Organ Loss and Yield Impacts of ‘Valencia’ Sweet Orange in Response to Fruit Abscission Agents

  title={Organ Loss and Yield Impacts of ‘Valencia’ Sweet Orange in Response to Fruit Abscission Agents},
  author={Luis Pozo and Jacqueline K. Burns},
To successfully use abscission agents for 'Valencia' sweet orange mechanical harvesting throughout the harvest season, unwanted flower, fruitlet, and leaf drop must be assessed and minimized. Ethephon (400 mgL -1 ), 1-methylcyclopropene (1-MCP; 5m M), ethephon + 1-MCP, 5-chloro-3-methyl-4-nitro-1H-pyrazole (CMNP; 200 mgL -1 ), and a kinetic adjuvant control (0.15% (v/v)) were applied to 'Valencia' branches at various times from full bloom in Mar. 2006 to the end of full bloom in Mar. 2008… 

Figures from this paper

IFAS Citrus Initiative Annual Research and Extension Progress Report 2006-07 Mechanical Harvesting and Abscission

Detailed Accomplishments in 2008-09: Processors are concerned about peel integrity of CMNP-treated fruit. We conducted 2 trials in March and April with Valencia oranges to determine the postharvest

Effect of harvesting with a trunk shaker and an abscission chemical on fruit detachment and defoliation of citrus grown under Mediterranean conditions.

It is demonstrated that mechanical harvesting with trunk shakers may be a feasible solution for citrus cultivated in Spain for fresh market.

Gene expression in Citrus sinensis fruit tissues harvested from huanglongbing-infected trees: comparison with girdled fruit

Mechanisms regulating development of HLB symptoms may lie in the host disease response rather than being a direct consequence of carbohydrate starvation.

Anatomical and histological changes in the fruit abscission zone of water dropwort (Oenanthe stolonifera DC.)

  • J. EoB. Lee
  • Biology
    Horticulture, Environment, and Biotechnology
  • 2011
In explants treated with cycloheximide, the cell wall separated from the membrane and a whorled membrane was observed, suggesting that structural changes in the cell membrane may help explain the control of fruit abscission in O. stolonifera.

Improvement in Handpicking Efficiency of Satsuma Mandarin Fruit with Combination Treatments of Gibberellin, Prohydrojasmon and Ethephon

The results indicated that the treatment of 5 mg·L−1 GA plus 50 mg· L−1 PDJ in late September combined with ET from late October to early November was suitable for increasing SRH without impairing fruit quality and causing serious leaf abscission.

Allometric Models for Estimating Carbon Fixation in Citrus Trees

An evaluation of the C fixation in natural systems would be useful for the research community worldwide, especially in the context of the Kyoto Protocol.



Mechanical Harvesting Capacity in Sweet Orange Is Increased with an Abscission Agent

It is demonstrated that CMNP application increases harvesting capacity of trunk and canopy shakers by reducing time necessary to harvest each tree while maintaining high percent mature fruit removal.

Recovery from Phytotoxicity after Foliar Application of Fruit-loosening Abscission Compounds to Citrus

ADDITIONAL INDEX WORDS. 5-chloro-3-methyl-4-nitro-1H-pyrazole, chlorophyll fluorescence, Citrus sinensis, ethephon, photosynthesis, sweet orange, water potential ABSTRACT. The use of abscission

Citrus Fruit Abscission Induced by Methyl-jasmonate

ADDITIONAL INDEX WORDS. Citrus sinensis, 'Hamlin' orange, 'Valencia' orange, mechanical harvest, ethylene ABSTRACT. Methyl jasmonate (MJ) was tested as a potential abscission chemical to enhance

Differential Effects of 1-Methylcyclopropene on Citrus Leaf and Mature Fruit Abscission

ADDITIONAL INDEX WORDS. 5-chloro-3-methyl-4-nitro-1H-pyrazole, Citrus sinensis, coronatine, ethephon, fruit detachment force, methyl jasmonate ABSTRACT. 1-MCP is a gaseous ethylene binding inhibitor

Late-season `Valencia' Orange Mechanical Harvesting with an Abscission Agent and Low-frequency Harvesting

An abscission agent (5-chloro-3-methyl-4-nitro-1H-pyrazole [CMNP]) at 300 mg·L -1 in a volume of 2810 L·ha -1 was applied to Valencia orange trees [Citrus sinensis (L.) Osb.] on 22 May 2004. At this

Temperature Factor Affecting the Abscission Response of Mature Fruit and Leaves to CMN-Pyrazole and Ethephon in `Hamlin' Oranges

The effect of temperature on the ability of 5-chloro-3-methyl-4-nitro-1H-pyrazole (CMNP) and ethephon to induce ethylene evolution and abscission of mature fruit and leaves was determined using

Chemical Promotion of Fruit Abscission in Cherries and Plums with Special Reference to 2-chloroethylphosphonic Acid1

Fruit removal force (FRF) of sour cherry, Prunus cerasus L. ‘Montmorency’, was markedly reduced by foliar sprays of 2-chloroethylphosphonic acid (CEPA) applied 3-15 days prior to harvest. The

Hormonal regulation of fruitlet abscission induced by carbohydrate shortage in citrus

ABA and ACC are identified as components of the self-regulatory mechanism that adjusts fruit load to carbon supply, and offers a physiological basis for the photoassimilate competition-induced abscission occurring under natural conditions.

Factors influencing the effectiveness of ethephon As a citrus fruit abscission agent

[Citrus sinensis (L.) Osb.] orange trees in five separate exper iments and in two experiments using 'Robinson' ('Clementine' x 'Orlando', C. reticulata Blanco) and 'Sunburst' ['Robinson' x 'Osceola',

Citrus abscission and Arabidopsis plant decline in response to 5‐chloro‐3‐methyl‐4‐nitro‐1H‐pyrazole are mediated by lipid signalling

A link between lipid signalling, abscission in citrus and herbicidal damage in Arabidopsis is indicated and reduction in ATP content preceded the increase in PLA2 and LOX activities, LPO content and the biological response.