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

Richville / Frankenmuth Disease Report: Wetting events since 3/14 (Report issued 3/28/2024 19:55 )

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).

Time period assessed for wetting events: 3/12 to 3/28/2024. Events between 3/14 and 3/28/2024 shown.


Wet Period Station Start of wetting period End of wetting period Duration (Hrs.) Avg temp (F) Rainfall (in.) Apple Scab (leaf) Cherry Leaf Spot Grape Leaf Black Rot
1 Richville / Frankenmuth 3/14 1-2PM 3/16 6-7AM Wet: 35
Span: 42
38.4 0.65 Light (Symptoms appear: 4/24) None. No risk until first bract leaves have expanded. No risk until pre-bloom period
2 Richville / Frankenmuth 3/17 1-2PM 3/17 2-3PM Wet: 2
Span: 2
34.2 0.02 None None. No risk until first bract leaves have expanded. No risk until pre-bloom period
3 Richville / Frankenmuth 3/22 2-3PM 3/23 2-3PM Wet: 24
Span: 25
25.2 0.27 None None. No risk until first bract leaves have expanded. No risk until pre-bloom period
4 Richville / Frankenmuth 3/26 6-7AM 3/26 7-8AM Wet: 2
Span: 2
47.4 0.08 None None. No risk until first bract leaves have expanded. No risk until pre-bloom period
5 Richville / Frankenmuth 3/26 6-7PM 3/26 9-10PM Wet: 4
Span: 4
51.8 0.21 None None. No risk until first bract leaves have expanded. No risk until pre-bloom period

*NOTE: Infection is predicted with fewer hours than listed in the 'Wet hrs @ avg temp' column. This can happen when there are falling temperatures. Infection may have occurred early in the period during warm temperatures, but the colder temperatures later in the period decrease the number displayed as the average temperature for the period.