scholarly journals Tank-Mixed Postemergence Herbicides for Postemergence Goosegrass Control in Bermudagrass Turf

1997 ◽  
Vol 15 (1) ◽  
pp. 33-36
Author(s):  
B. Jack Johnson
Keyword(s):  
United States ◽  
High Temperature ◽  
Field Experiment ◽  
Air Temperature ◽  
Cynodon Dactylon ◽  
Southern United States ◽  
Eleusine Indica ◽  
Common Bermudagrass ◽  
Postemergence Herbicides

Abstract Goosegrass [Eleusine indica (L.) Gaertn.] continues to be a major weed problem in bermudagrass (Cynodon spp.)throughout the southern United States. A field experiment was conducted during 1995 and 1996 in Georgia to determine if tank-mixed postemergence herbicides would improve goosegrass control in common bermudagrass [Cynodon dactylon (L.) Pers.] turf. Illoxan (diclofop), MSMA plus Sencor (metribuzin), MSMA plus Sencor with Princep (simazine), and selected rates of Illoxan with Princep controlled goosegrass effectively (≥83%) for 8 weeks in 1995. However, the control was ineffective (<80%) for any treatment by 8 weeks in 1996. The higher control in 1995 was probably related to higher air temperature [mean high temperature was 35C (95F) for 14 days after treatment] compared to 1996 [32C (89F) during the same period]. Tank-mixes of Princep with MSMA did not improve goosegrass control compared with Illoxan alone. Addition of Princep to MSMA, MSMA plus Sencor, or Illoxan did not increase bermudagrass injury compared to these treatments applied without Princep.

Tank-Mixed Postemergence Herbicides for Large Crabgrass (Digitaria sanguinalis) and Goosegrass (Eleusine indica) Control in Bermudagrass (Cynodon dactylon) Turf

1996 ◽  
Vol 10 (4) ◽  
pp. 716-721 ◽  
Author(s):  
B. Jack Johnson
Keyword(s):  
Cynodon Dactylon ◽  
Single Application ◽  
Digitaria Sanguinalis ◽  
Eleusine Indica ◽  
Common Bermudagrass ◽  
Postemergence Herbicides ◽  
Large Crabgrass

A two-year experiment was conducted to determine if tank-mixes of postemergence (POST) herbicides would consistently control large crabgrass and goosegrass in common bermudagrass turf compared to herbicide alone treatments. Tank-mixes of MSMA plus quinclorac at 2.2 + 0.6 kg/ha effectively controlled large crabgrass (≥ 81%) for 10 to 11 weeks during 1993 and 1994. The control from MSMA plus dithiopyr at 2.2 + 0.3 kg/ha was higher during this period than when each herbicide was applied alone at the same rate. There was no increase in large crabgrass control from tank-mixes of MSMA and diclofop applied in a single application, when compared with two applications of MSMA applied at 2.2 kg/ha. Goosegrass control at 9 wk after tank-mixed treatments of MSMA (2.2 kg/ha) and diclofop (≥ 0.3 kg/ha) in 1994 was lower (12 to 28%) than when diclofop at 1.1 kg/ha was applied alone (85%). Tank-mixes of MSMA with quinclorac or dithiopyr did not control goosegrass. In general, common bermudagrass injury was no higher from herbicide combinations than when each was applied alone. An exception occurred at 1 wk after treatment in 1993 when common bermudagrass injury was higher from tank-mixes of MSMA plus diclofop at 2.2 + 1.1 kg/ha, than when either herbicide was applied alone.

scholarly journals Sequential and Tank-Mixed Dimension (Dithiopyr) and MSMA Treatments for Large Crabgrass Control in Bermudagrass Turf

1997 ◽  
Vol 15 (1) ◽  
pp. 30-33
Author(s):  
B. Jack Johnson
Keyword(s):  
Field Experiment ◽  
Air Temperature ◽  
Cynodon Dactylon ◽  
Digitaria Sanguinalis ◽  
Common Bermudagrass ◽  
Mixed Dimension ◽  
Large Crabgrass

