Response ofEucalyptusSpecies to Field Infection byPuccinia psidii

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Abstract
Thirteen spp. of Eucalyptus with a total of 23 provenances (prs) were tested for resistance to Puccinia psidii in a field experiment with 4 replicates of 25 plants [in Belo Oriente, Brazil]. Provenances were rated according to a scale based on the percentage of plants infected and the number of rust pustules. E. grandis pr South Africa was highly susceptible; E. grandis prs Coff''s Harbour, Kiogle Tablelands and Garca, E. cloeziana prs Carbonita and Transvaal, E. citriodora pr Florasa and E. saligna pr Cesanook were susceptible; E. urophylla pr Australia 9003, E. camaldulensis prs Gibb River and Petford, E. tereticornis pr S. Helenvale, E. pirocarpa pr Woolgoolga, E. paniculata pr Florasa, E. punctata pr Manduri, E. maculata pr Bom Despacho and E. saligna pr Mt. Scanzi were moderately susceptible; E. pellita pr N. Australia 10966, E. microcorys pr Fabriciano and E. urophylla pr Australia 10136 were resistant; and E. pellita prs Helenvale, Mt. Pandanus and NE Coen were highly resistant. Rust did not affect height growth of 2 susceptible and 4 moderately susceptible provenances, but did suppress growth of 3 other susceptible provenances. Except for E. grandis pr South Africa, all provenances were free of rust 1 yr after exposure to inoculum.

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