Leaf Spot of Southern Magnolia Caused byPseudomonas cichorii

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Abstract
A new leaf spot of southern magnolia (M. grandiflora) was found to be caused by P. cichorii. Newly unfolded leaves had dark brown lesions covering as much as 2/3 of the leaf area. Symptoms were less severe on older foliage. Pathogenic bacterial isolates from M. grandiflora matched P. cichorii in morphology and physiological and biochemical test results. M. grandiflora, M. macrophylla, M. soulangeana, and M. tripetala developed foliar lesions after artificial inoculation. Sprays of tri-basic copper sulfate (2.4 g/l) or copper hydroxide (1.2 g/l) applied at weekly intervals during periods of active shoot growth suppressed disease. Disease severity was less with ground-level irrigation than with overhead irrigation.

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