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Etiological study of breadfruit diseases in Hawaiʻi

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Item Summary

Title: Etiological study of breadfruit diseases in Hawaiʻi
Authors: Redfern, Takena
Keywords: breadfruit
Artocarpus altilis
tropical plant pathology
Issue Date: Dec 2010
Publisher: [Honolulu] : [University of Hawaii at Manoa], [December 2010]
Abstract: Diseases of breadfruit (Artocarpus altilis) in Hawaii have been observed but remained undiagnosed. Only two obligate pathogens were confirmed on leaf causing leaf rust and algal leaf spot. This study aimed to carry out etiological study of breadfruit diseases, with particular emphasis on one important disease, Phytophthora. Diseased samples were received from three breadfruit collections in Maui, Kauai and the Big Island. Associated potential pathogens were isolated, purified, and identified morphologically. Evaluation of breadfruit fields was also made on Maui to evaluate disease symptoms during a major epidemic in the breadfruit collection. Results from laboratory and field diagnosis found seven potential pathogens associated with leaf disease, five with fruit, three with twig and one with trunk. Phytophthora fruit rot, Fusarium twig rot, and Phoma leaf spot, were the most prevalent diseases. Four fruit potential pathogens, Phytophthora palmivora, P. tropicalis, Fusarium and Geotrichum were tested for their pathogenicity on fruit. Both P. palmivora and P. tropicalis were pathogenic whereas Fusarium and Geotrichum were not pathogenic. On seedlings of breadfruit, breadnut, cacao and papaya, P. palmivora and P. tropicalis were also pathogenic. Virulence, however, on fruits and seedlings was varied between the two species and among isolates of P. palmivora and P. tropicalis. Phytophthora palmivora was more virulent than P. tropicalis on breadfruit, breadnut, and papaya whereas P. tropicalis was more virulent on cacao. Phytophthora palmivora isolate T13 and T17, were highly virulent on fruits and isolates T5, T9, and T17 on breadfruit seedlings. Isolate T13 was identified as highly virulent both on fruit and seedling of breadfruit. Some evidences of isolate by breadfruit variety interaction were noted but the numbers of fruits and plants for each variety needs to be increased.
Description: M.S. University of Hawaii at Manoa 2010.
Includes bibliographical references.
Appears in Collections:M.S. - Tropical Plant Pathology

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