A Two-Stage Approach for Estimating the Value of Damage Control with Fungicide in Soybean Production
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Little is known about the profitability of treating soybean infected with frogeye leaf spot (FLS) with a foliar fungicide. We determine the economic effect of total water applied, growing degree days, and foliar fungicide treatment on FLS severity and yield of soybean MG III, IV, and V with a two-stage severity/treatment outcome model. Data were collected from an 11-year soybean fungicide experiment in Tennessee under high, natural disease pressure. The marginal value product and the breakeven price of soybean for applying a foliar fungicide to treat FLS were estimated for each MG. Applying foliar fungicide reduced FLS severity and increased yields for each MG. The results suggest a profit-maximizing producer would apply a foliar fungicide each year to manage FLS.