Abstract The influence of the grafting height (5, 10, 20 and 30 cm above the root collar) of P. edulis on P. gibertii was evaluated on the incidence of Fusarium wilt and horticultural performance. Plants of P. gibertii grafted on P. edulis and non-grafted plants of both species were also studied. In addition, histopathological studies were also performed on the roots of non-grafted P. edulis collected at three severity stages of Fusarium wilt. In greenhouse, the graft take was inversely related to the grafting height in general. In the field conditions, the plant growth of P. gibertii grafted on P. edulis was superior to its reciprocal grafting, even though the former combination was susceptible to Fop. Plants of P. edulis grafted on P. gibertii at all grafting heights did not present symptoms of Fop, and the number of fruit yield and quality were equivalent, but plant growth was decreased in relation to the non-grafted plants. Starch depletion in the root system of P. edulis was directly related to the severity of the Fusarium wilt. P. gibertii was confirmed as a Fusarium wilt resistant rootstock of P. edulis, with minimal influence of the grafting height for the control of the disease.

A laranjeira ‘Pera’ é das principais variedades cultivadas e praticamente a única com maturação na meia-estação no Brasil. Outras variedades similares ou superiores implicariam ganhos na cadeia de processamento de sumo. Avaliaram-se 29 variedades de laranja introduzidas de países mediterrâneos em dois experimentos separados. O porta-enxerto utilizado foi a tangerineira ‘Sunki’ e o delineamento experimental foi em blocos ao acaso, com duas plantas por parcela e três repetições. A plantação de sequeiro foi realizada em maio de 2001, em Bebedouro, Norte do Estado de São Paulo, Brasil, em clima subtropical. Nos anos de 2005 a 2008, avaliaram-se os seguintes parâmetros: crescimento da árvore, produção e qualidade físico-química dos frutos. As seleções ‘Do Tua Graúda’/146, ‘Do Tua Sr. Mamede’/148, ‘Do Tua’/149, ‘Do Tua’/160, ‘Do Tua’/176, ‘Convento’/155, ‘Grada’/158, ‘De Setúbal’/174, ‘De Setúbal’/180, ‘Pera da Vidigueira Sr. Antunes’/159, ‘Sanguínea’/144, Amares’/150, ‘Prata da Ponte’/151, ‘Prata Lima’/152, ‘Pala’/153, ‘Portela’/154, ‘Évora’/157, ‘De Vale dos Besteiros’/161, ‘Biondo Corigliano’/164, ‘Vera’/166, ‘Entrefina’/168, ‘De Vale dos Besteiros’/175, ‘Laranja R.A.H.’/177 e ‘Maçã’/182 são adequadas para cultivo em sequeiro em região de clima subtropical no Brasil visando processamento para produção de suco. ‘Pardilhó’/169 poderia ser explorada para o mercado de fruta fresca, uma vez que se trata de uma cultivar do grupo das laranjas-de-umbigo ou “navel”.

‘Pera’ is one of the major sweet orange commercial varieties and it is the only one being harvested in the mid-season in Brazil. Similar or superior mid-season cultivars could improve the gains in the juice processing chain. In this work, we evaluated 29 sweet orange selections introduced in Brazil from Mediterranean countries. Several sweet orange varieties were evaluated in two distinct experiments. In both trials, the rootstock was Sunki mandarin and the experimental design was in randomized blocks, with three replications and two trees in the unit. The experimental plots were planted on May 2001 in Bebedouro, northern São Paulo State, Brazil, in an oxisol under rain-fed cultivation in subtropical climate. Collected data included tree growth, yield, and physical and chemical fruit traits from 2005 thru 2008. ‘Do Tua Graúda’/146, ‘Do Tua Sr. Mamede’/148, ‘Do Tua’/149, ‘Do Tua’/160, ‘Do Tua’/176, ‘Convento’/155, ‘Grada’/158, ‘De Setúbal’/174, ‘De Setúbal’/180, ‘Pera da Vidigueira Sr. Antunes’/159, ‘Sanguínea’/144, Amares’/150, ‘Prata da Ponte’/151, ‘Prata Lima’/152, ‘Pala’/153, ‘Portela’/154, ‘Évora’/157, ‘De Vale dos Besteiros’/161, ‘Biondo Corigliano/164’, ‘Vera’/166, ‘Entrefina’/168, ‘De Vale dos Besteiros’/175, ‘Laranja R.A.H.’/177 and ‘Maçã’/182 are suitable for rain-fed cultivation in a subtropical region of Brazil, aiming to juice processing. ‘Pardilhó’/169 could be used for fresh market because it is a navel orange.