Heterorhabditis bacteriophora 'Oswego' is a strain collected from Northern New York. This strain of the nematode will infect Japanese beetle, Popillia japonica, European chafer, Rhizotrogus majalis, and mature alfalfa snout beetle larvae, Otiorhynchus ligustici. It moves well through the soil and is very effective in locating and infecting alfalfa snout beetle larvae feeding on alfalfa roots.
A single introduction of this nematode was made to field plots in New York in June 1991. H. b. 'Oswego' showed a high level of field efficacy against alfalfa snout beetle during the year of application and high levels of persistance the following spring and summer. Although nematode populations eventually declined to 10% of the level present in the soil shortly after application, this was probably a result of the declining host insect presence in the plots over time. Field research is currently underway to test the efficacy of this nematode on a multi-year basis from a single field introduction.
Large quanties of this nematode strain may be purchased from Biologic, P.O. Box 177, Willow Hill, PA 17271; phone (717) 349-2789. Small quantities of this nematode may be obtained from the author free of charge. This nematode is public domain and is not protected by patent.
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