The effect of foliar and soil magnesium application on bacterial leaf spot or peppers

The effect of foliar and soil magnesium application on bacterial leaf spot or peppers

1982

A:PS

`Early Cal Wonder` pepper plants wer grown in Myakka fine sand amended with calcium carbonate or dolomite. Plants in five boxes of each liming treatment were sprayed weekly with MgCl2 (2.4 g/l). Inoculation consisted of infiltration of Xanthomonas campestris pv. vesicatoria (XV) at 8 x 1.0E3 CFU/ml in leaves (one leaf per plant) in each treatment in early October and later in November the same plants were mist inoculated with XV at 1.0E8 CFU/ml. With both inoculation techniques disease was most severe on plants grown in dolomite that were sprayed with Mg. Non sprayed plants grown in dolomite amended soil or Mg sprayed plants grown in CaCO3 amended soil had the lowest disease severity. Tissue analysis revealed that magnesium levels were positively correlated with disease development. [AS]

v.72(7):935, PHYTOPATHOLOGY

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