Abstract A field experiment was conducted during 1995 and 1996 in Georgia to determine the influence of Dimension (dithiopyr) and MSMA applied as sequential and tank-mixed treatments on large crabgrass [Digitaria sanguinalis (L.) Scop.] control in common bermudagrass [Cynodon dactylon (L.) Pers.]. Large crabgrass control by late August was equal to or higher when Dimension and MSMA were applied in a single tank-mixed application after weeds emerged in early May than when Dimension was applied as preemergence late February followed by MSMA as postemergence early June. Full season control ranged from ≥73% for tank-mixes of Dimension plus MSMA at 0.14 + 1.1 kg/ha (0.12 + 1.0 lb/A) to ≥93% when applied at 0.28 + 2.2 kg/ha (0.25 + 2.0 lb/A). The injury to common bermudagrass was due to MSMA and not related to Dimension. MSMA applied in May caused only slight discoloration but injury in June ranged from from ≤42% in 1995 and ≤25% in 1996. The higher injury in 1995 was related to higher air temperature following treatments. When injury was observed, recovery occurred within 2 to 3 weeks.

Reduced Rates of Preemergence and Postemergence Herbicides for Large Crabgrass (Digitaria sanguinalis) and Goosegrass (Eleusine indica) Control in Bermudagrass (Cynodon dactylon)

Weed Science ◽  
1996 ◽  
Vol 44 (3) ◽  
pp. 585-590 ◽  
Author(s):  
B. Jack Johnson
Keyword(s):  
Cynodon Dactylon ◽  
Digitaria Sanguinalis ◽  
Eleusine Indica ◽  
Previously Treated ◽  
Common Bermudagrass ◽  
Postemergence Herbicides ◽  
Large Crabgrass

Sequential applications of preemergence (PRE) and postemergence (POST) herbicides were applied over a two-year period for large crabgrass and goosegrass control in common bermudagrass. Large crabgrass control was better when prodiamine at 0.3 kg ai ha−1or oryzalin at 0.8 kg ai ha−1were applied in late February, and followed by MSMA at 1.1 kg ai ha−1in June than when prodiamine (0.8 kg ha−1) or oryzalin (2.4 kg ha−1) were applied at recommended rates. Goosegrass control was better when prodiamine was applied at 0.3 kg ha−1followed by MSMA plus metribuzin at 2.2 + 0.1 kg ai ha−1, or when oryzalin was applied at 1.7 kg ha−1followed by MSMA plus metribuzin at 1.1 + 0.1 kg ha−1than when prodiamine was applied at 0.8 kg ha−1or oryzalin was applied at 3.3 kg ha−1. There was no increase in goosegrass control when diclofop was applied in sequence after prodiamine or oryzalin compared to diclofop alone. POST applications of diclofop, MSMA, and MSMA plus metribuzin did not injure common bermudagrass more severely when applied to plots previously treated with prodiamine and oryzalin than with POST herbicides alone.

Sequential Herbicide Treatments for Large Crabgrass (Digitaria sanguinalis) and Goosegrass (Eleusine indica) Control in Bermudagrass (Cynodon dactylon) Turf

1993 ◽  
Vol 7 (3) ◽  
pp. 674-680 ◽  
Author(s):  
B. Jack Johnson
Keyword(s):  
Cynodon Dactylon ◽  
Digitaria Sanguinalis ◽  
Eleusine Indica ◽  
Herbicide Treatments ◽  
Previously Treated ◽  
Common Bermudagrass ◽  
Large Crabgrass

