Control of Potato Tuber Rots Caused by Oomycetes with Foliar Applications of Phosphorous Acid

Plant Disease
Dennis A JohnsonJeffrey S Miller

Abstract

Phosphorous acid for control of tuber rots caused by Phytophthora infestans, P. erythroseptica, and Pythium ultimum was applied to foliage of potato cultivars at various application timings and rates under growing conditions in the Pacific Northwest at Othello and Mount Vernon, WA, and Bonners Ferry and Aberdeen, ID in 2001 to 2003. Efficacy was assessed by artificially inoculating harvested tubers. Mean incidence and severity of late blight tuber rot in tubers inoculated with US-8 and US-11 isolates of Phytophthora infestans usually were significantly less when the foliage from which the tubers were obtained was treated with phosphorous acid than when it was not treated at all locations. With two applications of phosphorous acid, late blight tuber rot in the tuber-resistant cv. Umatilla Russet was significantly less than for Ranger Russet. For phosphorous acid at a rate of 9.37 kg a.i./ha, late blight tuber rot control achieved with two applications at 2-week intervals was not consistently improved across locations by making an additional application 2 weeks later. In 2003, incidence and severity of late blight tuber rot did not differ significantly between the rates of 7.49 and 9.37 kg a.i./ha at both Othello and Mount Vernon...Continue Reading

References

Mar 16, 2001·International Journal of Pediatric Otorhinolaryngology·J M TrigliaS Roman
Oct 24, 2008·Phytopathology·A LevinY Cohen

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Citations

Mar 21, 2020·Plant Disease·David H GentBriana J Claassen
Aug 5, 2017·Plant Biotechnology Journal·V Mohan M AcharyPawan K Agrawal
Jul 1, 2012·Plant Disease·Peter KromannGregory A Forbes
Dec 1, 2007·Plant Disease·Camilla B Yandoc-AblesElizabeth M Lamb

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