Abstract
Phosphonic acid was evaluated as a control for Phytophthora root rot in processing tomatoes in greenhouse and field experiments. The chemical was effective in reducing the incidence and severity of root rot in greenhouse tomato seedlings at a rate of 10 g a.i./L and protected seedlings for at least 8 weeks. In the field, the application of phosphonic acid increased yields of tomatoes and significantly reduced root rot severity.
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