Abstract
Abstract Since 1974 about 30,000 ha of Eucalyptus plantations located in the Rio Doce Valley in the State of Minas Gerais, Brazil have been affected by the ‘Mal do Rio Docs’, a disease of unknown etiology. Studies have eliminated root infection as a possible cause and currently air pollution and unfavourable water and soil conditions are considered as more likely causes, although no definite conclusions have been reached. Field tests in a highly affected area revealed that some provenances of Eucalyptus urophylla, E. maculata, E. grandis, E. cloeziana, E. microcorys and E. citriodora had more than 25% of diseased plants. However, certain provenances of E. saligna, E. pellita, E. camaldulensis, E. resinifera, E. punctata and a clone of E. grandis contained less than 10% of diseased plants and these showed only mild disease symptoms. The results suggest that field selection of tolerant species, provenances or clones may lead to control of the disease.
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