Preemergence (PRE) and postemergence (POST) herbicides were sequentially applied to common bermudagrass over a two-year period to determine the lowest herbicide rates required to maintain acceptable large crabgrass and goosegrass control. Large crabgrass control was consistently higher in late August when MSMA at 2.2 kg ha−1was applied to plots previously treated with dithiopyr at 0.3 kg ha−1(99%) in 1991, and either pendimethalin at 1.1 kg ha−1(95%) or oxadiazon at 1.1 kg ha−1(94%) in 1992 than when either herbicide was applied alone (≤ 79%). Goosegrass control was also higher in late August when MSMA plus metribuzin at 2.0 + 0.14 kg ha−1was applied to plots treated with pendimethalin at 1.7 kg ha−1(71%) in 1991, with oxadiazon at ≤ 2.2 kg ha−1(≤ 89%) in 1992, and with dithiopyr at 0.4 kg ha−1(≤ 96%) both years than when the herbicides were applied alone. Diclofop at 1.1 kg ha−1applied alone as POST controlled ≥ 96% goosegrass throughout the two-year period.

scholarly journals Nitrogen and Sprigging Rate Effects on ‘Latitude 36’ Hybrid Bermudagrass Establishment

2017 ◽  
Vol 27 (3) ◽  
pp. 382-385 ◽  
Author(s):  
Gregg C. Munshaw ◽  
Jeffery S. Beasley ◽  
Christian M. Baldwin ◽  
Justin Q. Moss ◽  
Kenneth L. Cropper ◽  
...  
Keyword(s):  
United States ◽  
Cynodon Dactylon ◽  
The United States ◽  
Southern United States ◽  
Percent Cover ◽  
Climatic Zones ◽  
Surface Cover ◽  
Rate Effects ◽  
Speed Up ◽  
N Rates

Hybrid bermudagrass [Cynodon dactylon × Cynodon transvaalensis] is frequently used throughout the southern and transitional climatic zones of the United States. These grasses can only be vegetatively propagated, such as by sprigging. Turf managers will often apply high rates of sprigs and nitrogen (N) in an attempt to minimize the time to establishment. However, little is known about how planting and N rates affect establishment. The objective of this study was to determine optimum sprigging and N rates during the establishment of ‘Latitude 36’ hybrid bermudagrass to minimize time to full surface cover. The study was conducted in four locations across the southern United States during Summer 2015. Sprigging rates consisted of 200, 400, 600, and 800 U.S. bushels/acre (9.3 gal/bushel), and N rates were 0, 11, 22, and 44 lb/acre N per week. Results showed that as the N rate increased, percent cover generally increased but only slightly [7% difference between high and low rates 5 weeks after planting (WAP)]. The effect of sprig rate on percent cover indicated that as rate increased, cover also increased. Differences in establishment due to sprig rate were present until 6 WAP at which time all plots achieved 100% cover. The greatest difference between N and sprig rate was that sprig rate showed differences in percent cover immediately, whereas N rate differences were not apparent until 2 WAP. Increasing sprig rather than N rate should be considered to speed up establishment.

scholarly journals Differential Large Crabgrass Control with Herbicides in Tall Fescue and Common Bermudagrass

HortScience ◽  
1993 ◽  
Vol 28 (10) ◽  
pp. 1015-1016 ◽  
Author(s):  
B.J. Johnson
Keyword(s):  
Field Experiment ◽  
Tall Fescue ◽  
Festuca Arundinacea ◽  
Cynodon Dactylon ◽  
Late Summer ◽  
Application Rates ◽  
The Difference ◽  
Common Bermudagrass ◽  
Large Crabgrass

Pendimethalin and oxadiazon are used commonly to control crabgrasses (Digitaria spp.) in tall fescue (Festuca arundinacea Schreb.) and common bermudagrass [Cynodon dactylon (L.) Pers.]. A field experiment was conducted for 2 years to determine if reduced pendimethalin and oxadiazon application rates would control large crabgrass [D. sanguinalis (L.) Sco.] effectively in tall fescue and common bermudagrass. Oxadiazon applied at 1.1 kg a.i./ha in each of two applications at a 60-day interval (less than recommended rate) effectively controlled large crabgrass (≥93%), regardless of turfgrass species. Pendimethalin applied at 1.1 kg a.i./ha in each of two applications controlled large crabgrass in common bermudagrass effectively (≥90%) but not large crabgrass in tall fescue (47%). The difference in pendimethalin performance between the two species was attributed to the ability of common bermudagrass to compete more successfully than tall fescue with large crabgrass during late summer. Chemical names used: 3-[2,4-dichloro-5-(1-methylethoxy)phenyl]-5-(1,1-dimethylethy1)-l,3,4-oxadiazol-2-(3 H)-one (oxadiazon); N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenamine (pendimethalin).

