South Dakota State University
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Smallgrains disease model using SDSU Mesonet data

** Data only updated during wheat growing seasons **

Stations: Station locations
Growth Stage:
iGrow

Fusarium Head Blight (Scab)

Forecast model of head blight severity
Interpretation: Model estimates the percent risk of serious head blight. The red values indicate scab is more likely than not. Yellow values indicate a moderate risk of scab and the green values mean that scab is unlikely. First, select the date your field came into flower. Then assess the risk of scab.
For more information on variety response, view the most recent Winter Wheat or Spring Wheat crop performance testing data.

Variety
10/1
10/2
10/3
10/4
10/5
10/6
10/7
10/8
9/29
9/26
9/27
9/30
9/28
Very Susceptible
Susceptible
Moderately Susceptible
Moderately Resistant


Infection periods of tan spot, Stagonospora (Septoria) blotch and leaf rust

Interpretation: Yes = infection likely, No = infection unlikely. First, select the date when 50% of the flag-2 (or flag-1) leaves had disease symptoms. Then, consider a fungicide when 6-8 infection periods ("Yes" days) have accumulated.  (More info from orginal model)
Models
10/1
10/2
10/3
10/4
10/5
10/6
10/7
10/8
9/29
9/26
9/27
9/30
9/28
Tan Spot
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
No
Yes
Yes
No
Blotch
Yes
No
No
No
No
No
No
No
No
No
No
Yes
No
Leaf Rust
No
No
No
No
No
No
No
No
No
No
No
No
No

Weather

Interpretation: Factors that most influence plant diseases are given here to help you mentally adjust for environmental differences between your field and the weather station. More complete environmental information from SD Mesonet are linked below. (More info from orginal model)
Weather
10/1
10/2
10/3
10/4
10/5
10/6
10/7
10/8
9/29
9/26
9/27
9/30
9/28
Rain (in)
0
0
0
0
0
0
0
0
0
0
0
0
0
RH (%)
94
91
93
91
54
55
56
67
82
83
78
81
79
Temperature (F)
17
18
23
30
47
44
44
39
29
27
37
30
28
Wet period (hour)
18
13
19
22
6
3
0
9
12
1
10
23
0

 

The models used in this prediction were originally developed by NDSU Small Grains Program. SDSU takes no responsibility in fungicide application decisions. This is only a guide. Growers should scout individual fields and make their decisions based disease level in comparison to what is being predicted.
For further information or comments, please call 605-688-4521/605-688-6996 or Email:  emmanuel.byamukama@sdstate.edu