The objective of these studies was to evaluate rates and mixtures of imazethapyr and imazapyr with isopropylamine (1:1) plus imazethapyr combination for growth suppression, seedhead control, and turf discoloration of tall fescue (festuca arundinacea Schreb.) Intended for highway roadside turf. Imazethapyr applied alone at rates of 25to 123 g/ha provided effective suppression of height for 4 to 9 weeks, controlled seedheads, and generally failed to discolour turf to unacceptable levels. More discoloration was evident in turf treated with imazethapyr plus imazapyr combinations in comparison with turf treated with imazethapyr alone. Rates of 94 + 5.0 to 123 +4.4 g/ha imazethapyr plus imazapyr, respectively, provided good growth and seedhead suppression, and although discoloration occurred, turf generally recovered following termination of suppression.
Samenvatting