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

Scottdale Grape Leaf Black Rot Report (Report issued 4/25/2024 6:01 )

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 5/28/2018 (800 DD Base 42 after 1/1).
Degree day data estimated for: 5/10; 5/23
Time period assessed for wetting events: 5/28 to 7/9/2018. Events between 6/25 and 7/9/2018 shown.


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 Scottdale 6/26 Noon-1PM 6/26 1-2PM Wet: 2
Span: 2		 69.9 0.03 None 29%
2 Scottdale 6/27 Midnight-1AM 6/27 11AM-Noon Wet: 12
Span: 12		 68.3 0.82 Yes 150%
3 Scottdale 7/1 8-9PM 7/2 6-7AM Wet: 11
Span: 11		 73.1 0.34 Yes 155%
4 Scottdale 7/5 1-2AM 7/5 7-8AM Wet: 7
Span: 7		 72.5 0.06 Yes 100%

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