title: Mobility and dissipation of ethofumesate and halofenozide in turfgrass and bare soil.
abstract: The effect of turfgrass cover on the leaching and dissipation of ethofumesate and halofenozide was studied. Sampling cylinders (20 cm diam. x 30 cm long) were placed vertically in plots of creeping bentgrass (Agrostis palustris Huds.), tall fescue (Festuca arundinaceae Schreb.), or bare soil. ethofumesate [(+/-)-2-ethoxy-2,3-dihydro-3,3-dimethylbenzofuran-5-yl methansulfonate] was applied at 840 g ai ha(-)(1) on September 21, 1997. Halofenozide (N-4-chlorobenzoyl-N'-benzoyl-N'-tert-butylhydrazine) was applied at 1680 g ai ha(-)(1) on August 30, 1998. Replicate sampling cylinders were removed 2 h after treatment and 4, 8, 16, 32, and 64 days after treatment. Sampling cylinders were sectioned by depths and soil extracts were assayed by HPLC with a pesticide detection limit of 0.01 mg kg(-)(1). Turfgrass was divided into verdure and thatch and analyzed separately. ethofumesate leaching in turfgrass was reduced by at least 95% compared to leaching in bare soil. The half-life of ethofumesate in bare soil was 51 days compared to 3 days in turfgrass. Halofenozide showed similar leaching with or without turfgrass. Fifty percent dissipation of halofenozide did not occur within 64 days, regardless of organic matter cover.
authors: Department of Horticultural and Crop Science, 2021 Coffey Road, The Ohio State University, Columbus, OH 43210-1086, USA.
authors: D S
authors: DS
authors: Gardner
authors: B E
authors: BE
authors: Branham
mesh_terms: D001565:Benzoates / Q000032:analysis / Q000378:metabolism*; D001572:Benzofurans / Q000032:analysis / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid; D004787:Environmental Pollution / Q000032:analysis; D006207:Half-Life; D006540:Herbicides / Q000032:analysis / Q000378:metabolism*; D006834:Hydrazines / Q000032:analysis / Q000378:metabolism*; D007306:Insecticides / Q000032:analysis / Q000378:metabolism*; D008698:Mesylates / Q000032:analysis / Q000378:metabolism*; D010573:Pesticide Residues / Q000032:analysis / Q000378:metabolism*; D006109:Poaceae; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism; D013997:Time Factors
chemical_list: D001565:Benzoates; D001572:Benzofurans; D006540:Herbicides; D006834:Hydrazines; D007306:Insecticides; D008698:Mesylates; D010573:Pesticide Residues; D012987:Soil; D012989:Soil Pollutants; C412911:ethofumesate; C437546:N-4-chlorobenzoyl-N'-benzoyl-N'-tert-butylhydrazine