scholarly journals Frequency of Drive (Quinclorac) Treatments on Common Bermudagrass Tolerance and on Large Crabgrass Control

1995 ◽  
Vol 13 (2) ◽  
pp. 104-108
Author(s):  
B. Jack Johnson
Keyword(s):  
Field Experiment ◽  
Weed Control ◽  
Cynodon Dactylon ◽  
Single Application ◽  
Digitaria Sanguinalis ◽  
Common Bermudagrass ◽  
Large Crabgrass

Abstract When a postemergence (POST) herbicide is used to control large crabgrass [Digitaria sanguinalis (L.) Scop.] in common bermudagrass [Cynodon dactylon (L.) Pers.], the herbicide should maintain optimum weed control for 8 to 10 weeks without causing undesirable injury to the turfgrass. A field experiment was conducted during 1993 and 1994 to determine the lowest rate of Drive (quinclorac) needed to control large crabgrass without causing undesirable injury to bermudagrass turf. Drive (quinclorac) applied at 0.28 kg ai/ha (0.25 lb ai/A) initially in early May and repeated at the same rate at a 2-week interval, controlled 85% large crabgrass for 16 weeks in 1993 and 70% for 10 weeks in 1994. The control in 1994 was 96% for 17 weeks when the herbicide was applied at 0.28 kg ai/ha (0.25 lb ai/A) in each of three applications on May 2, May 29, and June 13. The maximum bermudagrass injury in 1993 from Drive (quinclorac) applied at 0.28 kg ai/ha (0.25 lb ai/A) in each of two applications at 2- to 4-week interval was ≤ 27% compared to ≥ 33% when ≥ 0.56 kg ai/ha (≥ 0.5 lb ai/A) was applied as a single application. Bermudagrass treated initially with Drive (quinclorac) at 0.28 kg ai/ha (0.25 lb ai/A) was injured higher in 1994 (≤ 35%) than in 1993 (≤ 14%). Bermudagrass injury was ≥ 40% when the second application was delayed until mid- to late June either year or when the herbicide was applied in three applications during May and June 1994.

Mature Goosegrass (Eleusine indica) Control in Bermudagrass (Cynodon dactylon) Turf with a Metribuzin–Diclofop Combination

1999 ◽  
Vol 13 (1) ◽  
pp. 169-171 ◽  
Author(s):  
Roy K. Nishimoto ◽  
Charles L. Murdoch
Keyword(s):  
Cynodon Dactylon ◽  
Field Studies ◽  
Field Trials ◽  
Single Application ◽  
Eleusine Indica ◽  
Selective Control ◽  
Common Bermudagrass

Field studies were conducted to determine if metribuzin–diclofop combinations could provide selective control of mature goosegrass in common bermudagrass turf. In two field trials, diclofop at 1.7 kg ai/ha provided 19% control of mature goosegrass at 7 wk after treatment (WAT), whereas metribuzin at 0.28 or 0.56 kg ai/ha controlled 30 and 53%, respectively. When diclofop at 1.7 kg/ha was combined with metribuzin at 0.28 or 0.56 kg/ha, goosegrass control increased to 68 and 90%, respectively. That degree of mature goosegrass control with a single application of metribuzin at 0.56 kg/ha plus diclofop at 1.7 kg/ha was equivalent to metribuzin at 0.56 kg/ha plus MSMA at 2.2 kg ae/ha followed by MSMA at 2.2 kg/ha 1 wk later. The metribuzin–diclofop combination injured common bermudagrass turf less than or equivalent to the metribuzin–MSMA combination. The injury was transitory; at 3 WAT, none of the treatments injured common bermudagrass.

