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

Chatham Weather and Disease Daily Summary (Report issued 4/18/2024 8:28 )

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 Chatham estimated as 4/14/2024 (110 DD Base 42 after 1/1).
Expansion of first bract leaves in cherry (beginning of risk period) for Chatham 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: 4/4 to 4/18/2024
Rainfall data missing for: 4/21 - 4/24
Rainfall data estimated for: 1/1 - 2/19; 2/22 - 4/17

* 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 4/4 31.7 41.7 36.7 0.11 18.75 -- -- 0 -- -- -- -- --
Fri 4/5 26.6 49 37.8 0 18.75 -- -- 0 -- -- -- -- --
Sat 4/6 25.6 52.1 38.9 0 18.75 -- -- 0 -- -- -- -- --
Sun 4/7 21.2 56.5 38.8 0 18.75 -- -- 0 -- -- -- -- --
Mon 4/8 45.6 58.1 51.8 0.01 18.76 -- -- 0 -- -- -- -- --
Tue 4/9 46.1 47.4 46.8 0.34 19.1 -- -- 0 -- -- -- -- --
Wed 4/10 34.4 66.7 50.5 0 19.1 -- -- 0 -- -- -- -- --
Thu 4/11 41 50.4 45.7 0.17 19.27 -- -- 0 -- -- -- -- --
Fri 4/12 38.1 50.1 44.1 0.33 19.6 -- -- 0 -- -- -- -- --
Sat 4/13 34 58 46 0 19.6 -- -- 0 -- -- -- -- --
Sun 4/14 33.3 57.2 45.2 0.01 19.61 0% 0% 1 4/14 Midnight-1AM to 4/14 Midnight-1AM
Some estimated data used.
Wet: 1
Span: 1		 43.5 None None No risk until pre-bloom period
Mon 4/15 30.9 59.6 45.3 0 19.61 0% 0% 0 -- -- -- -- --
Tue 4/16 26 60.6 43.3 0.17 19.78 0% 0% 2 4/16 6-7AM to 4/16 7-8AM
Some estimated data used.
Wet: 2
Span: 2; 4/16 10-11PM to Ongoing. Last hour with moisture: 4/18 7-8AM
Some estimated data used
Wet: 27
Span: 34		 27.6; 41.8 None; Light (Symptoms appear: 5/22) None No risk until pre-bloom period
Wed 4/17 40.3 46 43.2 0.38 20.16 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 4/18 Actual (7:25-7:30AM): 37.5 Forecast: 55 46.25 3.1896220472441 23.349622047244 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 4/19 33 46 39.5 0.07 23.419622047244 0% 0%
Sat 4/20 31 42 36.5 0 23.419622047244 0% 0%
Sun 4/21 28 52 40 NA 23.419622047244 0% 0%
Mon 4/22 30 57 43.5 NA 23.419622047244 0% 0%
Tue 4/23 35 49 42 NA 23.419622047244 0% 0%
Wed 4/24 30 47 38.5 NA 23.419622047244 1% 0%

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
About apple scab | About cherry leaf spot | About grape black rot
About these models | More weather data for this station