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This article in AJ

  1. Vol. 85 No. 3, p. 560-563
     
    Received: Feb 8, 1992


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doi:10.2134/agronj1993.00021962008500030008x

Creeping Bentgrass Rooting as Influenced by Dithiopyr

  1. P. H. Dernoeden ,
  2. N. E. Christians,
  3. J. M. Krouse and
  4. R. G. Roe
  1. D ept of Agronomy, Univ of Maryland, College Park, MD 20742
    D ep of Horticulture, Iowa State Univ., Ames, IA 5001

Abstract

Abstract

Dithiopyr [3,5-pyridinedicarbothioic acid, 2-(difluoromethyl)-4(2-methylpropyl)-6-trifluoromethyl)S,S-dimethyl ester] is a new herbicide, but its foliar safety and potential rooting effects need to be documented before its use on creeping bentgrass (Agrostis palustris Huds.) can be recommended. Field studies were conducted at five separate sites in Iowa and in Maryland, where creeping bentgrass was grown on modified sandy soils and maintained at putting green height. Three dithiopyr formulations (1.0 emulsifiable concentrate, 0.10 granular, 0.25 granular) at rates ranging from 0.28 to 0.84 kg ha−1 were compared with label rates of either bensulide [O,O-bis (1-methylethyl) S-(2-[(phenylsulfonyl)amino| ethyl] phosphorodithioate] or bensulide + oxadiazon [3-[2-4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethyl)-1,3,4-oxadiazol-2-(3H)-one] or DCPA [dimethyl 2,3,5,6-tetrachloro-1, 4-benzenedicarboxylate] for potential rooting and foliar discoloration effects. Root masses were obtained from washed soil plugs, which were combusted to determine root weight. In Iowa all herbicides reduced total root weight on one of four sampling dates in 2 yr. No rooting differences were observed among herbicide rates or formulations at soil depths partitioned at 0 to 5, 5 to 10, 10 to 15, or 15 to 20 cm. Reduced root weight was observed with all herbicides on at least one of nine sampling dates in Maryland. Root weight reduction in Maryland studies was observed primarily within 29 d of treatment (DAT) in 1990, but not within 57 DAT in 1990 or on six sampling dates in 1991. No foliar discoloration was elicited by dithiopyr applied in either April or May. Discoloration and cover reduction occurred where dithiopyr 1.0 EC (0.84 kg ha−1) and bensulide + oxadiazon (6.7 + 1.7 kg ha−1) were applied in mid-June in Maryland. Overall, data indicate that dithiopyr (0.28-0.84 kg ha−1) had an acceptable safety margin for creeping bentgrass foliage and rooting on putting greens when applied preemergence in spring.

Scientific Article no. A 6302 and Contribution no. 8473 of the Maryland Agric. Expt. Sta. College Park, MD 20742; Journal Paper no. 14775 and Project no. 2231 of the Iowa Agric. and Home Econ. Expt. Sta., Ames, IA 50011.

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