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Dispersion and movement of the Lygus spp. parasitoid Peristenus relictus (Hymenoptera: Brachonidae) in trapcropped organic strawberries

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Alfalfa trap crops can be used to manage Lygus spp. in organic strawberries on the California Central Coast. The retention of Lygus spp. in alfalfa creates aggregated distributions that provide improved opportunities for biological control by the introduced parasitoid Peristenus relictus (Ruthe). The abundance and distribution of P. relictus between two trap crops separated by 50 strawberry rows was analyzed in 2008 and 2010. Parasitism of Lygus spp. nymphs by P. relictus (measured by larval abundance and % parasitism) was greatest in alfalfa trap crops when compared with strawberry rows. The spatial distribution of nymphs and P. relictus larvae in and between trap crops was significantly correlated and bimodal. The movement of P. relictus adults from a marked alfalfa trap crop into adjacent strawberry rows or trap crops was also studied in 2008 and 2009 using a chicken egg albumin enzyme-linked immunosorbent assay (ELISA) mark-capture technique. In 2008 and 2009, 85% and 49% of protein-marked wasps were captured from central trap crops, indicating that alfalfa trap crops act as host-density-anchors in organic strawberries that allow for spatial density dependence between parasitoid and host.
James Hagler , Sean L. Swezey , Diego J. Nieto , Charles H. Pickett , Janet A. Bryer , Scott A. Machtley
Lygus , Peristenus , alfalfa , biological control , chickens , egg albumen , enzyme-linked immunosorbent assay , host plants , imagos , insect control , larvae , nymphs , organic foods , organic production , parasitism , parasitoids , spatial distribution , strawberries , trap crops
USDA Scientist Submission
Environmental entomology 2014 4 9 v.42 no.(2)
Journal Articles, USDA Authors, Peer-Reviewed
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