Common Chickweed Control in Established Alfalfa

Weed Science ◽  
1973 ◽  
Vol 21 (2) ◽  
pp. 119-122 ◽  
Author(s):  
George Kapusta
Keyword(s):  
Medicago Sativa ◽  
Weed Control ◽  
Stellaria Media ◽  
Control Efficacy ◽  
Crop Tolerance ◽  
Predominant Species ◽  
Herbicide Treatments ◽  
Winter Annual

Herbicide treatments were applied to established alfalfa (Medicago sativaL.) in 1969 and 1970 to determine winter annual weed control efficacy, crop tolerance, and influence on alfalfa yield and protein. Common chickweed (Stellaria media(L.) Cyrillo) was the predominant species in both years. Excellent weed control was achieved in 1969 with 2-sec-butylamino-4-ethylamino-6-methoxy-s-triazine (GS 14254) at 1.7 kg/ha, 2-[[4-chloro-6-(ethylamino)-s-triazin-2-yl]amino]-2-methyl-propionitrile (cyanazine) at 4.5 kg/ha, 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine) at 1.7 kg/ha, and 3-tert-butyl-5-chloro-6-methyluracil (terbacil) at 1.1 kg/ha. Several other treatments also significantly reduced weed yields. All herbicides significantly reduced weed yields in 1970. First harvest alfalfa yields in 1969 were not increased significantly despite the excellent weed control afforded by several treatments. Second harvest alfalfa yields did not differ significantly, however, weeds were not a problem in the regrowth. In 1970 four of the 19 treatments did yield significantly more than control plots. Alfalfa protein was not altered by any of the treatments either year.

Winter Annual Weed Control in Dormant Bermudagrass Turf

Weed Science ◽  
1977 ◽  
Vol 25 (2) ◽  
pp. 145-150 ◽  
Author(s):  
B.J. Johnson
Keyword(s):  
Weed Control ◽  
Propionic Acid ◽  
Cynodon Dactylon ◽  
Single Treatment ◽  
Weed Species ◽  
Stellaria Media ◽  
Herbicide Treatments ◽  
Excellent Control ◽  
Winter Annual

Control of annual broadleaf winter weeds in dormant bermudagrass [Cynodon dactylon(L.) Pers. ‘Common’] by a variety of herbicides was examined. Nearly all treatments allowed good to excellent control of spur weed (Soliva sessilisP. and K.). Metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazine-5(4H)one] was the only tested herbicide that controlled all weed species consistently with a single treatment. Bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-(4) 3H-one 2,2-dioxide] applied alone as single or repeated treatments controlled spur weed, parsley-piert (Alchemilla microcorpaBoissier Reuter), and chickweed [Stellaria media(L.) Cyrillo], but a combination of bentazon and silvex [2-(2,4,5-trichlorophenoxy)propionic acid] were needed for acceptable control of henbit (Lamium amplexicauleL.) and corn speedwell (Veronica arvensisL.). None of the herbicide treatments affected green-up of bermudagrass the following spring.

Effects of Weed Control in Established Alfalfa (Medicago sativa) on Forage Yield and Quality

Weed Science ◽  
1987 ◽  
Vol 35 (4) ◽  
pp. 564-567 ◽  
Author(s):  
Dennis R. Cosgrove ◽  
Michael Barrett
Keyword(s):  
Medicago Sativa ◽  
Weed Control ◽  
Stand Density ◽  
Forage Yield ◽  
Control Measures ◽  
Acid Detergent Fiber ◽  
Yield And Quality ◽  
Herbicide Treatments ◽  
Forage Yields

The effects of weed control measures in established alfalfa (Medicago sativaL.) on forage yield and quality were investigated at three sites with varying alfalfa densities and weed populations. Herbicide treatments were 0.56 and 1.12 kg/ha metribuzin [4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] applied in fall or spring, respectively, 1.68 kg/ha pronamide [3,5-dichloro (N-1,1-dimethyl-2-propynyl)benzamide] applied in fall, and combinations of these treatments. First-harvest forage yields (weeds plus alfalfa) were either reduced or unchanged by herbicide treatments. Total forage yield was not altered by the herbicide treatments, but first-harvest and total alfalfa yield as well as first-harvest forage protein content were increased by several treatments, depending on stand density and weed pressure. Little effect was observed on in vitro digestible dry matter or acid detergent fiber content.

