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Grape Leafhoppers feed on grape vines and suck large amounts of sap out of leaves and new twig growth. As they suck the sap, they produce large amount of honeydew, which is a discharge of undigested sap sugars. The honeydew appears as a clear, shiny, sticky material on the leaves. As the Grape Leafhopper feeds on the leaves, it places significant stress on the vine, reducing the plant’s ability to produce fruit.
Leafhoppers should be controlled as early as possible, before serious damage occurs. Spray the tree with Bug Buster Pyrethrin Insect Spray and repeat every seven to fourteen days, as necessary.