Dioecy and herbivory&colon; the effect of growth rate on plant defense in Acer negundo. "Acer negundo" pollen is a severe allergen. The larvae feed on "Fraxinus" species and "Acer negundo". The cottony maple leaf scale, "Pulvinaria acericola", occurs on the foliage of "Acer negundo". "Acer negundo" has been used by Native Americans for several medicinal purposes. Recorded food plants include "Malus sylvestris", "Prunus persica", "Prunus serotina", "Acer negundo" and "Vitis" sp.