Herbicide Safeners Increase Creeping Bentgrass (Agrostis stolonifera) Tolerance to Pinoxaden and Affect Weed Control. (December 2016)

• 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 30:Number 4(2016)
• Page Start: 919
• Page End: 928
• Publication Date: 2016-12
• Subjects: Cloquintocet-mexyl, -- fenchlorazole-ethyl, -- mefenpyr-diethyl, -- pinoxaden, -- creeping bentgrass, Agrostis stolonifera L. AGSST, -- perennial ryegrass, Lolium perenne L. LOLPE, -- roughstalk bluegrass, Poa trivialis L. POATR; Acetyl coenzyme A carboxylase, -- ACCase, -- graminicide, -- phenylpyrazoline, -- safener, -- turfgrass; Weeds -- Periodicals; Weeds -- Control -- Periodicals; 632.5
• DOI: 10.1614/WT-D-16-00033.1
• Languages: English
• ISSNs: 0890-037X

Abstract

Abstract : The herbicide pinoxaden is a phenylpyrazoline inhibitor of acetyl coenzyme A carboxylase. Research was conducted to determine the effects of pinoxaden (90 g ai ha −1 ) alone and in combination with herbicide safeners on creeping bentgrass injury as well as perennial ryegrass and roughstalk bluegrass control. Greenhouse experiments determined that herbicide safeners cloquintocet-mexyl, fenchlorazole-ethyl, and mefenpyr-diethyl were more effective in reducing creeping bentgrass injury from pinoxaden than benoxacor, isoxadifen-ethyl, and naphthalic-anhydride. Other experiments determined that creeping bentgrass injury from pinoxaden decreased as rates (0, 23, 45, 68, 90, 225, or 450 g ha −1 ) of cloquintocet-mexyl, fenchlorazole-ethyl, and mefenpyr-diethyl increased. On the basis of creeping bentgrass responses to various safener rates, safeners were applied at 68 and 450 g ha −1 in additional experiments to evaluate their effects on pinoxaden (90 g ha −1 ) injury to creeping bentgrass and efficacy against perennial ryegrass and roughstalk bluegrass. In these experiments, safeners mefenpyr-diethyl and cloquintocet-mexyl reduced pinoxaden-induced creeping bentgrass injury (from 25 to ≤ 5%) more than fenchlorazole-ethyl at 2 wk after treatment. Safeners reduced pinoxaden efficacy against roughstalk bluegrass. Perennial ryegrass was controlled > 80% by pinoxaden and herbicide safeners did not reduce control. Field experiments should evaluate pinoxaden in combination with cloquintocet-mexyl and mefenpyr-diethyl to optimize safener : herbicide ratios and rates for creeping bentgrass safety as well as perennial ryegrass and roughtstalk bluegrass control in different climates and seasons.