Full TGIF Record # 16315
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Web URL(s):http://www.wsweedscience.org//wp-content/uploads/proceedings-archive/1989.pdf#page=233
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Publication Type:
Author(s):Wiley, D. C.; Pearson, J. O.
Author Affiliation:BASF Corp., Woodland and Roseville, CA
Title:Quinclorac for Postemergence Control of Crabgrass in Turf
Meeting Info.:Held March 13-16, 1989, Honolulu, HI.
Source:Proceedings of the Western Society of Weed Science. Vol. 42, March 1989, p. 221.
Publishing Information:Logan, UT: Plant Science Dept., Utah State University.
Keywords:TIC Keywords: Postemergence herbicides; Weed control; Digitaria ischaemum; Toxicity; Auxins; Poa pratensis; Lolium multiflorum; Lolium perenne; Festuca arundinacea; Cynodon; Zoysia; Resistance; Festuca rubra subsp. rubra; Agrostis; Eremochloa ophiuroides; Stenotaphrum secundatum; Poa annua; Cynodon dactylon; Irrigation; Application rates; Surfactants; Infestations; Phytotoxicity
Abstract/Contents:"The chemical name of quinclorac is: 3, 7-dichloro-8-quino-linecarboxylic acid. It's dermal LD/50 is 2000 mg/kg for rats, and LC/50 is 100 mg/L for fish. The technical active ingredient has demonstrated low toxicity to laboratory animals, birds, fish, aquatic invertebrates and pollinating insects. Quinclorac is taken into the plant both through the root and the shoot. Mode of action in broadleaf species is the interaction with the auxin regulation. Grass species is unknown. Tolerant turf grasses found so far are Kentucky bluegrass, annual rye, perennial rye, tall fescue, bermudagrass, zoysia, and centipede grass (pre.). Non-tolerant turf grasses include red fescue, bentgrass, bahia, St. Augustinegrass and centipedegrass (post). In 1988, in California, BASF established two postemergence trials on established turf grass. Turf grasses present were Kentucky bluegrass (Poa pratensis), perennial ryegrass (Lolium perenne L.), annual bluegrass (Poa annua), and common bermuda grass (Cynodon dactylon). These tests were well watered and had heavy infestations of smooth crabgrass (Digitaria ischaemum). Once crabgrass emerges, it is a very difficult weed to control. Rates ranging from 0.5 to 2.0 lb ai/acre of quinclorac were applied in a randomized block design. Sequential applications were applied in a few treatments at each test site. Applications were made on 8/15/88 and 9/14/88. Quinclorac has been tested under the code number BAS 514 OOH and BAS 514 16 H. This herbicide was applied using a CO2 pressurized backpack sprayer with 8004 flat fan nozzles, 40 psi, and at 1002 gpa of water. A surfactant, BAS 09002S, was used at 0.25% v/v. Results showed excellent control with all rates tested. Control was maintained for about 30 days with the lower rates tested; then some regrowth occurred. The 1.5 and 2.0 lb ai/acre rates held for longer periods of time. Levels of infestation were reduced drastically after one application with all rates tested. Sequential applications were also showing excellent control when the trials were terminated. Slight yellowing of annual bluegrass and perennial ryegrass was observed at the 2.0 lb ai/acre rate. After 21 days the yellowing had disappeared. No other phytotoxicity symptoms were noted in these tests. Further testing for 1989 could include irrigation frequency and amounts, additional rate and timing trials, and continuing turf grass tolerance studies."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Wiley, D. C., and J. O. Pearson. 1989. Quinclorac for Postemergence Control of Crabgrass in Turf. Proc. West. Soc. Weed Sci. 42:p. 221.
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