Effects of Repeated Herbicide Applications on Alfalfa(Medicago sativa)

Weed Science ◽  
1978 ◽  
Vol 26 (2) ◽  
pp. 151-153 ◽  
Author(s):  
D. G. Swan
Keyword(s):  
Medicago Sativa ◽  
Weed Control ◽  
Bromus Tectorum ◽  
Downy Brome ◽  
Crop Tolerance ◽  
Average Control

Six herbicides, simazine [2-chloro-4,6-bis(ethylamino)-s-triazine], propham (isopropyl carbanilate), terbacil (3-tert-butyl-5-chloro-6-methyluracil), carbetamide [D-N-ethyllactamide carbanilate (ester)], pronamide [3,5-dichloro(N-1,1-dimethyl-2-propynyl)benzamide], and secbumeton [N-ethyl-6-methoxy-N′(1-methylpropyl)-1,3,5-triazine-2,4-diamine] were applied annually for four years to establish forage alfalfa(Medicago sativaL. ‘Washoe’). Downy brome(Bromus tectorumL.) control ranged from 80 to 100%. The average control of broadleaf weeds was 90 to 100% with simazine, terbacil, and secbumeton, compared to 30 to 40% with propham, carbetamide, and pronamide. Only simazine and terbacil were phytotoxic to the alfalfa. Based on weed control and crop tolerance, secbumeton performed best on the coarsetextured soil in this experiment.

Chemical Approaches for Improving Herbicide Selectivity and Crop Tolerance

Weed Science ◽  
1987 ◽  
Vol 35 (S1) ◽  
pp. 24-27 ◽  
Author(s):  
G. R. Stephenson ◽  
G. Ezra
Keyword(s):  
Weed Control ◽  
Plant Species ◽  
Mode Of Action ◽  
Crop Plants ◽  
Control Efficacy ◽  
New Approach ◽  
Crop Tolerance ◽  
Important Crop ◽  
Herbicide Metabolism ◽  
Equal Efficacy

Combinations of antagonistic herbicides can be helpful in the search for seed-applied chemical safeners to protect crop plants from herbicide injury. If a particular herbicide combination is selectively antagonistic so that the crop is not injured but weed control efficacy is not reduced, it should be possible to develop a new, more selective formulation of the herbicide which includes the antagonist or antidote. A promising new approach involves the use of early pretreatments of crop plants with subtoxic levels of a particular herbicide to increase crop tolerance to later, higher rates of that herbicide. When there are different mechanisms for herbicide detoxification in different plant species, it should also be possible to develop selective herbicide synergists that would provide equal efficacy at lower rates with greater crop tolerance. As our knowledge of herbicide metabolism and mode of action develops, it will be increasingly possible to use other chemicals to selectively synergize or safen herbicides to solve problems in important crop-weed situations.

Preemergence Weed Control in Row Middles of Polyethylene-Mulched Cauliflower (Brassica oleracea)

1989 ◽  
Vol 3 (2) ◽  
pp. 340-344 ◽  
Author(s):  
James P. Gilreath ◽  
Daniel A. Botts ◽  
William M. Stall ◽  
Joan A. Dusky
Keyword(s):  
Brassica Oleracea ◽  
Weed Control ◽  
Control Efficacy ◽  
Herbicide Treatments ◽  
Plant Stand ◽  
Preemergence Herbicides ◽  
Stand Yield

Four experiments were conducted in 1985 and 1986 at three locations to assess weed control efficacy and phytotoxicity of several preemergence herbicides applied between beds (row middles) of polyethylene-mulched cauliflower grown on raised beds. Efficacy of most herbicide treatments varied among the four experiments; however, 4.5 kg ai/ha diethatyl and tank mixes of oxyfluorfen with cinmethylin consistently controlled weeds best. Plant stand, yield, and cauliflower curd size were not affected by treatment for any of the varieties used at any of the locations.

