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The effect of foliar sprays of the synthetic auxin 3-5-6 TPA, on fruit drop, fruit size and seed development in three lychee (Litchi chinensis) cultivars: Tai So, Fay Zee Sui and Kwai Mai Pink.

Drinnan, J. and Diczbalis, Y. (2010) The effect of foliar sprays of the synthetic auxin 3-5-6 TPA, on fruit drop, fruit size and seed development in three lychee (Litchi chinensis) cultivars: Tai So, Fay Zee Sui and Kwai Mai Pink. In: ISHS Acta Horticulturae 863: III International Symposium on Longan, Lychee, and other Fruit Trees in Sapindaceae Family, 25-28 August 2008, Fuzhou, Fujian, China.

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Publisher URL: http://www.actahort.org
Organisation URL: http://www.actahort.org/books/863/863_44.htm

Abstract

Fruit drop in lychee can cause major yield losses in Australia, the severity varying with cultivar and season. Research in China, South Africa and Israel has demonstrated the potential for synthetic auxins used as foliar sprays to reduce fruit drop in lychee. Trials were initiated in Australia to test the efficacy of the synthetic auxin, 3-5-6 Trichloro-2-phridyl-oxyacetic acid (3-5-6 TPA) at 50 ppm on the cultivars Tai So, Fay Zee Sui and Kwai Mai Pink. Results indicate that in most cases the TPA reduced natural fruit drop however the size of the fruit at the time of application affects the response and the ideal application time varies with cultivar; approximately 13 mm fruit length in 'Kwai Mai Pink', 20 mm in 'Fay Zee Sui' and 27 mm in 'Tai So'. If applied too early in 'Tai So', it caused an increase in fruit drop. The TPA was most effective when natural fruit drop was high, reducing fruit drop from 74.7 to 34.9% in 'Kwai Mai Pink' and least effective when natural fruit drop was low. An increase in the percentage of fruit with poorly developed (chicken tongue) seed and slightly larger fruit size was also observed in treated trees.

Item Type:Conference or Workshop Item (Paper)
Additional Information:© International Society for Horticultural Science (ISHS).
Keywords:Auxins; cultivars; foliar spraying; fruit drop; plant growth; regulators; seeds; cultivated varieties; plant growth substances; plant hormones.
Subjects:Plant culture > Growth regulators
Plant culture > Fruit and fruit culture > Culture of individual fruits or types of fruit
Deposited On:16 Dec 2010 07:16
Last Modified:16 Mar 2011 00:40

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