio Ag collect samples?                Grapevine physiology and fruitfulness
Sampling summary (pdf)                      Pathogens and stress
                                                             Fruitful and unfruitful bud photos


To arrange for bud analysis, or find out more information, contact our Bud Analysis Manager:

Rob Weaver
cell: 559-977-2563


Grape Bud Analysis