Response of pre-harvest drop of grapefruit on two rootstocks to 2,4-D, MCPA and gibberellic acid

1982 ◽  
Vol 22 (117) ◽  
pp. 337 ◽  
Author(s):  
RA Sarooshi
Keyword(s):  
Gibberellic Acid ◽  
Poncirus Trifoliata ◽  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
Rough Lemon ◽  
Fruit Drop ◽  
South Wales ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Better Than

Several formulations, concentrations and timings of sprays of 2,4-D (2,4-dichlorophenoxyacetic acid) and MCPA (4-chloro-2-methyl phenoxyacetic acid) were tested for their ability to reduce pre-harvest drop of late hanging Marsh grapefruit growing on rough lemon (Citrus jambheri) and trifoliata (Poncirus trifoliata) rootstocks at Dareton in south-western New South Wales. Gibberellic acid was also tested in several timing combinations with 2,4-D for its ability to improve the quality of late hanging fruit. On rough lemon the established standard treatment of 2,4-D at 20 ppm applied in mid-May was as good or better than all other treatments. On trifoliata this standard spray was again as effective as all others in preventing drop up to mid-November, but a similar spray applied in midJune was more effective from mid-November to mid-December. MCPA applied at 10 or 20 ppm in mid-May was not as effective as the standard spray. The best treatments reduced the average cumulative fruit drop, of 39% on trifoliata and 70% on rough lemon, by at least a half. When gibberellic acid at 10 ppm was added to the standard mid-May spray of 2,4-D, or when it followed it in mid June, it improved the colour and appearance and reduced the rind thickness and puffiness of late hanging fruit.

Effect of timing, concentration and stock/scion combination on chemical control of pre-harvest drop of Navel oranges

1975 ◽  
Vol 15 (74) ◽  
pp. 429 ◽  
Author(s):  
RA Sarooshi ◽  
MC Stannard
Keyword(s):  
Poncirus Trifoliata ◽  
Ethyl Esters ◽  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
Fruit Drop ◽  
Washington Navel ◽  
Semi Arid Region ◽  
D 20 ◽  
One Year ◽  
2,4 Dichlorophenoxyacetic Acid

The effects of 4-chloro-2-methyl phenoxyacetic acid (MCPA) and some derivatives of 2,4-dichlorophenoxyacetic acid (2,4-D) applied at various concentrations and application times on preharvest drop from several navel orange clones and rootstocks were investigated. The trees were spray irrigated, on light soils and growing in a semi-arid region. Herps Washington navel strain on Poncirus trifoliata rootstock had a small natural drop and fruit drop from this combination was unaffected by spray treatments. Control trees of Leng navels dropped more fruit than those of GVN or Herps Washington navel strains. There were no differences in fruit drop between MCPA and 2,4-D both applied at 20 p.p.m. in mid May. In one year however, the higher concentration of 2,4-D was superior to MCPA applied at 10 p.p.m. in mid May but was not better than 2,4-D at 10 p.p.m. Two sprays of 2,4-D 10 p.p.m. applied one each in mid May and mid June had no advantage over a single spray of 2,4-D 20 p.p.m. mid May. The four forms of 2,4-D used were the sodium and amine salts (low volatile) and the isopropyl and ethyl esters (high volatile). All the forms sprayed in mid May at 20 p.p.m. proved equally effective. In all cases, fruit quality and yield were unaffected by spray treatments over a number of years.

Effects of growth regulators and controlled atmosphere on stored carrots

1974 ◽  
Vol 82 (2) ◽  
pp. 245-249 ◽  
Author(s):  
M. Abdel-Rahman ◽  
F. M. R. Isenberg
Keyword(s):  
Gibberellic Acid ◽  
Growth Regulators ◽  
Dichlorophenoxyacetic Acid ◽  
Trimethylammonium Chloride ◽  
Controlled Atmosphere ◽  
Benzyl Adenine ◽  
Large Size ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Better Than

SummaryPreharvest sprays with 6-hydroxy-3-(2H)-pyridazinone (MH), or immersion in solutions of MH, 2,4-dichlorophenoxyacetic acid (2,4-D), 2-chloroethylphosphonic acid (ethephon), coumarin or (2-chloroethyl) trimethylammonium chloride (CCC) inhibited both sprouting and rooting of treated carrots during storage at 0 °C whencompared with water-dipped or untreated carrots, while N-6-benzyl-adenine (BA) dips stimulated extensive rooting and sprouting. In contrast, immersion in gibberellic acid (GA3) solutions had very little effect.Storage atmospheres containing 1, 2.5, 5 or 10% oxygen inhibited both sprouting and rooting but increased mould infection. Atmospheres containing 21% (air) or 40% oxygen reduced mould infection, but increased sprouting and rooting of stored carrots. Washing carrots in water before storage did not significantly affect mould infection, while washing in 0.5% clorox increased it. However, washing in water followed by immersion in MH inhibited both sprouting and rooting and also reduced mould infection. ‘Jumbo’ and large-size carrots stored better than medium and small carrots.

scholarly journals Gibberellic Acid, Fruit Freezing, and Post-freeze Quality of `Hamlin' Oranges

