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THE INFLUENCE OF CALCIUM ON SAPROPHYTIC GROWTH AND PATHOGENICITY OF PHYTOPHTHORA CINNAMOMI AND ON RESISTANCE OF AVOCADO TO ROOT ROT

J A Duvenhage, J. M. Kotzé

Abstract

The effect of calcium on saprophytic growth and pathogenicity of Phytophthora cinnamomi Rands was studied as well as the influence of calcium on the resistance of avocado to root rot caused by the pathogen. Saprophytic growth of the pathogen was increased significantly by calcium, although the pathogenicity of the fungus was not influenced significantly. Ungrafted Edranol, Duke 7 and Martin Grande (G755) trees showed a significant decrease in susceptibility to Phytophthora cinnamomi when treated with calcium sulphate (as well as with calcium carbonate for Edranol). The same tendency (although not significant) was observed when these rootstocks were grafted with Hass.

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Key concepts: Phytophthora cinnamomi, Pathogenicity, Root rot, Biology, Calcium, Rootstock, Phytophthora, Pathogen