Influence of Diflufenzopyr Addition to Picolinic Acid Herbicides for Russian Knapweed (Acroptilon repens) Control

2009 ◽  
Vol 23 (3) ◽  
pp. 450-454 ◽  
Author(s):  
Stephen F. Enloe ◽  
Andrew R. Kniss
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Picolinic Acid ◽  
Weed Species ◽  
Pyridine Carboxylic Acid ◽  
Russian Knapweed ◽  
Pyridine Carboxylic ◽  
Acroptilon Repens ◽  
Acid Herbicides

Diflufenzopyr is a synergist that has improved the efficacy of certain auxin-type herbicides such as dicamba on many broadleaf weed species. However, little is known regarding the activity of diflufenzopyr with other auxin-type herbicides. Russian knapweed is an invasive creeping perennial that is susceptible to certain pyridine carboxylic acids, which are auxin-type herbicides. The objective of this research was to determine if the addition of diflufenzopyr to three pyridine carboxylic acid herbicides enhances long-term control of Russian knapweed in Wyoming. All treatments were applied in the fall. Treatments included aminopyralid (0, 0.05, 0.09, and 0.12 kg ae/ha), clopyralid (0, 0.16, 0.21, 0.31, and 0.42 kg ae/ha) and picloram (0, 0.14, 0.28, 0.42, and 0.56 kg ae/ha), applied with and without diflufenzopyr (0.06 and 0.11 kg ae/ha). Twelve mo after treatment (MAT), diflufenzopyr had no significant impact on Russian knapweed control with either aminopyralid or picloram, and had significant but inconsistent impacts on knapweed control with clopyralid. At 24 MAT, diflufenzopyr did not enhance Russian knapweed control with either aminopyralid or clopyralid and was slightly antagonistic with picloram. These results indicate that the addition of diflufenzopyr does not improve Russian knapweed control with fall applications of either aminopyralid, clopyralid, or picloram.

Relative activity comparison of aminocyclopyrachlor to pyridine carboxylic acid herbicides

2019 ◽  
Vol 34 (3) ◽  
pp. 402-407
Author(s):  
Benjamin P. Sperry ◽  
José Luiz C. S. Dias ◽  
Candice M. Prince ◽  
Jason A. Ferrell ◽  
Brent A. Sellers
Keyword(s):  
Carboxylic Acid ◽  
Dose Response ◽  
Relative Activity ◽  
Herbicidal Activity ◽  
Pyridine Carboxylic Acid ◽  
Use Patterns ◽  
Whole Plant ◽  
Pyridine Carboxylic ◽  
Acid Herbicides ◽  
Activity Comparison

AbstractThe pyridine carboxylic acid (PCA) herbicide family can exhibit differential activity within and among plant species, despite molecular resemblances. Aminocyclopyrachlor (AMCP), a pyrimidine carboxylic acid, is a recently discovered compound with similar use patterns to those of the PCA family; however, relative activity among PCAs and AMCP is not well understood. Therefore, the objective of this study was to quantify relative activity among aminopyralid, picloram, clopyralid, triclopyr, and AMCP in canola, squash, and okra using dose-response whole-plant bioassays. Clopyralid was less active than all other herbicides in all species and did not fit dose-response models. Aminopyralid and picloram performed similarly in squash (ED50 = 21.1 and 23.3 g ae ha−1, respectively). Aminopyralid was 3.8 times and 1.7 times more active than picloram in canola (ED50 = 60.3 and 227.7 g ha−1, respectively) and okra (ED50 = 10.3 and 17.3 g ha−1, respectively). Triclopyr (ED50 = 37.3 g ha−1) was more active than AMCP (ED50 = 112.9 g ha−1) and picloram in canola. Aminocyclopyrachlor (ED50 = 6.6 g ha−1) and triclopyr (ED50 = 7.8 g ha−1) were more active in squash than aminopyralid and picloram. In okra, AMCP (ED50 = 14.6 g ha−1) and aminopyralid (ED50 = 10.3 g ha−1) performed similarly but were more active than triclopyr (ED50 = 88.2 g ha−1). Herbicidal activity among AMCP and PCAs was vastly different despite molecular similarities that could be due to variable target-site sensitivity among species.

scholarly journals Investigations of the reactivity of pyridine carboxylic acids with diazodiphenylmethane in protic and aprotic solvents: Part II: Pyridine mono-carboxylic acid N-oxides

2006 ◽  
Vol 71 (2) ◽  
pp. 89-101 ◽  
Author(s):  
Sasa Drmanic ◽  
Bratislav Jovanovic ◽  
Aleksandar Marinkovic ◽  
Milica Misic-Vukovic
Keyword(s):  
Regression Analysis ◽  
Reaction Mechanism ◽  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Rate Constants ◽  
Picolinic Acid ◽  
Correlation Coefficients ◽  
Aprotic Solvents ◽  
Pyridine Carboxylic ◽  
Similar Range

