Disease Protection for Higher Yields and Quality

California vineyard weed management

Wine, Table and Raisin Grapes

Grape growers face a variety of tough diseases in the vineyard, from Powdery mildew and Botrytis to Black rot and Phomopsis. Not only do these diseases cause serious losses in crop yield and quality, but they can also overwinter and cause problems on your vines from season to season if left untreated. Preventing, managing and eliminating these diseases is essential to protecting your investment in your wine, table and raisin grapes.

Disease Threats

  • Powdery Mildew If insufficiently controlled, symptoms of Powdery mildew can include red, blotchy areas on dormant canes; chlorotic (loss of greenness) spots on upper surfaces of the leaves; white, powdery or dusty areas; and white, powdery masses settled on the entire berry surface.
  • BotrytisAccording to the University of California Cooperative Extension, Botrytis spores, if left untreated, can infect intact, healthy flowers and shoots during bloom and then develop later as fruit matures, devastating your grape quality and overall crop yield.

Untreated severe Powdery mildew can lead to Botrytis, causing mounting threats for wine, table and raisin grape growers.

Disease Control

  • Treatment – Treatment methods for both diseases are similar, which helps growers maximize efficiency for their fungicide applications and time in the field. To maximize return, growers can select a fungicide that is highly effective on both diseases.
  • Management and Prevention – The University of California, Davis, recommends several practices to manage Botrytis, including: leaf removal, applying fungicides properly, planting resistant varieties and canopy management.

Double Trouble

Powdery mildew and Botrytis bunch rot diseases often go hand in hand in vineyards. Becoming familiar with available treatment options for both diseases can minimize yield loss and quality reduction.


Select a fungicide program that is highly effective on both diseases.

Powdery Mildew Control

In 8 years of running trials, Dr. Gubler of UC, Davis, has shown Luna Experience® at bloom and Flint® to be a top-rated program for grapes.

Dr. Doug Gubler 8-year trial in grapes, UC Davis, CA 2009-2016
Dr. Doug Gubler, University of California (UCCE) Davis, Walnut Grove, CA, 2016. Trials usually included 25 to 30 treatments.

8 Years Highly Effective in
Dr. Gubler trials.

Luna Experience, Flint

Botrytis Control

Trial by Larry Bettiga, UCCE, Salinas Valley, 2013, shows Luna Experience® helped reduce the severity of Botrytis by an average of 75%.

botytis control chart

Luna experience
Helps Reduce Severity of Botrytis by an average of 75%.

Protection Means Profit

Using applications of Luna Experience® at bloom provided +2,333 lb./A in higher yield over grower standard program (Commercial Block, White Hills, CA), which means growers can enjoy +$855/A in additional profits.

Luna Program vs Grower Standard Program
+2,333 il/A in higher yield = +$855/A in additional profit
Botrytis Severity and Incidence in Grape

Applications of Luna® Experience at bloom provided better disease control than Grower Standard Program.

Make Luna Experience® and Flint® a cornerstone of your fungicide program to control tough diseases and help protect your investment in your wine, table and raisin grapes.

» Find out what Luna Experience® and Flint® fungicides can do for you

Pristine and Vivando are registered trademarks of BASF. Inspire Super, Quadris, Switch, and Vangard are registered trademarks of Syngenta. Quintec and Rally are registered trademarks of Dow AgroSciences LLC. METTLE is a registered trademark of Isagro USA, Inc.

Work Cited

1Average yield gain per pound in dollars is based on California Agricultural Statistics Review, 2014–2015, California Department of Food and Agriculture.

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