Finger Lakes growers of Concord and other native grape cultivars should monitor leafhopper populations carefully, as resistance is suspected in isolated vineyards of the region. If carbaryl fails to control leafhoppers, DO NOT repeat application of the material. Application of other materials with different modes of action is recommended. In insecticide trials conducted over the last several years, Provado effectively managed leafhopper populations. M-Pede may cause phytotoxicity under certain environmental conditions.
Damage is mostly cosmetic if vine growth is vigorous.
Some severe problems have been observed on young vines on Long Island. About July 25, and 2 weeks later. Rare except on Long Island, New York, where hot, dry conditions may result in rapidly growing spider mite populations. Registered miticides do not kill eggs. If mite predators are abundant, they may greatly reduce the rate of increase of spider mite populations.