1. UC IPM
  2. Weather, models and degree days
  3. Grape Powdery Mildew Risk Assessment Index
Weather, models & degree-days

RAI report for Fair Play

The grape powdery mildew risk assessment index (RAI) is useful for determining disease pressure and how often you need to spray to protect the vines. For information on how to use the RAI, see the pest management guideline.

Bud Break Date:

Grape Variety: Sangiovese

On This Page

Time Period: February 1, 2025 to May 7, 2025.

Date RAI Disease pressure Pathogen status Hours
70° ≤ Temp ≤ 85° 		Hours
Temp > 95° 		Notes
05/07/2025
60 high reproduces every 5 days 6.8 0.00
05/06/2025 40 N/A Not Present 9.5 0.00
05/05/2025 20 N/A Not Present 9.7 0.00
05/04/2025 0 N/A Not Present 0.6 0.00
05/03/2025 0 N/A Not Present 0.0 0.00
05/02/2025
40 N/A Not Present 9.7 0.00
05/01/2025 20 N/A Not Present 11.1 0.00
04/30/2025 0 N/A Not Present 3.8 0.00
04/29/2025 0 N/A Not Present 3.8 0.00
04/28/2025 0 N/A Not Present 0.0 0.00
04/27/2025 0 N/A Not Present 0.0 0.00
04/26/2025 0 N/A Not Present 0.0 0.00
04/25/2025 0 N/A Not Present 0.0 0.00
04/24/2025 0 N/A Not Present 0.0 0.00
04/23/2025 0 N/A Not Present 0.0 0.00
04/22/2025 40 N/A Not Present 8.0 0.00
04/21/2025 20 N/A Not Present 8.6 0.00
04/20/2025 0 N/A Not Present 4.8 0.00
04/19/2025 0 N/A Not Present 0.0 0.00
04/18/2025 0 N/A Not Present 0.0 0.00
04/17/2025 0 N/A Not Present 0.0 0.00
04/16/2025 0 N/A Not Present 0.0 0.00
04/15/2025 0 N/A Not Present 0.4 0.00
04/14/2025 40 N/A Not Present 10.9 0.00
04/13/2025 20 N/A Not Present 7.5 0.00
04/12/2025 0 N/A Not Present 0.0 0.00
04/11/2025 0 N/A Not Present 4.5 0.00
04/10/2025 40 N/A Not Present 7.0 0.00
04/09/2025 20 N/A Not Present 8.7 0.00
04/08/2025 0 N/A Not Present 0.0 0.00
04/07/2025 0 N/A Not Present 0.0 0.00
04/06/2025 0 N/A Not Present 0.0 0.00
04/05/2025 0 N/A Not Present 0.0 0.00
04/04/2025 0 N/A Not Present 0.0 0.00
04/03/2025 0 N/A Not Present 0.0 0.00
04/02/2025
0 N/A Not Present 0.0 0.00
04/01/2025 0 N/A Not Present 0.0 0.00
03/31/2025 0 N/A Not Present 0.0 0.00
03/30/2025 0 N/A Not Present 0.0 0.00
03/29/2025 0 N/A Not Present 0.0 0.00
03/28/2025 0 N/A Not Present 0.0 0.00
03/27/2025 0 N/A Not Present 0.4 0.00
03/26/2025 40 N/A Not Present 11.2 0.00
03/25/2025 20 N/A Not Present 8.2 0.00
03/24/2025 0 N/A Not Present 0.1 0.00
03/23/2025 0 N/A Not Present 0.0 0.00
03/22/2025 0 N/A Not Present 0.0 0.00
03/21/2025 0 N/A Not Present 0.0 0.00
03/20/2025 0 N/A Not Present 0.0 0.00
03/19/2025 0 N/A Not Present 0.0 0.00
03/18/2025 0 N/A Not Present 0.0 0.00
03/17/2025 0 N/A Not Present 0.0 0.00
03/16/2025 0 N/A Not Present 0.0 0.00
03/15/2025 0 N/A Not Present 0.0 0.00
03/14/2025 0 N/A Not Present 0.0 0.00
03/13/2025 0 N/A Not Present 0.0 0.00
03/12/2025 0 N/A Not Present 0.0 0.00
03/11/2025 0 N/A Not Present 0.0 0.00
03/10/2025 0 N/A Not Present 0.0 0.00
03/09/2025 0 N/A Not Present 0.0 0.00
03/08/2025 0 N/A Not Present 0.0 0.00
03/07/2025 0 N/A Not Present 0.0 0.00
03/06/2025 0 N/A Not Present 0.0 0.00
03/05/2025 0 N/A Not Present 0.0 0.00
03/04/2025 0 N/A Not Present 0.0 0.00
03/03/2025 0 N/A Not Present 0.0 0.00
03/02/2025
0 N/A Not Present 0.0 0.00
03/01/2025 0 N/A Not Present 0.0 0.00
02/28/2025 20 N/A Not Present 6.4 0.00
02/27/2025 0 N/A Not Present 4.7 0.00
02/26/2025 0 N/A Not Present 0.1 0.00
02/25/2025 0 N/A Not Present 0.0 0.00
02/24/2025 0 N/A Not Present 0.0 0.00
02/23/2025 0 N/A Not Present 0.0 0.00
02/22/2025 0 N/A Not Present 0.0 0.00
02/21/2025 0 N/A Not Present 0.0 0.00
02/20/2025 0 N/A Not Present 0.0 0.00
02/19/2025 0 N/A Not Present 0.0 0.00
02/18/2025 0 N/A Not Present 0.0 0.00
02/17/2025 0 N/A Not Present 0.0 0.00
02/16/2025 0 N/A Not Present 0.0 0.00
02/15/2025 0 N/A Not Present 0.0 0.00
02/14/2025 0 N/A Not Present 0.0 0.00
02/13/2025 0 N/A Not Present 0.0 0.00
02/12/2025 0 N/A Not Present 0.0 0.00
02/11/2025 0 N/A Not Present 0.0 0.00
02/10/2025 0 N/A Not Present 0.0 0.00
02/09/2025 0 N/A Not Present 0.0 0.00
02/08/2025 0 N/A Not Present 0.0 0.00
02/07/2025 0 N/A Not Present 0.0 0.00
02/06/2025 0 N/A Not Present 0.0 0.00
02/05/2025 0 N/A Not Present 0.0 0.00
02/04/2025 0 N/A Not Present 0.0 0.00
02/03/2025 0 N/A Not Present 0.0 0.00
02/02/2025
0 N/A Not Present 0.0 0.00
02/01/2025 0 N/A Not Present 0.0 0.00