Decline of Curbside Sugar Maples in Connecticut    (View PDF)

Saul Rich and Gerald S. Walton

Abstract: Curbside sugar maples in the New Haven area developed decline symptoms and died at an annual rate of 20 to 33%. The severity of symptoms could be correlated with concentrations of sodium in the leaves, twigs, and sap of the trees. Even though symptom severity is negatively correlated with foliage nitrogen, the symptoms could not be alleviated by the application of nitrogen in the root zone. Symptom severity could not be correlated with chloride ion, plant parasitic nematodes, or concentrations of the metallic pollutants lead, zinc, copper, nickel and cadmium. There was significant negative correlation between curb height and symptom severity.

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https://doi.org/10.48044/jauf.1979.064