Submitted to: Pulse Pipeline
Publication Type: Popular Publication
Publication Acceptance Date: March 1, 2008
Publication Date: March 21, 2008
Citation: Porter, L. 2008. Phosphorous acid for Aphanomyces control. Pulse Pipeline. 8(14):1.
Aphanomyces root rot of peas, caused by Aphanomyces euteiches, is a major Oomycete plant pathogen found in many pea growing areas of the United States, northern Europe, Australia, New Zealand and Japan. In the Pacific Northwest of the United States, 100% field losses have been reported. Phosphorous acid is believe to help manage Aphanomyces root rot on peas by inducing a natural defense response in the plants to this root rotting pathogen. A single application rate of 2.5 pints/acre of phosphorous acid applied to pea foliage at the third node growth stage of various dry pea cultivars commonly grown in the Pacific Northwest was successful in helping to manage A. euteiches under greenhouse and field conditions. Growers may choose to apply this product to their entire field or selectively in low lying areas in fields where Aphanomyces root rot is more prominent.