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M. Agustí, V. Almela, M. Aznar, M. El-Otmani and J. Pons

The butylglycol ester of 2,4-DP increased final fruit size in `Owari Satsuma' mandarin (Citrus unshiu Marc.). The response magnitude depended on the concentration applied and treatment date. When applied at the end of physiological drop, 50 mg·liter-1 was the most effective treatment for increasing fruit size. Peel density and firmness also were improved. Because no fruit thinning occurred, this auxin seemed to stimulate fruit growth. Chemical name used: 2,4-dichlorophenoxypropionic acid (2,4-DP).

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Amílcar M.M. Duarte, Amparo García-Luis, Rosa Victoria Molina, Consuelo Monerri, Vicente Navarro, Sergio G. Nebauer, Manuel Sánchez-Perales and Jose Luis Guardiola

A winter gibberellic acid (GA3) spray consistently reduced flower formation, but had a variable effect on the amount of first-grade fruit in the early harvest of `Clausellina' satsuma (Citrus unshiu Marc.), and in the long term these applications had no significant effect on the value of the crop. Auxin applications increased the amount of first grade-early harvested fruit, and increased crop value as compared to hand-thinned trees. No significant differences in yield or fruit grade could be found among the different auxin applications tried, namely an application of 20 mg·L-1 2,4-dichlorophenoxyacetic acid (2,4-D) at flowering, or applications of 25 mg·L-1 naphthaleneacetic acid (NAA), or 50 mg·L-1 2,4-dicholorophenoxypropionic acid (2,4-DP) at the end of fruitlet abscission. Apart from their effect on size, the auxin applications had only a marginal effect on fruit quality.

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Fatih Ali Canli, Murat Sahin, Nurettin Temurtas and Mustafa Pektas

25 mg·L −1 2,4-dichlorophenoxypropionic acid (2,4-DP) during pit hardening also improved fruit size and advanced fruit maturation in apricot ( Agusti et al., 1994 ). After harvest, softening of the apricot fruit adversely affects its marketability

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Catarina P. Carvalho, Alejandra Salvador, Pilar Navarro, Adela Monterde and Jose M. Martínez-Jávega

1994 Agustí, M. Juan, M. Martinez-Fuentes, A. Mesejo, C. Reig, C. Almela, V. 2006 Application of 2,4-dichlorophenoxypropionic acid 2-ethylhexyl ester reduces mature fruit abscission in

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Satoru Kondo, Hiroko Yamada and Sutthiwal Setha

be indicative of interactions between jasmonates and ethylene or ACC synthase. Our previous report showed that the application of the synthetic auxin 2, 4-dichlorophenoxypropionic acid (2, 4-DP) increased ethylene production and the ripening