Tinangaja is a widespread lethal disease of putative viroid etiology affecting coconut palm on the island of Guam caused by coconut tinangaja viroid (CTiVd). Symptom is a progressive thinning of the crown, caused by a reduction in the number of fronds. The size and number of fruit are also reduced, with the fruit becoming rounded in alate varieties. A fine stippling of the leaves can also be seen; minute chlorotic spots appear on leaf lamina. As the disease progresses, fruit become deformed and shrivelled. Infected trees then cease to produce nuts, but may continue to produce inflorescences, which become increasingly smaller, may have necrotic tips and fail to set fruit. This disease resembles coconut cadang-cadang disease, caused by a coconut cadang-cadang viroid (CCCVd), which occurs in the Philippines. The two viroids share about 65% overall sequence homology.
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