Enhancement of fluazifop-P toxicity to torpedograss (Panicum repens L.) by surfactant and oil-additive
1991
Chandrasena, J.P.N.R. (University of Colombo (Sri Lanka))
The influence of the surfactant "Argal 90" and soil additive "Atplus 411F" and their concentration on the efficacy of the R enantiomer of Fluazifop [2-[4-[5-(trifluoromethyl)-2-pyridiny] oxyphenoxy] propionic acid] for controlling rhizomatous torpedograss (Panicum repens L.) was investigated in greenhouse studies. Agral 90 at 0.25 percent v/v and Atplus at 1.0 percent v/v significantly improved the regrowth suppression and rhizome, bud-kill of torpedograss achieved by Fluazifop-P at the rates of 0.125, 0.25, 0.5, 1.0 and 2.0 kg a.i/ha. Increasing the surfactant concentration in spray solution up to 1.0 percent, v/v, or oil additive concentration up to 2.0 percent v/v improved the efficacy of the herbicide further. When torpedograss foliage was washed either 0, 1, 6, 24, 48, or 96 h after treatment, the degree of control achieved was generally not affected by the type of adjuvant, surfactant or soil additive used. With Fluazifop- P applied alone, at least 96 h was needed to insure adequate basipetal translocation to obtain maximum kill of rhizome buds and regrowth suppression. The surfactant or oil additive shortened this interval to 48 h (0.25 percent of surfactant or 1.0 percent of oil, v/v), and to 24 h (1.0 percent of surfactant or 2.0 percent of oil, v/v). This study confirms the possibility of using Fluazifop-P effectively against torpedograss and indicates how the additives could be used to improved further activity.
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