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A two-year field study was conducted in Virginia to determine the combined effects of earlyseason injury caused by certain postemergence-applied herbicides and tobacco thrips, Frankliniella fusca (Hinds), feeding on cv. NC7, virginia-type peanuts. Treatments included combinations of aldicarb, applied as granules in-furrow at planting, and carbaryl, paraquat, acifluorfen, and pyridate applied postemergence. Main stem height, canopy width, tobacco thrips injury, pod weight, and value were measured. Paraquat and acifluorfen treatments significantly reduced main stem height and canopy width compared with pyridate. Thrips injured approximately 40 to 50% of untreated plant leaves. Aldicarb significantly reduced thrips injury to less than 17%. Combined early-season herbicide and thrips significantly reduced peanut main stem height and canopy width compared with plants that were protected from thrips and not subjected to herbicide stress, and differences remained apparent as late as 59 days after treatment, 79 days after planting. Although injured plants achieved normal foliar growth by harvest time, pod weight and value were significantly reduced.
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Keywords: Tobacco thrips, postemergence herbicides, injury, yield
How to Cite:
Herbert, D. & Wilcut, J. & Swann, C., (1991) “Effects of Various Postemergence Herbicide Treatments and Tobacco Thrips (Frankliniella fusca) Injury on Peanut Yields in Virginia¹”, Peanut Science 18(2), p.91-94. doi: https://doi.org/10.3146/i0095-3679-18-2-7