Vol. 72 No: 4

Title:
Effect of 3,5,6-Trichloro-2-Pyridyl-Oxyacetic Acid on Fruitlet Abscission and Yield of ‘Mauritius’ Litchi (Litchi Chinensis Sonn.)

Authors:
R.A. STERN and S. GAZIT

pp: 659-996

Abstract:
‘Mauritius’, the main cultivar in Israel's litchi industry, tends to suffer from massive fruitlet drop. Recently, spraying ‘Mauritius’ trees with 2,4,5-TP at the ca. 2 g fruitlet stage was shown to improve greatly productivity due to a reduction in fruitlet drop. Here we examine another synthetic auxin, 3,5,6-trichloro-2-pyridyl-oxyacetic acid (3,5,6-TPA), used in the commercial product Maxim^®. We found it to be as effective as 2,4,5-TP in reducing ‘'Mauritius’ fruitlet drop. In seven commercial-scale trials, spraying with 25 or 50 ppm 3,5,6-TPA consistently and significantly increased ‘Mauritius’ yields relative to non-sprayed controls. Therefore 3,5,6-TPA is recommended for routine use in ‘Mauritius’ orchards.

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