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

RAI report for Middletown (MID)

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: Sauvignon Blanc

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Time Period: February 1, 2025 to March 3, 2025.

Date RAI Disease pressure Pathogen status Hours
70° ≤ Temp ≤ 85° 		Hours
Temp > 95° 		Notes
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 0.1 0.00
02/28/2025 40 N/A Not Present 6.9 0.00
02/27/2025 20 N/A Not Present 6.0 0.00
02/26/2025 0 N/A Not Present 3.7 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