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

Benton Harbor (SWMREC) Grape Leaf Black Rot Report (Report issued 4/25/2024 18:27 )

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 not reached. Using 5/1/2024 as a default date.
Time period assessed for wetting events: 4/11 to 4/25/2024.
Hourly weather data missing for: 4/16/2024 9-10AM (1 hour); Total of 1 missing hours
Hourly weather data estimated for: 4/16/2024 9-10AM (1 hour); Total of 1 estimated hours
Select leaf wetness sensor for analysis:
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 Benton Harbor (SWMREC) 4/11 3-4AM 4/12 10-11AM Wet: 31
Span: 32		 46.8 0.48 No risk until pre-bloom period 4%
2 Benton Harbor (SWMREC) 4/17 1-2AM 4/17 1-2AM Wet: 1
Span: 1		 54.6 0.09 No risk until pre-bloom period 4%
3 Benton Harbor (SWMREC) 4/17 10-11AM 4/17 Noon-1PM Wet: 3
Span: 3		 62.7 0.15 No risk until pre-bloom period 32%
4 Benton Harbor (SWMREC) 4/18 10-11PM 4/19 5-6AM Wet: 8
Span: 8		 44.3 0.34 No risk until pre-bloom period 0%
5 Benton Harbor (SWMREC) 4/23 9-10PM 4/23 10-11PM Wet: 2
Span: 2		 52.3 0.03 No risk until pre-bloom period 8%

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