Manipulation of sunflower population density and herbicide rate for economical and sustainable weed management

2021 ◽  
Vol 26 (4) ◽  
pp. 2751-2758
Author(s):  
EDITA ŠTEFANIĆ ◽  
SLAVICA ANTUNOVIĆ ◽  
BOŽICA JAPUNDŽIĆ-PALENKIĆ ◽  
DINKO ZIMA
Keyword(s):  
Population Density ◽  
Weed Control ◽  
Crop Yield ◽  
Weed Management ◽  
Management Strategies ◽  
Control Efficacy ◽  
Economic Return ◽  
Crop Density ◽  
Herbicide Treatments ◽  
Weed Infestation

Field study tested weed control efficacy, crop yield and economic return using various weed management strategies in sunflower growing with different population density. Treatments included four rates of PRE emergence application of S-metolachlor + fluchloridon and one POST emergence application of flumioxazin + quizalofop-pethyl. PRE-em application (1.4 + 2.4 and 1.2 + 2.0) provided at the higher crop densities (70 000) best weed control. However, PRE- em treatments with lower doses (0.8 + 1.6 and 1.0 + 1.8) and POST- em application did not maintain acceptable control of dominant weeds. Grain yield increased with the crop density, but did not statistically differ between applied herbicide treatments. Finally, the implication of this study demonstrated that sole application of tested herbicide treatments at higher crop sowing density (60 000 and 70 000) was found to be economically the best alternative strategy for reducing weed infestation and achieving a better yield.

Weed management at the time of perennial cereal rye establishment

2002 ◽  
Vol 82 (2) ◽  
pp. 457-462
Author(s):  
J. R. Moyer ◽  
S. N. Acharya ◽  
Z. Mir
Keyword(s):  
Weed Control ◽  
Weed Management ◽  
Dry Matter ◽  
Research Centre ◽  
Annual Grass ◽  
Cereal Rye ◽  
Crop Tolerance ◽  
Herbicide Treatments ◽  
Acid Detergent Fibre ◽  
New Crop

Perennial cereal rye (PC rye) is a new crop that is being developed at the Lethbridge Research Centre for the production of silage for cattle. Its ability to compete with weeds during establishment and tolerance to herbicides for weed control was unknown. Therefore, experiments were established with PC rye, and several herbicide treatments were applied to test crop tolerance and weed control. PC rye was not injured by bromoxynil/MCPA, 2,4-D, thifensulfuron/tribenuron, fenoxaprop, clodinafop-propargyl, and tralkoxydim. Combinations of herbicides for broadleaf weed control and annual grass control usually reduced weed dry matter (DM) to < 5 g m-2 in the establishment year. Weeds made up 20 to 36% of the total DM when herbicides were not applied. However, this level of weed content did not affect the digestibility of the forage samples or the total DM produced as weed DM compensated for reduced PC rye yield in weedy plots. Also, the presence of weeds during establishment of PC rye did not affect weed content or PC rye yields the year after establishment. Key words: Acid detergent fibre, digestibility, neutral detergent fibre, perennial cereal rye, weed control, yield

Weed management in white beans with postemergence herbicide tankmixes

2013 ◽  
Vol 93 (4) ◽  
pp. 669-674 ◽  
Author(s):  
Nader Soltani ◽  
Robert E. Nurse ◽  
Peter H. Sikkema
Keyword(s):  
Adverse Effect ◽  
Weed Control ◽  
Weed Management ◽  
Field Studies ◽  
Control Efficacy ◽  
Weed Density ◽  
Herbicide Treatments ◽  
White Bean ◽  
Effect On Yield ◽  
Density And Biomass

Soltani, N., Nurse, R. E. and Sikkema, P. H. 2013. Weed management in white beans with postemergence herbicide tankmixes. Can. J. Plant Sci. 93: 669–674. Weed control efficacy of cloransulam-methyl, halosulfuron, bentazon, fomesafen and their tankmixes applied post-emergence (POST) for weed management in white bean was evaluated in field studies conducted in four Ontario locations during 2008–2011. Cloransulam-methyl, halosulfuron, bentazon, fomesafen, bentazon plus fomesafen, cloransulam-methyl plus bentazon, cloransulam-methyl plus fomesafen, cloransulam-methyl plus bentazon plus fomesafen, halosulfuron plus bentazon, halosulfuron plus fomesafen, and halosulfuron plus bentazon plus fomesafen caused white bean injury ranging from 1 to 18%. Control for AMARE, AMBEL and CHEAL ranged from 47 to 92%, 66 to 98% and 36 to 91%, respectively, among herbicide treatments. Similar results were observed for weed density and biomass of AMARE, AMBEL, and CHEAL. Cloransulam-methyl, halosulfuron, and cloransulam-methyl plus fomesafen reduced the yield of white bean by 34, 21, and 17%, respectively, compared with the weed-free control. However, bentazon, fomesafen, bentazon plus fomesafen, cloransulam-methyl plus bentazon, cloransulam-methyl plus bentazon plus fomesafen, halosulfuron plus bentazon, halosulfuron plus fomesafen, and halosulfuron plus bentazon plus fomesafen had no adverse effect on yield of white bean. Based on these results, tankmixes of cloransulam-methyl and halosulfuron with bentazon and fomesafen can reduce crop injury and provide control of broadleaf weeds in white bean.

