Herbicide Control of Coppicing in Teak

1958 ◽  
Vol 120 (1) ◽  
pp. 59-61 ◽  
Author(s):  
Philip Ross
Keyword(s):  
Herbicide Control

Economic decision rules for postemergence herbicide control of barnyardgrass (Echinochloa crus-galli) in corn (Zea mays)

Weed Science ◽  
1997 ◽  
Vol 45 (4) ◽  
pp. 557-563 ◽  
Author(s):  
Aca Č. Bosnić ◽  
Clarence J. Swanton
Keyword(s):  
Weed Control ◽  
Economic Model ◽  
Control Function ◽  
Decision Rules ◽  
Dry Weight ◽  
Practical Significance ◽  
Corn Yield ◽  
Economic Decision ◽  
Weed Emergence ◽  
Herbicide Control

Economic decision rules for postemergence herbicide control of barnyardgrass in corn were developed. Damage and control functions that formed the basis of an economic model were estimated. Barnyardgrass density and time of emergence relative to the crop were fundamental to calculate the damage function. The control function described barnyardgrass dry weight response to variable doses of two herbicides. Both the biologist's and economist's weed control decision rules, derived from the economic model, were influenced by time of weed emergence relative to the crop, corn yield, and price. Inclusion of time of weed emergence relative to the crop improved our interpretative ability of derived decision rules. The biologist's threshold weed density was more sensitive to changes in parameter values than the economist's optimal herbicide dose strategy. Herbicide use with recommended label dose was greater than either the economically optimal or the biologically effective doses. Use of the biologically effective dose for postemergence weed control decisions was cost efficient and could be of practical significance to corn growers.

Herbicide Control ofEucleaSp.

1966 ◽  
Vol 32 (2) ◽  
pp. 117-125 ◽  
Author(s):  
J. W. P. L. Parker ◽  
Alison M. Parker
Keyword(s):  
Herbicide Control

Initial and Residual Herbicide Control of Crabgrass (Digitariaspp.) in Bermudagrass (Cynodon dactylon) Turf

Weed Science ◽  
1983 ◽  
Vol 31 (5) ◽  
pp. 619-622 ◽  
Author(s):  
L. M. Callahan ◽  
J. R. Overton ◽  
W. L. Sanders
Keyword(s):  
Cynodon Dactylon ◽  
Digitaria Sanguinalis ◽  
Common Bermudagrass ◽  
Residual Herbicide ◽  
Large Crabgrass ◽  
Herbicide Control

Over 9 yr, bandane (polychlorodicyclopentadiene isomers) at 67 kg/ha, bensulide [O,O-diisopropyl phosphorodithioateS-ester withN-(2-mercaptoethyl)benzenesulfonamide] at 11 and 22 kg/ha, DCPA (dimethyl tetrachloroterephthalate) at 22 kg/ha, and terbutol (2,6-di-tert-butyl-p-tolyl methylcarbamate) at 22 kg/ha applied preemergence controlled 94 to 100% of large crabgrass [Digitaria sanguinalis(L.) Scop. # DIGSP] in a lawn of common bermudagrass [Cynodon dactylon(L.) Pers. # CYNDA]. Control from benefin (N-butyl-N-ethyl-α,α,α-trifluoro-2,6-dinitro-p-toluidine) at 5 kg/ha, DCPA at 11 kg/ha, simazine [2-chloro-4,6-bis(ethylamino)-s-triazine] at 5 kg/ha, and terbutol at 11 kg/ha was 90 to 99%. Bandane and bensulide persisted in soil to control large crabgrass a year after treatment.

Response of Suppressed White Pine Saplings to Release During Shelterwood Cutting

1993 ◽  
Vol 10 (4) ◽  
pp. 166-169 ◽  
Author(s):  
Matthew J. Kelty ◽  
Petya K. Entcheva
Keyword(s):  
New England ◽  
Height Growth ◽  
White Pine ◽  
Pine Seedlings ◽  
Sprout Growth ◽  
Herbicide Control

