The break-even, in bushels
Bushels needed = total cost per acre ÷ crop price. Example: a $12/acre application plus $10/acre product = $22 ÷ $4.20 corn = 5.2 bu/acre to break even. Now the honest question: does the trial evidence support ≥5.2 bu in this field, with this disease pressure? Corn fungicide averages ~+5 bu when disease is present — which means at these prices it's a coin flip absent real pressure, and a clear win with it.
Why thresholds move
- Crop price up → threshold drops (protecting bushels is worth more).
- Application cost down → threshold drops.
- Late season / low remaining yield potential → threshold rises; less left to protect.
- Susceptible hybrid, wet forecast, history of the disease → effectively lowers your action point.
Insects vs disease: different math
Insect thresholds are countable (aphids per plant, % defoliation) — use published numbers. Fungicide decisions are probabilistic: you're buying insurance against pressure that may or may not arrive. Weight by hybrid susceptibility, canopy humidity, disease history, and the forecast — and be willing to skip.
Three questions before you commit
- What's my break-even in bushels at today's price and total cost?
- Is the pest actually present, above threshold, with yield left to protect?
- If I'm wrong, what did it cost — and does spraying now hurt resistance or beneficials?
Price the pass in ten seconds with our quote tool, then run the value in the ROI calculator.
Use current published thresholds from your extension service; yield-response averages vary widely by year and pressure.
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