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Sete grupos de híbridos entre porta-enxertos elite de citros (Citrus sp.) e seus genitores foram estudados quanto a reação à infecção de tronco por Phytophthora parasitica, em plantas adultas no campo. Inocularam-se artificialmente, em duas posições do tronco, 132 plantas nucelares dos genitores e 486 híbridos entre limão (Citrus limonia) Cravo 'Limeira' (C), Poncirus trifoliata 'Davis A' (T), tangerina (C.sunki) 'Sunki' (S) e laranja Azeda (C. aurantium) 'São Paulo' (A). A classificação do grau de resistência à gomose de tronco em plantas adultas no campo foi possível somente quando baseada na média do tamanho de lesões de mais de 30 plantas nucelares, devido às grandes variações observadas em plantas individuais do mesmo clone, impossibilitando a seleção precoce de híbridos baseada em valores de plantas individuais. O trifoliata e a laranja Azeda mostraram-se bastante resistentes, desenvolvendo, em geral, lesões de tamanho reduzido. A tangerina Sunki e o limão Cravo desenvolveram lesões maiores, embora a tangerina Sunki tenha mostrado uma tendência em desenvolver lesões maiores que às do limão Cravo. Híbridos de trifoliata apresentaram, no geral, lesões intermediárias. Os híbridos de Azeda apresentaram lesões de tamanhos bastante variáveis, porém a maioria, com lesões grandes. Da mesma forma comportaram-se os híbridos recíprocos entre Sunki e Cravo. Seven groups of elite citrus (Citrus sp.) rootstock hybrids and their genitors were field tested for gummosis caused by Phytophthora parasitica. Two trunk inoculations were made in 132 nucellar clones of the genitors and in 486 hybrids between 'Limeira' rangpur lime (Citrus limonia) (C), 'Davis A' trifoliate orange (Poncirus trifoliata) (T), 'Sunki' mandarin (C. sunki) (S) and 'São Paulo' sour orange (C. aurantium) (A). The degree of resistance to gummosis could be estimated from inoculation of adult plants in the field only when it was based on the mean lesions of more than 30 nucellar plants. This was due to the great variations observed in single individuals of the same clone although the conditions were well controlled. For this reason, it was not possible to make an early selection of hybrids based on the mean lesion area developed in single individuals. Trifoliate and sour oranges were quite resistant, displaying small-size lesions. Sunki mandarin and rangpur lime developed larger lesions, although Sunki mandarin tended to develop larger lesions than rangpur lime. In general, trifoliate hybrids showed lesions of intermediate size. Sour orange hybrids developed lesions that were quite variable in size although most of them were large. This same behaviour was observed among reciprocal SxC hybrids

Resistência de clones e híbridos de porta-enxertos de citros à gomose de tronco causada por Phytophthora parasitica