A Survey of Weeds and Herbicides in Georgia Pecan. (September 2014)

• Record Type: Journal Article
• Authors: Grey, Timothy L.; Turpin, Fred S.; Wells, Lenny; Webster, Theodore M.
• Is Part Of: Weed technology. Volume 28:Number 3(2014)
• Page Start: 552
• Page End: 559
• Publication Date: 2014-09
• Subjects: 2, 4-D, -- clethodim, -- diruron, -- flumioxazin, -- glyphosate, -- glufosinate, -- halosulfuron, -- indaziflam, -- paraquat, -- sethoxydim, -- simazine, -- bahiagrass, Paspalum notatum Flueggé, -- bermudagrass, Cynodon dactylon (L.) Pers., -- crabgrass species, Digitaria spp., -- curly dock, Rumex crispus L., -- cutleaf evening primrose, Oenothera laciniata Hill, -- Florida pusley, Richardia scabra L., -- Italian ryegrass, Lolium perenne L. ssp. multiforum (Lam.) Husnot, -- morningglory species, Ipomoea spp., -- Palmer amaranth, Amaranthus palmeri S. Wats., -- purslane species, Portulaca spp., -- wild radish, Raphanus raphanistrum L., -- pecan, Carya illinoinensis (Wangenh.) K. Koch.; Postemergence, -- preemergence, -- soil residual herbicides, -- weed management; Weeds -- Periodicals; Weeds -- Control -- Periodicals; 632.5
• DOI: 10.1614/WT-D-13-00126.1
• Languages: English
• ISSNs: 0890-037X

Abstract

Abstract : A survey was conducted in 2012 in Georgia to determine the most troublesome weeds in pecan orchards and document common herbicide weed control practices. Weed control practices and infestations in pecan were divided between winter and summer seasons. The most troublesome pecan winter weed species were wild radish and Italian ryegrass, whereas the most troublesome summer season weeds were Palmer amaranth and bermudagrass. Other weeds included crabgrass species, bahiagrass, Florida pusley, purslane species, morningglory species, curly dock, and cutleaf evening-primrose. The most widely used POST herbicide in both the winter and summer season was glyphosate. The most commonly used year-round herbicides with soil persistence were pendimethalin, diuron, flumioxazin, halosulfuron, simazine, indaziflam, and oryzalin. Use of multiple herbicides, PRE- and POST-contact and soil-persistent, with various herbicide mechanisms of action, have benefited pecan producers by providing year-round weed control, despite herbicide-resistant weeds being widely established in this region.