Grape Bloom Time Projections

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 obtain your or call 559-275-8095

Email Alerts - In 2010, we continue sending email reminders of activities that growers "should be" doing or at least thinking about during the growing season.
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Last Update 5/14/2012		5/21/2012  Next Update

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 onactual 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.

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