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Major Nutrient Influence on Verticillium Dahliae Infections of Acer Saccharum

Little is known about the influence of N, P, and K on the growth and movement of Verticillium in the vascular systems of woody plants. Nutrient-depleted Acer saccharum trees were fertilized with six treatment preparations containing varying concentrations of N, P, and K. Following the response of the trees to the fertilization, the trees were inoculated with Verticillium dahliae. Growth response of the trees to fertilization and the extent of colonization of the trees by the pathogen were determined. Growth of the trees was correlated to the concentration of nitrogen in the fertilizer and was described by the regression equation Y = 76.71 + 1.16X (r = 0.306). Phosphorus was not correlated to new growth of the trees. The effect of potassium was negatively correlated to growth and was described by the regression equation Y = 129.98 - 2.25X (r = -0.456). The concentration of potassium was significantly correlated to the colonization of inoculated trees with the relationship described by the regression equation Y = 100.7 - 2.141X(r = -0.579). Nitrogen and phosphorus concentrations were not correlated to pathogen colonization of inoculated trees.