Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2005
Publication Date: August 1, 2005
Citation: Porter, L. 2005. Use of phosphorous acid to manage common root rot in processing peas. Phytopathology. 96:S93. Technical Abstract: Common root rot, caused by Aphanomyces euteiches, is a major disease of peas worldwide. The effects of phosphorous acid (PA) on dry root and top weight, and plant height, of pea were determined in a greenhouse, when plants were either inoculated or not inoculated, and the seed and foliage was either treated or not treated with various applications of PA. PA applied as a wet seed treatment, in addition to 1, 2, or 3 foliar applications, respectively, beginning at emergence and spaced at 1-week intervals were tested. The dry root weight, dry top weight and plant height of non-inoculated plants were significantly less (P < 0.05) for plants of pea seed treated with PA, than for plants of non-treated seed in 2 of 4 trials. However, dry root weight and plant height of inoculated plants were significantly greater for pea plants with seed treated only with PA than for non-treated seed in 3 of 4 trials. Dry root and top weights, and plant height of non-inoculated plants treated with 1, 2 or 3 foliar applications of PA in addition to a wet seed treatment did not consistently, significantly differ from non-inoculated, non-treated controls among trials. However, inoculated plants receiving foliar treatments in addition to a PA seed treatment were significantly greater in dry top and root weights, and plant height than the non-treated controls in 4 of 4 trials.