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Spissistilus festinus (Såy, 1830) - (threecornered alfalfa hopper)
This treehopper is a pest of various legumes in North America, feeding on the stems or petioles of crops like alfalfa, soybean or groundnuts. The feeding activities can lead to stem girdling and yield losses on soybeans may reach 50%.
While legumes are the most common hosts, it can also breed on various other plants. For example, it can reproduce on grapevine (Preto et al., 2018) and is a vector of the Grapevine red blotch virus in vineyards (Bahder et al., 2016).
For a review of this pest see Beyer et al. (2017).