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Between 1997 and 1999, 21 biorational products were evaluated for powdery mildew control on dogwood seedlings and compared with the traditional fungicides Banner® (propiconazole), ConSyst™ WDG (chlorothalonil and thiophanate methyl) and Cleary's 3336 F® (thiophanate-methyl) in a shadehouse environment. Selected products were also evaluated in rotation with Banner®, where Banner® application was made once for every three applications. Among the biorational products the household soaps, Palmolive®, Ajax®, and Equate®, the potassium bicarbonate salt Armicarb™, and the antitranspirant Vapor Gard® were most effective in reducing powdery mildew severity. However, Vapor Gard® stunted plant growth, and Palmolive® caused some phytotoxicity. While Safer Soap®, M-Pede®, Triact™, Neem Gold®, Kaligreen™, and Ultrafine® oil were not as effective in controlling powdery mildew as the fungicides, the increase in plant growth was similar. Spray regimes that included the biorational and Banner® generally gave better disease control and enhanced plant growth over the biorational products alone. While Banner® and ConSyst™ were highly effective in controlling powdery mildew, Cleary's 3336 F® gave inconsistent results and proved only moderately effective. Overall, plant growth correlated negatively with powdery mildew severity for the biorational products (r = −0.58) and biorational/Banner rotation (r = −0.54).

Evaluation of Biorational Products for Powdery Mildew Management in Cornus florida