Reduced herbicide rates for large crabgrass (Digitaria sanguinalis) and goosegrass (Eleusine indica) control in bermudagrass (Cynodon dactylon)

Weed Science ◽  
1997 ◽  
Vol 45 (2) ◽  
pp. 283-287 ◽  
Author(s):  
B. Jack Johnson
Keyword(s):  
Weed Management ◽  
Cynodon Dactylon ◽  
Digitaria Sanguinalis ◽  
Eleusine Indica ◽  
Reduced Rate ◽  
Common Bermudagrass ◽  
Large Crabgrass

Five PRE herbicides were applied at below maximum registered use rates to the same bermudagrass turf plots for three consecutive years for large crabgrass and goosegrass control. In most instances, full labeled herbicide rates were needed for acceptable large crabgrass and goosegrass control during the 1st year of treatment. All herbicides controlled large crabgrass but not goosegrass during the 1st year. Weed management programs that utilized the lowest herbicide rates while maintaining ≥ 80% control during the 2nd and 3rd years varied with herbicides. The programs for large crabgrass were prodiamine at 0.8 kg ha−1the 1st year followed by 0.2 kg ha−1the 2nd and 3rd years; oryzalin at 2.2 kg ha−1the 1st year followed by 0.6 kg ha−1the 2nd and 3rd years; dithiopyr at 0.3 kg ha−1the 1st year followed by 0.1 kg ha−1the 2nd and 3rd years; pendimethalin at 1.7 kg ha−1the 1st year followed by 0.8 kg ha−1the 2nd and 3rd years; and oxadiazon at 3.4 kg hha−1the 1st year followed by 2.5 kg ha−1the 2nd year and 1.7 kg ha−1the 3rd year. The programs for goosegrass were prodiamine at 0.8 kg ha−1followed by 0.6 kg ha−1the 2nd and 0.4 kg ha−1the 3rd year; dithiopyr at 0.8 kg ha−1the 1st year followed by 0.4 kg ha−1the 2nd and 3rd years; pendimethalin at 3.4 kg ha−1the 1st year followed by 1.7 kg ha−1the 2nd year and 0.8 kg ha−1the 3rd year; and oxadiazon at 3.4 kg ha−1followed by 0.8 kg ha−1the 2nd and 3rd years. Because goosegrass control with oryzalin at reduced rates was unacceptable during the 1st and 2nd years, this herbicide should not be used in a reduced rate program. The quality of common bermudagrass was not affected by reduced herbicide rates.

Bermudagrass (Cynodon dactylon) Control with Postemergence Herbicides in Peanut (Arachis hypogaea)

1989 ◽  
Vol 3 (2) ◽  
pp. 267-271 ◽  
Author(s):  
W. James Grichar ◽  
Thurman E. Boswell
Keyword(s):  
Arachis Hypogaea ◽  
Field Experiments ◽  
Cynodon Dactylon ◽  
Variable Control ◽  
Coastal Bermudagrass ◽  
Common Bermudagrass ◽  
Postemergence Herbicides ◽  
Better Than

Field experiments were conducted from 1983 through 1987 to evaluate various postemergence grass herbicides on bermudagrass in peanuts. Fluazifop, haloxyfop, and SC-1084 applied once effectively controlled common bermudagrass when less than 8 cm tall, but resulted in variable control when applied to bermudagrass 15 cm or taller. Sethoxydim effectively controlled common bermudagrass one of 2 yr. ‘Coastal’ bermudagrass required two applications of BAS 517, fluazifop-P at 0.21 or 0.28 kg ai/ha, and haloxyfop for control of better than 88%. Clethodim and sethoxydim provided poor to fair control, respectively.

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