Effects of Repeated Applications of Bensulide and Tricalcium Arsenate on the Control of Annual Bluegrass and on Quality of Highland Colonial Bentgrass Putting Green Turf1
- R. L. Goss,
- T. W. Cook,
- S. E. Brauen and
- S. P. Orton
The effects of bensulide and tricalcium arsenate in combination with fungicides on encroachment of annual bluegrass (Poa annua L.) and on color, density, thatch, and root depth of a ‘Highland’ colonial bentgrass (Agrostis tenuis Sibth.) putting green turf were measured. Herbicides tested during the 5-year period were: granular tricalcium arsenate applied the 1st year at 781.2 kg/ha with additional spring and fall applications of 98 kg/ha each in subsequent years; bensulide (EC) (O, O-diisopropyl phosphorodithioate S-ester with N-(2-mercaptoethyl)-benzenesulfonamide) applied at 16.8 kg/ha annually or 13.5 kg/ha applied in September plus 3.4 kg/ha every 3 months for an annual total of 23.7 kg/ha. Fungicides applied were mancozeb (zinc ion and manganese ethylene bisdithiocarbamate) at 25.8 kg, PMA (phenyl mercuric acetate) 1.08 liters/ha of 10 % formula, and benomyl (methyl 1-(butylcarbamoyl)-2-benzimidazolecarbamate) at 6.5 kg/ha alone to control Fusarium [incited by Fusarium nivale (Fr.) S & H]. Significant reductions in annual bluegrass populations were recorded from applications of tricalcium arsenate and repeated applications of bensulide, but not from a single annual application of bensulide nor from the fungicides. Only tricalcium arsenate significantly reduced color and density as compared to the untreated control in some years, but differences were minor and the turf was considered of acceptable quality. Thatch development was reduced in plots treated with bensulide alone as compared to all other treatments. None of the treatments significantly reduced rooting depth.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 1980. . Copyright © 1980 by the American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, and International Turfgrass Society, 5585 Guilford Rd., Madison, WI 53711 USA