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Rambutan Phenology in Hawai’i: Flowering and Fruit Set Overview

Learn about rambutan phenology in Hawai’i including flowering, fruit set, and comparisons with Chanthaburi, Thailand, and Cairns, Australia. Discover key factors affecting flushes, fruition, and BRIX readings. Explore detailed timelines for anthesis and fruiting stages.

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Rambutan Phenology in Hawai’i: Flowering and Fruit Set Overview

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  1. Overview of Rambutan Phenology, Flowering, and Fruit Set in Hawai’i A.M. Kawabata M.A. Nagao D.F. Aoki K.Y. Hara L.K. Pena

  2. Chanthaburi, Thailand Monsoon season Hurricane season

  3. Chanthaburi Rainfall Monsoon season Hurricane season

  4. Cairns, Australia -one season Cycl- Hurricane season

  5. Cairns Rainfall -one season Cycl- Hurricane season

  6. Comparisons

  7. Flowering in Hawai’i • Response to water stress • Symptom = Leaf curling • Main season (July to August) • Minor season (April to May) • Anthesis takes 2-3 months, up to 9 months • Anthesis of a panicle takes 3-7 weeks, up to 23 weeks

  8. Rambutan Flowers Female Male InducedMale 21-52 days 24-46 days 12-15 days

  9. Silengkeng n=22 Naturally produced hermaphroditic male flowers R134 n=17

  10. Flushing in Hawai’i • Response to rainfall, heavy irrigation, pruning, harvest • Reduced by cool weather, heavy fruit set and flowering even in presence of rainfall • Non-synchronous • Takes 3-4 months to mature • Flushes must be mature at time of floral induction • Main seasons (May-Jun.; Aug.-Sept.)

  11. Fruiting in Hawai’i • Seed filling 8-10 weeks after anthesis • Aril/flesh development 10-12 weeks after anthesis • Harvest 16-20 weeks after anthesis • BRIX readings >18% • Main season (December-January) • Minor season (August to September) • Extended drought prolongs harvest 3-6 months longer

  12. BRIX

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