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  • Michigan State University Extension
  • Michigan State University Ag Bio Research
  • Project GREEEN

Berrien Springs Grape Leaf Black Rot Report (Report issued 4/24/2024 21:18 )

Wetting periods start with rainfall (at least 0.01 inch) and continue until the start of at least eight hours without moisture (rainfall, leaf wetness, high relative humidity). Wetting periods are classified as "ongoing" until eight consecutive dry hours have passed. After that, the official end of the wetting period is recorded (the start of the 8 hour dry period).

Black rot model available after 4/15. Pre-bloom estimated as 5/29/2013 (800 DD Base 42 after 1/1).
Degree day data estimated for: 5/21; 5/28
Time period assessed for wetting events: 5/29 to 6/24/2013. Events between 6/10 and 6/24/2013 shown.
Hourly weather data missing for: 6/11/2013 4-5AM - 6/11/2013 8-9AM (5 hours); 6/13/2013 5-6AM - 6/13/2013 6-7AM (2 hours); 6/15/2013 2-3AM - 6/15/2013 4-5AM (3 hours); Total of 10 missing hours

Wet Period Station Start of wetting period End of wetting period Duration (Hrs.) Avg temp (F) Rainfall (in.) Grape Leaf Black Rot Progress toward infection
1 Berrien Springs 6/10 Midnight-1AM 6/10 8-9AM Wet: 9
Span: 9		 66.2 0.16 Yes 110%
2 Berrien Springs 6/12 8-9PM 6/13 7-8AM
Some estimated data used.		 Wet: 12
Span: 12		 65.8 0.39 Yes 143%
3 Berrien Springs 6/15 1-2PM 6/16 7-8AM Wet: 12
Span: 19		 67.2 0.07 Yes 147%
4 Berrien Springs 6/17 8-9PM 6/18 8-9AM Wet: 12
Span: 13		 61.9 0.19 Yes 122%
5 Berrien Springs 6/21 4-5PM 6/22 1-2AM Wet: 7
Span: 10		 68.4 0.14 None 89%
6 Berrien Springs 6/24 8-9PM Ongoing. Last hour with moisture: 6/25 11PM - Midnight Wet: 4
Span: 4		 68.3 0.04 None 52%

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