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Suppression of Strawberry Root Weevil, Otiorhynchus Ovatus, in Cranberries By Entomopathogenic Nematodes (Nematoda: Steinernematidae and Heterorhabditidae)

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For more content, see Nematology.

Strawberry root weevil (Otiorhynchus ovatus (L.)) larval populations in Massachusetts (U.S.A.) cranberry bogs showed 32-38% mortality following spray application of the entomopathogenic nematodes, Steinernema carpocapsae (A11 strain) or Heterorhabditis bacteriophora (NC-1-strain). A bioassay of larval and pupal O. ovatus with S. carpocapsae resulted in 62% mortality and with H. bacteriophora in 51 % mortality. A post-harvest application demonstrated the limited distribution of the nematodes from the surface to 40 mm depth after 336 h, which may explain the difference between the results from the field and from the bioassay. A following trial with increased spray pressure reduced the 0. ovatus population from 26.7 to 0.6 live larvae per sample (with S. carpocapsae) and from 16.2 to 1.8 live larvae per sample (with H. bacteriophora, HP88 strain) after 240 h. In this trial, bioassay of 0. ovatus resulted in 74.0% mortality with S. carpocapsae and 68.8% mortality with H. bacteriophora.


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