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ProCrop |
Foliar Fungicide Decision Aid for Wheat Leafspot Disease (For Cultivars Susceptible to Leafspot Fungi)
| Factor | Suggested Points | Value |
| Market price/bu | $2.00 - $2.50 $2.51 - $3.00 $3.01- $4.00 $4.01 - $5.00 $5.01 > |
1 3 5 6 7 |
| Previous Crop | Wheat with stubble
Wheat w/o stubble Barley Other |
4 2 1 0 |
| Tan spot or Septoria leaf spot development | ||
| If scouting at: | Location of leaf spots | |
| Feekes growth stage | ||
| 6-8 (jointing to early flag leaf emergence) (F= flag leaf, F-1 = leaf below flag leaf) | No leaf spotting
Lower leaves (F-5, F-6) Mid leaves (F-3, F-4) Upper leaves (F-1, F-2) |
0 2 3 4 |
| 9-10 (early flag leaf to boot) | F-4 F-3 F-2 F-1 |
1 3 4 5* |
| 10.1-10.5 (heading) | Lower leaves F-3, F-4 F-2 F-1 |
Don't spray 1 2 4* |
| Yield Potential* | <30 bu/ac 30-35 bu/ac 35-40 bu/ac 41-50 bu/ac 51-60 bu/ac >60 bu/ac |
Don't spray 0 1 2 3 4 |
| * Don't spray if flag leaf heavily diseased.
** Don't spray fields heavily stressed or damaged due to factors other than disease (such as heat, drought, hail) |
||
| Climatic conditions: based on past 2 weeks and a one week forecast. Select from one below that most closely resembles average conditions. Temperature should be average daytime temperature. | |||
| Temperature Moisture and Relative Humidity | |||
| (F) | Dry | Average | Wet |
| 50-60 | 0 | 0 | 0 |
| 60-70 | 0 | 1 | 3 |
| 70-80 | 0 | 2 | 4 |
| 80> | 0 | 1 | 2 |
| Sum Total of 5 Factors | |
| Recommendation If Sum Total Is: | |
| < or = 13 points | Do not spray |
| 14-16 Points | Spray may be beneficial |
| > or = 17 points | Spray fungicides (4 oz Tilt at Feekes stage 8 or 2 lbs mancozeb at Feekes 10-10.5). If applying mancozeb reassess field 10 days after first application and determine point value. If below 16, do not spray second application. |
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