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Efficacy of phosphite soil drenching in the control of Phytophthora cinnamomi in forest and rehabilitated mine site soils
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Efficacy of phosphite soil drenching in the control of Phytophthora cinnamomi in forest and rehabilitated mine site soils

W.A. Dunstan, G.E.St.J. Hardy, R. Daniel, B.L. Shearer, J.A. McComb, I.J. Colquhoun, P.A. O'Brien and B. Dell
Proceedings of the 3rd International (IUFRO) Conference on Phytophthora in Forests and Natural Ecosystems (Freising, Germany, 11/09/2004–18/09/2004)
2006
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Poster Open Access

Abstract

Plots within a forest site and adjacent rehabilitated mine site were artificially inoculated with Phytophthora cinnamomi (infested stem sections). Phosphite, as KOH neutralised phosphorous acid, was applied as a soil drench at 294, 1168 and 1766 g-1 m,-2 P03 . Survival of P. cinnamomi inoculum was assessed at 10, 20 and 30 d post phosphite treatment, and growth of the pathogen into the soil was assessed at 30 d. The experiment was conducted in early winter and repeated in the spring. In winter, Phytophthora was never recovered from inoculum from plots of either soil type treated at the highest rate. In the spring, P. cinnamomi was recovered from inoculum in all treatments, with the exception of forest soil at the two highest rates of treatment, and was never recovered from soil of either type at the highest rate. After the first harvest, the trend was for increasing rates of recovery of P. cinnamomi in most treatments, including the soil-treatment combinations where P. cinnamomi appeared to have been eliminated. Phosphite drenching suppressed, but did not eliminate, P. cinnamomi. Results of a separate experiment showed that, in both soil types, sorption of a significant proportion of phosphite occurred within hours of application.

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