2006 ◽  
Vol 16 (2) ◽  
pp. 301-305 ◽  
Author(s):  
Frederick S. Davies ◽  
Glenn Zalman
Keyword(s):  
Gibberellic Acid ◽  
Cold Hardiness ◽  
Poncirus Trifoliata ◽  
Soluble Solids ◽  
Titratable Acid ◽  
Fruit Drop ◽  
Solids Content ◽  
Orange Trees ◽  
Juice Content

Our objectives were to determine if gibberellic acid (GA3) application at color break in the fall affected the juice content, soluble solids content (SSC), titratable acid (TA), and ratio of SSC: TA of `Hamlin' orange (Citrus sinensis) fruit following moderate to severe freezes. We also wanted to know if GA3 affected the post-freeze rate of decrease in juice content, fruit and tree cold hardiness, and the amount of fruit drop following a freeze. GA3 (18 floz/acre) was applied at color break in the fall of 2002, 2003, and 2004 to `Hamlin' orange trees on Swingle citrumelo (C. sinensis × Poncirus trifoliata) rootstock planted in 1995 at Gainesville, Fla. Moderate to severe freezes occurred in all three seasons. Fruit were harvested at about 2-week intervals following freezes in each season and the internal fruit quality was determined. GA3-treated fruit generally had higher juice content compared with nontreated fruit for 8 weeks after moderate to severe freezes in all three seasons, which may be economically important to citrus processors and growers since Florida growers are paid based on fruit pounds-solids (juice content × SSC). The rate of decrease in juice content over time was similar for both treatments in seasons one and two, but was less for GA3-treated fruit than nontreated fruit in season three. In addition, SSC was equal to or slightly greater for fruit treated with GA3 than for nontreated fruit. Fruit drop rate and magnitude were also significantly less for the GA-treated compared with nontreated trees in two of three seasons. GA3 did not affect fruit, leaf, or tree cold hardiness in any season.

Initiation and morphological development of somatic embryoids from barley cell cultures

1984 ◽  
Vol 62 (6) ◽  
pp. 1245-1249 ◽  
Author(s):  
L. S. Kott ◽  
K. J. Kasha
Keyword(s):  
Somatic Embryogenesis ◽  
Abscisic Acid ◽  
Gibberellic Acid ◽  
Cell Cultures ◽  
Dichlorophenoxyacetic Acid ◽  
Morphological Development ◽  
Low Concentrations ◽  
The Media ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Barley Cell

Somatic embryogenesis was induced in callus previously initiated from immature embryos of barley. These cultures ranged in age from 6 weeks to 30 months. Embryoids were readily initiated from homogenized suspension-grown aggregates when plated on modified B5 media with 2,4-dichlorophenoxyacetic acid. Low concentrations (0.1 and 0.05 mg∙L−1) of abscisic acid promoted further maturation of embryoids, while gibberellic acid (1 mg∙L−1) and kinetin (0.1 mg∙L−1) were used in the media to encourage embryoid germination. The development of somatic embryoids from initiation through maturation and germination is described.

scholarly journals Heterogeneous Fenton-Like Catalytic Degradation of 2,4-Dichlorophenoxyacetic Acid by Nano-Scale Zero-Valent Iron Assembled on Magnetite Nanoparticles

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2909 ◽  
Author(s):  
Xiaofan Lv ◽  
Yiyang Ma ◽  
Yangyang Li ◽  
Qi Yang
Keyword(s):  
Hydrogen Peroxide ◽  
Synergistic Effects ◽  
Degradation Process ◽  
Zero Valent Iron ◽  
Dichlorophenoxyacetic Acid ◽  
Heterogeneous Fenton ◽  
Reaction Conditions ◽  
Nano Zero Valent Iron ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Better Than

Fe0@Fe3O4 nanoparticles with dispersibility and stability better than single nano zero-valent iron (nZVI) were synthesized and combined with hydrogen peroxide to constitute a heterogeneous Fenton-like system, which was creatively applied in the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The effects of different reaction conditions like pH, hydrogen peroxide concentration, temperature, and catalyst dosage on the removal of 2,4-D were evaluated. The target pollutant was completely removed in 90min; nearly 66% of them could be mineralized, and the main intermediate product was 2,4-dichlorophenol. Synergistic effects between nZVI and Fe3O4 made the 2,4-D degradation efficiency in the Fe0@Fe3O4/H2O2 system greater than in either of them alone. More than a supporter, Fe3O4 could facilitate the degradation process by releasing ferrous and ferric ions from the inner structure. The reduction of 2,4-D was mainly attributed to hydroxyl radicals including surface-bound ∙OH and free ∙OH in solution and was dominated by the former. The possible mechanism of this Fe0@Fe3O4 activated Fenton-like system was proposed.

Adsorption of 2,4-Dichlorophenoxyacetic Acid and Phenoxyacetic Acid on Sibunit

2018 ◽  
Vol 52 (1) ◽  
pp. 53-57 ◽  
Author(s):  
M. D. Vedenyapina ◽  
L. R. Sharifullina ◽  
S. A. Kulaishin ◽  
E. D. Strel’tsova ◽  
A. A. Vedenyapin ◽  
...  
Keyword(s):  
Dichlorophenoxyacetic Acid ◽  
Phenoxyacetic Acid ◽  
2,4 Dichlorophenoxyacetic Acid
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