Influence of Herbicide Safeners on Creeping Bentgrass (Agrostis stolonifera) Tolerance to Herbicides. (September 2015)

• Record Type: Journal Article
• Authors: Elmore, Matthew T.; Brosnan, James T.; Armel, Gregory R.; Vargas, Jose J.; Breeden, Gregory K.
• Is Part Of: Weed technology. Volume 29:Number 3(2015)
• Page Start: 550
• Page End: 560
• Publication Date: 2015-09
• Subjects: Amicarbazone, -- benoxacor, -- bispyribac-sodium, -- cloquintocet-mexyl, -- fenchlorazole-ethyl, -- fenoxaprop-p-ethyl, -- imazapic, -- isoxadifen-ethyl, -- malathion, -- mefenpy-diethyl, -- naphthalic anhydride, -- quinclorac, -- topramezone, -- creeping bentgrass, Agrostis stolonifera L., -- goosegrass, Eleusine indica (L.) Gaertn., -- large crabgrass, Digitaria sanguinalis (L.) Scop.; Cytochrome P450 inhibitor, -- HPPD (p-hydroxyphenylpyruvate dioxygenase), -- P450, -- pyrazolone, -- safener, -- synergist, -- tolerance, -- turfgrass; Weeds -- Periodicals; Weeds -- Control -- Periodicals; 632.5
• DOI: 10.1614/WT-D-14-00045.1
• Languages: English
• ISSNs: 0890-037X

Abstract

Abstract : Glasshouse research was conducted to investigate the efficacy of herbicide safeners for improving creeping bentgrass (CBG) tolerance to various herbicides. CBG injury from amicarbazone (150 g ha −1 ), bispyribac-sodium (110 g ha −1 ), fenoxaprop-p-ethyl (35 g ha −1 ), imazapic (45 g ha −1 ), quinclorac (1, 050 g ha −1 ), or topramezone (37 g ha −1 ) applied in combination with the herbicide safeners naphthalic anhydride or isoxadifen-ethyl was evaluated. These safeners reduced CBG injury from topramezone only. Topramezone was then applied in combination with naphthalic anhydride, isoxadifen-ethyl, cloquintocet-mexyl (cloquintocet), fenchlorazole-ethyl, mefenpyr-diethyl, and benoxacor. These experiments determined that CBG injury was lowest from topramezone in combination with cloquintocet. Additional experiments evaluated topramezone (37 g ha −1 ) with several rates of cloquintocet and determined that applications at ≥ 28 g ha −1 reduced CBG injury similarly. Cloquintocet (28 g ha −1 ) increased topramezone I50 values against CBG, but not large crabgrass or goosegrass. The cytochrome P450 (cP450) inhibitor malathion (1000 g ha −1 ) reduced topramezone I50 values against CBG in one experimental run. Topramezone–cloquintocet combinations warrant further research in field settings.