Abstract The need for herbicide control of hardwood understories is widely recognized for successful regeneration of white pine, because of the slow height growth of pine seedlings; however, it is often not carried out in the low-investment silviculture frequently practiced in New England. This study examined the ability of suppressed white pine saplings to respond to release following a shelterwood establishment cut where no hardwood control was done. Measurements of regeneration were made 11 yr after cutting in a mature pine-oak stand on a till soil in central Massachusetts. Pine seedlings established after the cut were surpassed in height by hardwood seedling and sprout growth. Older suppressed pine saplings which predated the establishment cut (10 to 38 yr old at the time of the cut, with mean heights of 0.4 to 2.0 m) quickly responded to release and grew to mean heights of 3.8 to 5.1 m 11 yr after cutting; these were within 1.5 m of the height of the tallest hardwoods. Retention of older pine saplings during shelterwood establishment cutting may provide a way of maintaining a white pine component in newly regenerated stands, particularly where herbicide control of hardwood competition is not planned. North. J. Appl. For. 11(1):166-169.

Preharvest Herbicide Control of Undesirable Vegetation in Southern Appalachian Hardwoods

1978 ◽  
Vol 2 (2) ◽  
pp. 51-54 ◽  
Author(s):  
David L. Loftis
Keyword(s):  
Southern Appalachian ◽  
Herbicide Treatment ◽  
Conventional Practice ◽  
Appalachian Hardwoods ◽  
Herbicide Control

Abstract Four years after clearcutting in a study comparing preharvest herbicide treatment of undesirable and unmerchantable vegetation with postharvest felling (the conventional practice), the preharvest treatment (1) reduced the number of sprouts of undesirable species, (2) increased the proportion of desirable species in the dominant stand, and (3) increased the proportion of the desirable stems of seedling origin. Although the preharvest treatment was more expensive than postharvest felling in this study, the results suggest that a less costly, but equally effective preharvest herbicide treatment could be devised.

Control of velvetleaf (Abutilon theophrasti) at two heights with POST herbicides in Nebraska popcorn

2020 ◽  
Vol 34 (4) ◽  
pp. 560-567
Author(s):  
Ethann R. Barnes ◽  
Stevan Z. Knezevic ◽  
Nevin C. Lawrence ◽  
Suat Irmak ◽  
Oscar Rodriguez ◽  
...  
Keyword(s):  
Field Experiments ◽  
Residual Activity ◽  
Abutilon Theophrasti ◽  
Field Corn ◽  
Contrast Analysis ◽  
Main Plot ◽  
Herbicide Programs ◽  
Biomass Reduction ◽  
Plot Design ◽  
Herbicide Control

AbstractVelvetleaf is an economically important weed in popcorn production fields in Nebraska. Many PRE herbicides in popcorn have limited residual activity or provide partial velvetleaf control. There are a limited number of herbicides applied POST in popcorn compared with field corn, necessitating the evaluation of POST herbicides for control of velvetleaf. The objectives of this study were to (1) evaluate the efficacy and crop safety of labeled POST herbicides for controlling velvetleaf that survived S-metolachlor/atrazine applied PRE and (2) determine the effect of velvetleaf height on POST herbicide efficacy, popcorn injury, and yield. Field experiments were conducted in 2018 and 2019 near Clay Center, Nebraska. The experiments were arranged in a split-plot design with four replications. The main plot treatments were velvetleaf height (≤15 cm and ≤30 cm) and subplot treatments included a no-POST herbicide control, and 11 POST herbicide programs. Fluthiacet-methyl, fluthiacet-methyl/mesotrione, carfentrazone-ethyl, dicamba, and dicamba/diflufenzopyr provided greater than 96% velvetleaf control 28 d after treatment (DAT), reduced velvetleaf density to fewer than 7 plants m−2, achieved 99% to 100% biomass reduction, and had no effect on popcorn yield. Herbicide programs tested in this study provided greater than 98% control of velvetleaf 28 DAT in 2019. Most POST herbicide programs in this study provided greater than 90% control of up to 15 cm and up to 30 cm velvetleaf and no differences between velvetleaf heights in density, biomass reduction, or popcorn yield were observed, except with topramezone and nicosulfuron/mesotrione 28 DAT in 2018. On the basis of contrast analysis, herbicide programs with fluthiacet-methyl or dicamba provided better control than herbicide programs without them at 28 DAT in 2018. It is concluded that POST herbicides are available for control of velvetleaf up to 30-cm tall in popcorn production fields.

