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DOI: 10.1590/S0100-29452011000100035
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摘要: Citrus blight is a vascular abnormality that affects tree production. It still under debate if it has biotic or abiotic causes. Although been detected since 1979 affecting plants in orchards of the State Sao Paulo, its occurrence was not confirmed certain citrus producing areas Brazil. The objective present study to confirm by diagnostic tests area northwestern region state Parana. done at one experimental orchard with 'Valencia' sweet orange (Citrus sinensis L. Osb.) grafted on 'Rangpur' lime (C. limonia Osb.), planted 1994 and located Nova Esperanca county. zinc content trunk plant injection water presence blight. symptoms decline were characterized small, opaque less turgid leaves, reduction new sprout flushes, twig dieback, crop production smaller fruits. first observed seven years after planting time fifteen reached 31% all plants.