Grape Bloom Time Projections

  
Vine Nutrition & Fertilizer Needs - Bloom time is one of the best times to sample grapevines and determine the status of nutrients.  AgQuest can provide you with a complete laboratory analysis of your bloom time petiole sample along with fertilizer recommendations.  To see a Sample Report click here.

To obtain your Free Petiole Sampling Kit click here or call 559-275-8095


Email Alerts - In 2008, we are sending email reminders of activities that growers "should be" doing or at least thinking about during the growing season. To be included in this Mailing List click here: 
   
Last Update:  July 03, 2008

   Next Update:  March 2009     

Location

Variety

2007

Bud Break

2007 Actual Bloom

2008

Bud 

Break

2008 Predicted Bloom

2008

Actual Bloom

Kern County
Western French Colombard  March 12 April 30 March 12 May 9 May 10
Western Syrah March 15 May 7 March 20 May 15 May 15
Fresno County
Parlier Thompson Seedless March 14 May 9 March 15 May 15 May 13
Kerman Thompson Seedless March 16 May 9 March 15 May 15 May 14
Kerman Merlot March 16 April 30 March 22 May 15 May 15
Kerman Syrah March 17 May 7 March 23 May 15 May 16

Madera County
Central Thompson Seedless March 18 May 9 March 16 May 16 May 14
Central Chardonnay March 12 May 7 March 14 May 11 May 9
Central Merlot March 21 May 7 March 20 May 14 May 12
Central Syrah March 19 May 8 March 23 May 17 May 16

San Luis Obispo County
Paso Robles Cabernet Sauvignon March 17 May 16 March 21 May 24 May 23

Monterey County
King City Chardonnay March 14 May 14 March 3 May 28 May 19
King City Pinot Noir March 17 May 14 March 15 May 31 May 21

Santa Barbara County
Los Alamos

Chardonnay

 March 12 May 11 March 10 May 18 May 16
Los Alamos Pinot Noir March 20 May 18 March 16 May 31 May 20
Research work done the past 30 years has given us
the ability to quite accurately predict when bloom 
will occur for grapevines.  This work is based on the
accumulation of degree-days from bud break to bloom.
The time of bud break depends on the grape growing
area, the specific variety and rootstock.

The number of accumulated degree-days from bud 
break to reach bloom is variety dependent.  For 
Thompson Seedless, 650 to 700 degree-days are
required.  For most wine grape varieties, 500 to 600
degree-days are needed.

For the areas listed above, we have recorded the 
dates of bud break for this season for a "typical vineyard".  The predictions of peak bloom time are based on actual temperatures to date then normal temperatures
until the degree-day total is reached for each variety
listed in each area.  Bloom projections are updated weekly.

 

 

California AgQuest Consulting, Inc.
4545 N. Brawley Avenue
Fresno, CA  93722
Ph. (559) 275-8095  *  FAX (559) 275-5301
e-mail:  consult@calagquest.com

 

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