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Germination of urediniospores, appressorium formation and penetration by Puccinia psidii Winter were studied on detached leaves of resistant and susceptible clones of Eucalyptus grandis Hill ex Maiden. More than 90% of germination and appressorium formation were observed 12 and 18 h, respectively, after inoculation for both genotypes. Direct penetration by P. psidii between the anticlinal walls of...