Abstract
A strain of <i>Neoaplectana carpocapsae</i> Weiser was discovered in larvae of the grape root borer (GRB) <i>Vitacea politiformis</i> (Harris) in 1974. Subsequent study during 1975-79 of subterranean infections of GRB by <i>N. carpocapsae</i> in 2 Concord,<i>Vitus labrusca</i> L., grape vineyards revealed that mortality was low at both vineyards, being 1.5% for larvae and 0.85% for pupae. Laboratory bioassays demonstrated that high levels (10,000) of dauerlarvae were required to insure high infection levels of newly eclosed, 1-year-and 2-year-old GRB larvae. Several experiments in which inundative populations of <i>N. carpocapsae</i> were adequately applied in various ways in the soil around grape vines failed to infect resident GRB larvae. It was concluded that GRB have evolved a degree of tolerance to <i>N. carpocapsae</i>. The potential of utilizing host origin kairomones to enhance parasitism of the GRB by <i>N. carpocapsae</i> is discussed.
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