Italian Ryegrass (Lolium multiflorum) Control in Newly Seeded Tall Fescue

2005 ◽  
Vol 19 (2) ◽  
pp. 416-421 ◽  
Author(s):  
Josh B. Beam ◽  
Whitnee L. Barker ◽  
Shawn D. Askew
Keyword(s):  
Tall Fescue ◽  
Initial Treatment ◽  
Lolium Multiflorum ◽  
Kentucky Bluegrass ◽  
Italian Ryegrass ◽  
Cool Season ◽  
Control Options ◽  
Herbicide Control

Infestations of Italian ryegrass are difficult to control and decrease marketability of cool-season sod. Tests were conducted at three locations in Virginia in 2002 and 2003 to determine herbicide control options for Italian ryegrass in 90:10 tall fescue: Kentucky bluegrass turfgrass seeded the previous fall. Chlorsulfuron, diclofop, fluazifop plus fenoxaprop, and metsulfuron controlled 5- to 30-tiller Italian ryegrass less than 50% 10 wk after initial treatment (WAIT). Nicosulfuron at 53 g ai/ha controlled Italian ryegrass 69 to 95% and injured turf no greater than 10% at all locations 10 WAIT. Primisulfuron at 53 g ai/ha controlled Italian ryegrass less than 30% in 2002 and 59 to 63% at two locations in 2003 10 WAIT and injured turf less than 5% at all locations. Results indicate nicosulfuron can be used for Italian ryegrass control in tall fescue or tall fescue and Kentucky bluegrass turf if temporary injury is acceptable.

Herbicide Control Strategies for Ventenata dubia in the Intermountain Pacific Northwest

2016 ◽  
Vol 9 (2) ◽  
pp. 128-137 ◽  
Author(s):  
John M. Wallace ◽  
Timothy S. Prather
Keyword(s):  
Pacific Northwest ◽  
Control Strategies ◽  
Integrated Management ◽  
Perennial Grass ◽  
Grass Species ◽  
Intermediate Wheatgrass ◽  
Herbicide Treatments ◽  
Exotic Annual Grass ◽  
Grass Growth ◽  
Herbicide Control

Ventenata dubia is an exotic annual grass that has become increasingly invasive in various perennial grass systems throughout the Intermountain Pacific Northwest. Currently, little information is available to landowners about herbicide control options. In our first field study, we evaluated V. dubia control efficacy and perennial grass tolerance of herbicides applied pre-emergence (PRE) at two locations and as an early postemergence (EPOST) application at four different conservation reserve grasslands, with each grassland dominated by different perennial grass species. Treatments included flufenacet plus metribuzin (303 + 76 g ai ha−1 [0.27 + 0.07 lb ai ac−1]), propoxycarbazone-sodium (49 g ai ha−1 [0.04 lb ai ac−1]), rimsulfuron (53 g ai ha−1 [0.05 lb ai ac−1]), sulfosulfuron (53 g ai ha−1 [0.05 lb ai ac−1]), and imazapic (105 g ai ha−1 [0.09 lb ai ac−1]). Rimsulfuron and flufenacet plus metribuzin applied PRE provided > 90% control 10 mo after treatment (MAT). Rimsulfuron and sulfosulfuron applied EPOST provided > 90% control 9 MAT. Herbicide injury to bluebunch and intermediate wheatgrass was negligible across treatments. Imazapic and sulfosulfuron applied EPOST resulted in significant injury to smooth brome and timothy. In our second study, we addressed the following question: Will fall herbicide plus fertilizer treatments improve V. dubia control compared with herbicide treatments alone? We imposed fall herbicide treatments in main plots and fertilizer treatments (fall N, fall P, fall K, fall PK, spring N, NPK) in split plots at three study locations. Herbicide treatments resulted in high levels of V. dubia control. Differences in V. dubia abundance among fertilizer treatments were negligible 9 MAT. Within herbicide control plots, spring N and NPK treatments resulted in significant increases in perennial grass cover and decreases in V. dubia cover (9 MAT). This result indicates that spring N applications timed to the onset of perennial grass growth could be utilized as a component of an integrated management strategy for V. dubia in invaded perennial grass systems.

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