Abstract
Abstract Grape root borer, Vitacea polistiformis (Harris), is an economically important and potentially destructive pest of grape vines in portions of the eastern United States. Its oligophagous larvae feed on the roots of cultivated and wild Vitis species. In commercial vineyards, adult females oviposit on aboveground parts of vines and other vegetation in vine rows. The loosely attached eggs are thought to drop to the ground and, upon eclosion, neonates quickly burrow into the soil to search for grape roots. Although vineyard infestation by grape root borer is ultimately dependent upon larval success at finding and establishing on vine roots, little is known about larval movement capabilities in the soil. In this study, soil column bioassays were used to evaluate neonate movement in the horizontal and vertical dimensions, the influence of grape root stimuli on the rate and frequency of food-finding, and the distance over which the neonates responded to these stimuli. Grape root borer neonates moved bot...
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