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Relationship between magnesium content of alfalfa medicago sativa and stemphylium botryosum leaf spot severity

, : Relationship between magnesium content of alfalfa medicago sativa and stemphylium botryosum leaf spot severity. Plant Disease Reporter 63(9): 741-743

The severity of Stemphylium leafspot was compared in the greenhouse on alfalfa with a Mg content of 0.12-2.00%. Disease severity was significantly and negatively correlated with Mg content, and defoliation was greater in diseased plants at lower levels of Mg. Mg levels exceeding 0.5% reduced disease severity, but at Mg levels of 0.12-0.40%, which are comparable to those of field-grown alfalfa, plants were susceptible to Stemphylium leafspot. It is unlikely that the severity of this disease in the field will be modified greatly by Mg fertilization practices.

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