Greenhouse Control of the Black Vine Weevil Otiorhynchus sulcatus (Coleoptera: Curculionidae) by Heterorhabditid and Steinernematid Nematodes

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Abstract
We conducted greenhouse tests to determine the effectiveness of the entomogenous nematodes, Heterorhabditis heliothidis, Neoaplectana carpocapsae , and N. glaseri , for control of the black vine weevil, Otiorhynchus sulcatus. H. heliothidis applied to the surface of the soil gave better control against early-instar larvae than did the other nematodes similarly applied. When applied to the soil surface, the three species were equally effective against late-instar larvae but when late-instar larvae were placed 20 cm deep, the best control was achieved with N. glaseri . When injected 5 cm into the soil, the three species showed equal effectiveness against late-instar larvae placed at depths of 5, 10, and 20 cm.