1994•Unpublished venueRequires access
Effect of Root Infection by Phytophthora citricola on Avocado Root Rot Caused by Phytophthora cinnamomi
Z. A. El-Hamalawi, J. A. Menge
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Abstract
Root systems of Persea indica (1, 2, 5, and 8-mo-old) and Persea americana (2 and 8mo-old) were inoculated with macerated mycelia of Phytophthora citricola and challenged 48 hr later with zoospores of Phytophthora cinnamomi. Partial protection against the root rot disease caused by P. cinnamomi was induced by the prior inoculation of the avocado seedlings with P. citricola. Simultaneous inoculation of the root systems of the plants with both pathogens resulted in less protection against root rot caused by P. cinnamomi. The ability of P. citricola to induce resistance to P. cinnamomi by prior inoculation with P. citricola was greater in the case of 5- and 8-moold plants compared to 1- and 2-mo old seedlings of Persea americana and Persea indica.