Preemergence Broadleaf Weed Control and Crop Tolerance in Imidazolinone-Resistant and -Susceptible Corn (Zea mays)

1997 ◽  
Vol 11 (1) ◽  
pp. 118-122 ◽  
Author(s):  
Christy L. Sprague ◽  
Edward W. Stoller ◽  
Stephen E. Hart
Keyword(s):  
Zea Mays ◽  
Weed Control ◽  
Field Studies ◽  
Susceptible Variety ◽  
Common Lambsquarters ◽  
Crop Tolerance ◽  
Herbicide Treatments ◽  
Ac 263,222 ◽  
Low Rate

Field studies were conducted in 1994 and 1995 at Dekalb and Urbana, IL, to evaluate preemergence broadleaf weed control and crop tolerance in imidazolinone resistant (IR) and susceptible (non-IR) corn using atrazine, imazethapyr, AC 263,222, CGA-152005, MON 12000 with and without MON 13900 (a safener), and flumetsulam + clopyralid. When sufficient rainfall occurred within 28 d of application to insure herbicide absorption, the IR corn variety was more tolerant than the susceptible variety to imazethapyr, AC 263,222, CGA-152005 at 40 and 80 g/ha, and MON 12000 with and without MON 13900. Overall crop tolerance of IR corn was equal to that of corn treated with atrazine for all herbicide treatments except CGA-152005, which injured IR corn. Control of velvetleaf, common lambsquarters, Pennsylvania smartweed, tall morningglory, and jimsonweed for all herbicide treatments was equal or superior to that of atrazine at 1.7 kg/ha. However, control of common cocklebur was significantly greater with atrazine compared to imazethapyr and the low rate of CGA-152005.

scholarly journals Phytotoxicity and Weed Control Efficacy of Three Non-labeled Herbicides for Field-grown Hemerocallis spp.

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 745D-745
Author(s):  
Patricia R. Knight* ◽  
Christine E. Coker ◽  
Benedict Posadas ◽  
John M. Anderson
Keyword(s):  
Weed Control ◽  
Control Treatment ◽  
Separate Experiment ◽  
Control Efficacy ◽  
Random Design ◽  
Herbicide Treatment ◽  
Herbicide Treatments ◽  
Number Percentage ◽  
Field Production

The IR-4 program works to identify potential minor-use horticultural chemicals and evaluate them for phytotoxicity and efficacy. The objective of this experiment was to evaluate phytotoxicity and weed control of three unlabeled herbicides on field production of Hemerocallis spp. `Ming Toy'. Ten-cm pots of `Ming Toy' were planted into the field 16 July 2001. Each plot consisted of 3 plants per treatment with 6 replications in a completely random design. Each herbicide was analyzed as a separate experiment. Herbicide treatments consisted of clopyralid (0.14, 0.28, 0.56, or 1.1 kg·ha-1 a.i.), clethodim (125, 250, or 500 mL·L-1 a.i.), or bentazon (1.1, 2.2, or 4.4 kg·ha-1 a.i.). Data collected included weed number, percentage of weed coverage (% weed coverage), and phytotoxicity and foliar color ratings for `Ming Toy'. Clopyralid reduced total weed number 90 DAT although % weed coverage was similar or worse compared to the control treatment. Phytotoxicity 90 DAT was not significant for plants treated with clopyralid, but foliar color ratings were reduced. Application of clethodim to `Ming Toy' plots, regardless of rate, resulted in similar weed numbers compared to the control 49 DAT. Clethodim application, regardless of rate, reduced % weed coverage compared to the control treatment. Phytotoxicity 90 DAT was not significant, regardless of herbicide treatment, but foliar color ratings were lower for herbicide treated plants compared to the control. Bentazon, regardless of rate, reduced weed number and % weed coverage 49 DAT compared to the control. Phytotoxicity was similar to the control for plants treated with 1.1 kg·ha-1 a.i.

Sign in / Sign up

Export Citation Format

Share Document