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Additional index words. Lasmenia, Pestalotiopsis, Phomopsis, Colletotrichum, Abound, Trilogy Abstract. Rambutan (Nephelium lappaceum Linn.) is a tropical fruit in Hawaii that has increased in value in the niche market of exotic fruits. The primary limitation to preharvest and postharvest quality is the occurrence of fungal diseases of the fruit. A survey of rambutan disease was conducted at orchards 9.7 km south and 29.0 km north of Hilo, HI, to determine the main fungal pathogens affecting preharvest fruit quality. Pericarp of rambutanfruit revealed brownto blacklesions that progressed toblackening and drying of the fruit with some fruits becoming totally mummified. Four fungi consistently isolated from symptomatic fruit included Lasmenia, Pestalotiopsis, Phomop- sis, and Colletotrichum spp. Over the 2-year sampling period, disease incidence from more than 300 fruits sampled was 84.6%. Nine rambutan cultivars were evaluated for disease incidence under field conditions. Disease incidence was greater than 90% for 'Sitangku' and 'R167' but less than 60% for 'Chompoo'. Twelve fungal isolates from infected fruit were selected for further characterization (six Lasmenia isolates and two isolates each of Pestalotiopsis, Phomopsis, and Colletotrichum). Morphology, colony characteristics, and pathogenicity of the isolates were examined. The optimum growth temperatureforallfungalisolatesrangedbetween22and28 8C.Molecularmethodswere used to confirm the identity of the fungi. The fungal isolates were evaluated for in vitro baseline sensitivities for mycelial growth for fungicides registered for use in Hawaii (Abound and Trilogy). Abound was more effective at inhibiting fungal growth than was Trilogy; however, efficacy appeared to be influenced by fungal genera. Inhibition of fungal growth by Abound ranged from a 76% reduction for Lasmenia to a 23% reduction for Phomopsis isolates.

Field Survey and Fungicide Screening of Fungal Pathogens of Rambutan (Nephelium lappaceum) Fruit Rot in Hawaii