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  • Author or Editor: P. H. Dernoeden x
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Field studies were conducted in Kansas and Maryland to compare the safety and efficacy of halosulfuron-methyl (HM) and bentazon for topkill of yellow nutsedge (Cyperus esculentus L.). Kentucky bluegrass (Poa pratensis L.) and creeping bentgrass (Agrostis palustris Huds.) treated with single (in Kansas) or sequential (in Maryland) HM (35 to 140 g·ha–1) or bentazon (1120 or 1680 g·ha–1) applications exhibited little injury, and treated turf had acceptable quality in all studies. Bentazon caused an unacceptable reduction in perennial ryegrass (Lolium perenne L.) quality at ≥5 weeks after treatment in four of five tests. Perennial ryegrass quality declined linearly with increasing HM rates (between 35 and 140 g·ha–1). In Maryland, HM (≥70 g·ha–1) elicited unacceptable perennial ryegrass quality for 2 or 3 weeks; however, in Kansas, quality was unacceptable for ≈1 week. In Kansas, yellow nutsedge topkill by HM (70 kg·ha–1) ranged from 52% to 97%. A single HM application (35, 70, or 140 kg·ha–1) provided > 97% topkill in Maryland. Yellow nutsedge topkill by bentazon (1680 g·ha–1) generally was inferior to that by HM (70 g·ha–1). Chemical names used: 3-(1-methylethyl)-1H-2,1,3-benzothiadiazin-4 (3H)-one 2,2-dioxide (bentazon), methyl 3-chloro-5-(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl)-1-methylpyrazole-4-carboxylate (halosulfuron-methyl).

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The adhesives gum arabic, Methocel A-15, Pelgel, Solka Floe, and 2 experimental materials were evaluated for their effect on germination and early seedling growth of ‘Kentucky 31’ tall fescue (Festuca arundinacea Schreb.), and ‘Adelphi’ Kentucky bluegrass (Poa pratensis L.) and for their ability to retain a limestone seed coating. The adhesives did not adversely affect seed germination, turf quality, and early growth of seedlings of either species. Seedling growth of ‘Adelphi’, however, was enhanced by Methocel A-15 when compared to the control. Adhesive effectiveness for the retention of a limestone seed coating was in the order: Methocel A-15 > Pelgel > Solka Floe > AP-1 = AP-2.

Open Access