Determination of optimal timing of 2,4-dichlorophenoxyacetic acid foliar applications for common scab control in potato

2013 ◽  
Vol 163 (2) ◽  
pp. 242-256 ◽  
Author(s):  
H.K. Thompson ◽  
R.S. Tegg ◽  
N.W. Davies ◽  
J.J. Ross ◽  
C.R. Wilson
Keyword(s):  
Common Scab ◽  
Optimal Timing ◽  
Dichlorophenoxyacetic Acid ◽  
Scab Control ◽  
2,4 Dichlorophenoxyacetic Acid

scholarly journals Foliar Treatments of 2,4-Dichlorophenoxyacetic Acid for Control of Common Scab in Potato Have Beneficial Effects on Powdery Scab Control

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Hannah Katherine Thompson ◽  
Robert Stephen Tegg ◽  
Ross Corkrey ◽  
Calum Rae Wilson
Keyword(s):  
Common Scab ◽  
Field Trials ◽  
Powdery Scab ◽  
Dichlorophenoxyacetic Acid ◽  
Beneficial Effects ◽  
Pathogen Invasion ◽  
Potato Plants ◽  
Scab Control ◽  
Tuber Disease ◽  
2,4 Dichlorophenoxyacetic Acid

Prior studies have shown that applications of the synthetic auxin 2,4-dichlorophenoxyacetic acid (2,4-D) to the foliage of potato plants can reduce common scab. Here field and glasshouse trials suggest that 2,4-D foliar treatments may also reduce the biologically distinct tuber disease, powdery scab. Significant correlations between suppression of common and powdery scab from the field trials suggested an interaction between the two diseases or possible additional broad spectrum mechanisms of enhanced defence against pathogen invasion provided by 2,4-D treatment.

scholarly journals Electroanalytical Methodology for the Direct Determination of 2,4-Dichlorophenoxyacetic Acid in Soil Samples Using a Graphite-Polyurethane Electrode

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Fernanda Ramos de Andrade ◽  
Renata Alves de Toledo ◽  
Carlos Manoel Pedro Vaz
Keyword(s):  
Irreversible Process ◽  
Direct Determination ◽  
Parameters Optimization ◽  
Dichlorophenoxyacetic Acid ◽  
Reduction Peak ◽  
Undisturbed Soil ◽  
Polyurethane Composite ◽  
Experimental Parameters ◽  
2,4 Dichlorophenoxyacetic Acid

An electroanalytical methodology was developed for the direct determination of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) using a graphite-polyurethane composite electrode and square wave voltammetry (SWV). 2,4-D exhibited one reduction peak with characteristics of an irreversible process at −0.54 V (versus Ag/AgCl), which is controlled by the diffusion of the reagent on the electrode surface. After the experimental parameters optimization (pH 2.0,f=50 s−1,a=0.50 V, andΔEi=0.03 V), analytical curves were constructed in the range of 0.66 mg L−1to 2.62  mg L−1. Detection (LD) and quantification (LQ) limits were 17.6 μg L−1and 58.6 μg L−1, respectively. The methodology was successfully applied to measure the percolation of the herbicide 2,4-D in undisturbed soil columns of different granulometric compositions.

Amplifying Bienzyme Cycle-linked Immunoassays for Determination of 2,4-Dichlorophenoxyacetic Acid

1996 ◽  
Vol 799 (1 Enzyme Engine) ◽  
pp. 519-524 ◽  
Author(s):  
FRANK F. BIER ◽  
EVA EHRENTREICH-FÕRSTER ◽  
FRIEDER W. SCHELLER
Keyword(s):  
Dichlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

scholarly journals Optimization of the Conditions for Determining 2,4-D and Deltamethrin by HPLC

2020 ◽  
Vol 20 (4) ◽  
pp. 372-377
Author(s):  
Elena V. Melikhova ◽  
◽  
Olga V. Farafonova ◽  
Keyword(s):  
River Water ◽  
Chromatographic Determination ◽  
Capillary Columns ◽  
Dichlorophenoxyacetic Acid ◽  
Separate Determination ◽  
Isocratic Elution ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Gradient Mode

The paper presents the results of optimizing the conditions for the chromatographic determination of 2,4-dichlorophenoxyacetic acid and deltamethrin for two capillary columns (Supelcosil LC-18, Kromasil C-18). The modes of individual chromatography of pesticides were selected. The use of the isocratic elution mode in the joint presence of 2,4-dichlorophenoxyacetic acid and deltamethrin was shown and experimentally proved to be invalid. Three options were proposed for the conditions of the gradient mode of the separate detection of analytes in a mixture. The developed technique for the chromatographic separate determination of 2,4-D and deltamethrin with their joint presence was tested via analysis of river water and potato samples.

scholarly journals Characterization of Hapten-Protein Conjugates: Antibody Generation and Immunoassay Development for Chlorophenoxyacetic Acid Pesticides

2009 ◽  
Vol 92 (6) ◽  
pp. 1773-1779 ◽  
Author(s):  
Robin C Boro ◽  
K Vikas Singh ◽  
C Raman Suri
Keyword(s):  
Inhibitory Concentration ◽  
Dichlorophenoxyacetic Acid ◽  
Protein Conjugation ◽  
Protein Conjugates ◽  
Highly Sensitive ◽  
Ic50 Values ◽  
Chlorophenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid

Abstract The generation of specific and sensitive antibodies against small molecules is greatly dependent upon the characteristics of the hapten-protein conjugates. In this study, we report a new fluorescence-based method for the characterization of hapten-protein conjugates. The method is based on an effect promoted by hapten-protein conjugation density upon the fluorescence intensity of the intrinsic tryptophan chromophore molecules of the protein. The proposed methodology is applied to quantify the hapten-protein conjugation density for two different chlorophenoxyacetic acid pesticides, 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4-dichlorophenoxybutyric acid (2,4-DB), coupled to carrier protein. Highly sensitive anti-2,4-D and anti-2,4-DB antibodies were obtained using these well-characterized hapten-protein conjugates. The generated antibodies were used in an immunoassay format demonstrating inhibitory concentration (IC50) values equal to 30 and 7 ng/mL for 2,4-D and 2,4-DB, respectively. Linearity was observed in the concentration range between 0.1500 ng/mL with LODs around 4 and 3 ng/mL for 2,4-D and 2,4-DB, respectively, in standard water samples. The proposed method was successfully applied for the determination of the extent of hapten-protein conjugation to produce specific antibodies for immunoassay development against pesticides.

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