Abstract
Life tables were constructed for single, 2-yr generations of Vitacea polistiformis (Harris) in 2 north central Georgia ‘Concord’ grape vineyards with contrasting cultural systems. At a site with scheduled insecticide treatments, annual intertrellis tillage and a 4-arm Kniffin training system, the percent egg mortality from predation was 11.6 and egg hatchability of eggs not killed by predators was 25.3. At a site with no insecticide treatment, no annual tillage, and a Modified Munson training system, egg mortality by predation was 61.7% and hatchability was 76.8%. No significant differences were found between the 2 sites for survival of the subterranean life stages. Lowest survival occurred in the larval period from eclosion from the egg to the establishment of the 1st feeding site; high survival occurred in the larval period spent in the feeding site and during the pupal stage.
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