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

Kalkaska Weather and Disease Daily Summary (Report issued 3/28/2024 10:30 )

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).

McIntosh Green Tip for Kalkaska estimated as 3/25/2024 (110 DD Base 42 after 1/1).
Expansion of first bract leaves in cherry (beginning of risk period) for Kalkaska not reached. Using 4/1/2024 as a default date.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: 3/14 to 3/28/2024
Rainfall data missing for: 3/28; 3/31 - 4/3

* Estimated values are highlighted in BOLD

Day Date Min Temp (°F) Max Temp (°F) Avg temp (°F) Rainfall (in) Rainfall since 1/1 M D Number of Events Wetting
Event(s)-
Duration
(hours)
T AS CLS BLKR Notes: Spray timing, scouting results, growth stage, site observations, etc.
Thu 3/14 32.6 51.1 41.8 0.14 4.07 -- -- 0 -- -- -- -- --
Fri 3/15 27.6 43.2 35.4 0 4.07 -- -- 0 -- -- -- -- --
Sat 3/16 27.9 50.2 39.1 0.02 4.09 -- -- 0 -- -- -- -- --
Sun 3/17 20.7 33.5 27.1 0 4.09 -- -- 0 -- -- -- -- --
Mon 3/18 20.9 27.7 24.3 0 4.09 -- -- 0 -- -- -- -- --
Tue 3/19 25.3 34.4 29.9 0.01 4.1 -- -- 0 -- -- -- -- --
Wed 3/20 17.2 26.7 22 0 4.1 -- -- 0 -- -- -- -- --
Thu 3/21 17.5 31.7 24.6 0 4.1 -- -- 0 -- -- -- -- --
Fri 3/22 19.9 33.3 26.6 0.05 4.15 -- -- 0 -- -- -- -- --
Sat 3/23 13.7 32.9 23.3 0.01 4.16 -- -- 0 -- -- -- -- --
Sun 3/24 13.6 35.7 24.7 0 4.16 -- -- 0 -- -- -- -- --
Mon 3/25 27.3 58.7 43 0 4.16 0% 0% 0 -- -- -- -- --
Tue 3/26 36.5 54.5 45.5 0.31 4.47 0% 0% 1 3/26 4-5AM to 3/27 9-10AM
Wet: 27
Span: 30
40.8 Light (Symptoms appear: 5/16) No risk until first bract leaves have expanded. No risk until pre-bloom period
Wed 3/27 26.6 36.7 31.6 0.02 4.49 0% 0% 1 continuing continuing continuing continuing continuing

Today's data:

Day Date Min Temp (°F) Max Temp (°F) Avg temp (°F) Rainfall (in) Rainfall since 1/1 M D Number of Events Wetting
Event(s)-
Duration
(hours)
T AS CLS BLKR Notes: Spray timing, scouting results, growth stage, site observations, etc.
Thu 3/28 Actual (4:45-4:50AM): 26.5 Forecast: 38 32.25 0 4.49 0% 0% 0 -- -- -- -- --

Forecast data:

Day Date Min Temp (°F) Max Temp (°F) Avg
temp
(°F)
Rainfall
(in)
Rainfall
since
1/1
M D
Fri 3/29 25 43 34 0 4.49 0% 0%
Sat 3/30 25 44 34.5 0.04 4.53 0% 0%
Sun 3/31 25 48 36.5 NA 4.53 0% 0%
Mon 4/1 30 50 40 NA 4.53 0% 0%
Tue 4/2 32 47 39.5 NA 4.53 0% 0%
Wed 4/3 27 44 35.5 NA 4.53 0% 0%

*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.
Note: Infection periods and wetting events listed on the day of the start of the period/event.
T = Average temperature of wetting event
M = Percent of ascospores matured, based on Gadoury et al.
D = Percent of the matured spores that have discharged, based on unpublished model by Dr. Alan Jones.
AS = Apple Scab
CLS = Cherry Leaf Spot
BLKR = Grape Black Rot