Variation in Phytophthora palmivora isolated from cacao and rubber
Isolates of Phytophthora palmivora from Theobroma cacao and Hevea brasiliensis, when grown separately on various media, differed in appearance, rate and manner of growth, amount of sporulation, and spore size. It was not possible to induce successful mating in Costa Rica between local isolates from cacao and rubber, or in Ceylon among 4 isolates from cacao (2 from Ceylon and 1 each from Costa Rica and Ghana) and 3 isolates from rubber (1 each from Costa Rica and Ceylon and P. heveae from Malaya). Disease symptoms were striking only when cacao pods and seedlings were inoculated with P. palmivora from cacao and rubber fruits, and seedlings were inoculated with isolates from rubber. Because of morphological, physiological, and specific pathogenic differences of P. palmivora isolated from cacao and rubber, it is proposed that the species described by Coleman (2) and by Thompson (18) be transferred to varietal status under P. palmivora Butl. as, respectively, P. palmivora Butl. var. theobromae (Colem.) comb. nov. (basionym: P. theobromae Colem.); and P. palmivora Butl. var. heveae (Thomps.) comb. nov. (basionym: P. heveae Thomps.).
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| Format: | biblioteca |
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Abr
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| Subjects: | THEOBROMA CACAO, HEVEA BRASILIENSIS, PLANTULAS, PHYTOPHTHORA PALMIVORA, AISLAMIENTOS, TIPOS COMPATIBLES, ESPORULACION, SINTOMAS, INOCULACION, PODER PATOGENO, TASA DE CRECIMIENTO, COSTA RICA, GHANA, SRI LANKA, |
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| Summary: | Isolates of Phytophthora palmivora from Theobroma cacao and Hevea brasiliensis, when grown separately on various media, differed in appearance, rate and manner of growth, amount of sporulation, and spore size. It was not possible to induce successful mating in Costa Rica between local isolates from cacao and rubber, or in Ceylon among 4 isolates from cacao (2 from Ceylon and 1 each from Costa Rica and Ghana) and 3 isolates from rubber (1 each from Costa Rica and Ceylon and P. heveae from Malaya). Disease symptoms were striking only when cacao pods and seedlings were inoculated with P. palmivora from cacao and rubber fruits, and seedlings were inoculated with isolates from rubber. Because of morphological, physiological, and specific pathogenic differences of P. palmivora isolated from cacao and rubber, it is proposed that the species described by Coleman (2) and by Thompson (18) be transferred to varietal status under P. palmivora Butl. as, respectively, P. palmivora Butl. var. theobromae (Colem.) comb. nov. (basionym: P. theobromae Colem.); and P. palmivora Butl. var. heveae (Thomps.) comb. nov. (basionym: P. heveae Thomps.). |
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