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| Publication Type:
| Report |
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| Author(s): | McCarty, L. B. |
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| Author Affiliation: | Department of Ornamental Horticulture, University of Florida, Gainesville, FL |
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| Title: | Goosegrass control and turfgrass tolerance to diclofop-methyl |
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| Translated Section: | Weed control in turf, pasture, and rangeland |
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| Meeting Info.: | Nashville, Tennessee: January 16-18, 1989 |
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| Source: | Proceedings: Southern Weed Science Society. Vol. 42, 1989, p. 144. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Diclofop-methyl (trade name Hoelon) is a relatively new herbicide used primarily in small grain production for control of annual grasses such as annual ryegrass (Lolium multiflorum) and wild oat (Avena fatua). Studies were conducted in Florida to examine postemergence control of goosegrass (Elusine indica) and turfgrass tolerance to various diclofop rates and combinations with MSMA and metribuzin. Diclofop (0.28 to 1.12 kg ai/ha) was applied to bentgrass (Agrostis tenuis) in spring. St Augustinegrass (Stenotaphrum secudatum), centipedegrass (Eremochloa ophiuroides), and bermudagrass (Cynodon dactylon 'Tifway' and 'Tifgreen') were treated (1.12 to 4.48 kg ai/ha) in summer. Visual Turfgrass phytotoxicity and goosegrass control ratings were recorded at various intervals after herbicide application. Excellent goosegrass control was achieved three weeks after treatment (WAT) with diclofop alone (>2.24 kg ai/ha) and in combination with metribuzin (0.28 kg ai/ha). By 7 WAT, all diclofop rates provided excellent control. Diclofop is a slow acting material requiring several weeks before adequate weed control is achieved. When averaged over all rates, the addition of Triton AG-98 (0.25% v/v) increased control 85% versus 79% when not used at 3 WAT. The combination of diclofop (all rates), AG-98, and MSMA (2.24 kg ai/ha) resulted in decreased goosegrass control. At 3 WAT, diclofop + AG-98 provided good control (89%), while the three-way combination provided only fair control (76%). A second experiment revealed a similar trend where diclofop (all rates) + AG-98 provided good control (85%), while the three-way combination provided only fair control (68%). Bermudagrass turf tolerance to diclofop was good to excellent. Diclofop at all rates with and without AG-98 provided acceptable Tifgreen and Tifway bermudagrass color through 7 WAT. The addition of MSMA (2.24 kg ai/ha) plus diclofop (>2.24 kg ai/ha) reduced Tifgreen (mowed at 0.64 cm) turf color below aesthetically acceptable levels through 1 WAT. Turf fully recovered after this date. In general, the addition of metribuzin (0.28 kg ai/ha) reduced turf color, but only temporarily (1 WAT). Diclofop applied in April (0.28 to 1.12 kg ai/ha) to bentgrass resulted in acceptable turf color through 7 WAT. Centipedegrass was also tolerant to diclofop (1.12 to 4.48 kg ai/ha). Unacceptable injury and stand density reduction resulted when St. Augustine turf eventually recovered, but time required for this would be unacceptable for most turf managers." |
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| Language: | English |
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| References: | 0 |
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| Note: | "Finding a common ground"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McCarty, L. B. 1989. Goosegrass control and turfgrass tolerance to diclofop-methyl. South. Weed Sci. Soc. Proc. 42:p. 144. |
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