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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=169
Last checked: 07/15/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Murphy, T. R. |
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| Author Affiliation: | The University of Georgia, Griffin, GA |
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| Title: | Response of johnsongrass, southern crabgrass and forage bermudagrass to imazapic |
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| Section: | Weed management in turf, pasture, and rangeland
Other records with the "Weed management in turf, pasture, and rangeland" Section
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| Meeting Info.: | Houston, Texas: January 27-29, 2003 |
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| Source: | Proceedings: Southern Weed Science Society: 56th Annual Meeting. Vol. 56, 2003, p. 83. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Biomass; Cynodon; Digitaria ciliaris; Forage crops; Hay; Herbicide evaluation; Imazapic; Sorghum halepense
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| Abstract/Contents: | "Johnsongrass [Sorghum halepense (L.) Pers.] and southern crabgrass [Digitaria ciliaris (Retz.) Koel.] are problem weeds in forage bermudagrass (Cynodon spp.) hay fields. Imazapic (Plateau) was labeled in 2002 for the control of these weeds in forage bermudagrass; however, additional research was needed to determine the impact of bermudagrass hay harvest on the efficacy of imazapic for the control of johnsongrass and southern crabgrass. Experiments were conducted at the Central Georgia Research and Education Center near Eatonton, Georgia to determine: a) the effect of hay harvest interval after imazapic application on johnsongrass control, and b) the effect of imazapic application interval after hay harvest on southern crabgrass control. Two separate experiments were conducted. In each experiment, a factorial treatment arrangement in a randomized complete block design with three replications was utilized. In the johnsongrass experiment, imazapic at 4.0, 6.0 and 8.0 fl. ozs. product/acre + 0.25% v/v nonionic surfactant was applied in mid-June to johnsongrass 30 in. tall in the boot to seedhead growth stage. Hay was harvested at either 7, 14 and 21 days after treatment (DAT) and again at 30 and 60 days after the initial hay harvest (DAIH). In the southern crabgrass experiment, imazapic at 4.0, 6.0 and 8.0 fl. ozs. product/acre + 0.25% v/v nonionic surfactant was applied either 7,14 or 21 DAIH. Weed control and bermudagrass injury was recorded at various DAT, and aboveground biomass was harvested at selected DAIH. Bermudagrass and johnsongrass or southern crabgrass plants were dried, physically separated and weighed to determine the effect of imazapic on bermudagrass hay yield and weed aboveground biomass. Johnsongrass. There was no imazapic rate by hay harvest interval interaction on bermudagrass injury and hay yield or on johnsongrass control and biomass production. Imazapic rate effects on johnsongrass control and biomass reduction were significant. At 68 DAT, 6.0 and 8.0 fl. ozs./acre provided better johnsongrass control than 4.0 fl. ozs./acre. All rates of imazapic reduced johnsongrass biomass at 30 DAT, but only 8.0 fl. ozs./acre reduced biomass at 60 DAT. Total (sum of three hay harvests ) bermudagrass hay yields with all rates of imazapic were higher than the untreated check. Southern crabgrass. There was no imazapic rate by application timing after hay harvest interactions on bermudagrass injury and hay yield or on southern crabgrass control and biomass production. Only the main effects of imazapic rate and application timing significantly impacted bermudagrass injury and hay yields. At 12 and 21 DAT, imazapic applied 21 DAIH injured bermudagrass less than when applied at 7 and 14 DAIH. Across the rates used in this study, imazapic reduced total bermudagrass hay yield (sum of two hay harvests) 26 to 34%. Imazapic at rates of 4.0, 6.0 and 8.0 fl. ozs./acre were equally effective in reducing southern crabgrass biomass. Timing of imazapic application after bermudagrass hay harvest did not affect the level of southern crabgrass control or biomass reduction." |
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| Language: | English |
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| References: | 0 |
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| Note: | "Invasive weeds: Real or imagined threat?"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Murphy, T. R. 2003. Response of johnsongrass, southern crabgrass and forage bermudagrass to imazapic. South. Weed Sci. Soc. Proc. 56:p. 83. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2003%20Proceedings-SWSS.pdf#page=169
Last checked: 07/15/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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