The rate constants for the reaction of three isomeric pyridine mono-carbocylic acid N-oxides with diazodiphenylmethane were determined at 30 ?C in thirty two protic and aprotic solvents by the well known UV spectrophotometric method. The rate constants are generally higher than for pyridine mono-carboxylic acids in a similar range of solvents, except for picolinic acid N-oxide, and also higher in protic than in aprotic solvents. The determined rate constants were correlated with solvent parameters using the Kamlet-Taft solvatochromic equation bymeans of multiple regression analysis. The sign of the equation coefficients were in agreement with the postulated reaction mechanism. The mode of the influences of the solvent is discussed on the basis of the correlation coefficients, taking into account the specific structures of the pyridine mono-carboxylic acid N-oxides.

Residual Herbicide Effect on Interseeded Annual Clover in Southern Forage Systems

2018 ◽  
Vol 32 (4) ◽  
pp. 454-460
Author(s):  
Jennifer J. Tucker ◽  
M. Kimberly Mullenix ◽  
Stephen F. Enloe ◽  
Pat L. Burch
Keyword(s):  
United States ◽  
Carboxylic Acid ◽  
Early Summer ◽  
Pyridine Carboxylic Acid ◽  
Crimson Clover ◽  
Herbicide Treatment ◽  
Weed Cover ◽  
Pyridine Carboxylic ◽  
Residual Herbicide ◽  
Acid Herbicides

AbstractAcross the southeastern United States, pyridine carboxylic acid herbicides are widely used for broadleaf weed control in permanent grass pastures. This family of herbicides has proved very successful for controlling most broadleaf weeds commonly present in southeastern pastures and hayfields. In the southern United States, producers have expressed concern when overseeding legume species into warm-season perennial sods following application of commonly used pyridine carboxylic acid herbicides, as legumes are generally highly sensitive to this herbicide family. Field experiments were established to evaluate two herbicide treatment programs (residual vs nonresidual) on crimson clover overseeded into bermudagrass sod. The residual herbicide program included aminopyralid plus 2,4-D (0.09 + 0.7 kg ae ha–1), and the nonresidual program included triclopyr plus fluroxypyr (0.63 + 0.21 kg ae ha–1) plus 2,4-D (1.12 kg ae ha–1). Herbicide programs were applied at two key timings: in spring (May) and early summer (June). Spring applications were also evaluated when used in single vs repeated annual application. Our results did not indicate soil residual herbicide issues for crimson clover planted in the fall following spring or early-summer application of aminopyralid + 2,4-D at either location. Additionally, there were no cumulative negative impacts on crimson clover following 2 yr of spring herbicide application. Crimson clover cover, however, strongly decreased as grass and weed cover increased––an event that may be related to greater interspecific competition at higher levels of grass and weed cover. Soil fertility, weather, and competition from resident annual grasses and weeds strongly influenced productivity, suggesting that changes in pasture dynamics had a greater influence on clover productivity than did herbicide treatment or timing of application.

scholarly journals Thermodynamic Properties of Three Pyridine Carboxylic Acid Methyl Ester Isomers

2007 ◽  
Vol 52 (2) ◽  
pp. 580-585 ◽  
Author(s):  
Maria D. M. C. Ribeiro da Silva ◽  
Vera L. S. Freitas ◽  
Luís M. N. B. F. Santos ◽  
Michal Fulem ◽  
M. J. Sottomayor ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Methyl Ester ◽  
Thermodynamic Properties ◽  
Acid Methyl Ester ◽  
Pyridine Carboxylic Acid ◽  
Acid Methyl ◽  
Pyridine Carboxylic

Studies in the pyridine carboxylic acid series

1969 ◽  
Vol 3 (9) ◽  
pp. 537-539 ◽  
Author(s):  
V. I. Trubnikov ◽  
V. V. Petrov ◽  
E. S. Zhdanovich ◽  
N. A. Preobrazhenskii
Keyword(s):  
Carboxylic Acid ◽  
Pyridine Carboxylic Acid ◽  
Pyridine Carboxylic

scholarly journals New Stable Manganese(III) Chelates of Some Pyridine Carboxylic Acids

1981 ◽  
Vol 36 (10) ◽  
pp. 1270-1272 ◽  
Author(s):  
Saktiprosad Ghosh ◽  
Pranab K. Ray ◽  
Tapas K. Bandyopadhyay ◽  
Amal K. Deb
Keyword(s):  
Carboxylic Acid ◽  
Dicarboxylic Acid ◽  
Carboxylic Acids ◽  
Tricarboxylic Acid ◽  
Pyridine Carboxylic ◽  
Physicochemical Methods

Abstract The syntheses of three new and unusually stable Mn(III) complexes of pyridine-2-carboxylic acid, pyridine-2,6-dicarboxylic acid and pyridine-2,4,6-tricarboxylic acid and their characterisation by various standard physicochemical methods is reported

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