Skip to main content
Select Start Date:
Select End Date:
  • Michigan State University Extension
  • Michigan State University Ag Bio Research
  • Project GREEEN

East Lansing (MSUHort) Grape Leaf Black Rot Report (Report issued 4/24/2024 11:59 )

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 5/29/2015 (800 DD Base 42 after 1/1).
Degree day data missing for: 4/29Degree day data estimated for: 4/29
Time period assessed for wetting events: 5/29 to 6/30/2015. Events between 6/16 and 6/30/2015 shown.


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 East Lansing (MSUHort) 6/14 3-4AM 6/16 7-8AM Wet: 43
Span: 53		 70.6 1.86 Yes 572%
2 East Lansing (MSUHort) 6/17 4-5PM 6/18 4-5PM Wet: 24
Span: 25		 68.2 0.79 Yes 307%
3 East Lansing (MSUHort) 6/22 2-3PM 6/23 6-7AM Wet: 13
Span: 17		 72.4 2.15 Yes 182%
4 East Lansing (MSUHort) 6/27 2-3AM 6/27 6-7PM Wet: 17
Span: 17		 58.9 0.91 Yes 156%
5 East Lansing (MSUHort) 6/30 2-3PM Ongoing. Last hour with moisture: 7/1 11PM - Midnight Wet: 10
Span: 10		 67 0.72 Yes 122%

About grape black rot | About this model | More weather data for this station