Avaliação de quatro genótipos de coqueiro na região noroeste de São Paulo.

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Comportamento do coqueiro em Bebedouro, São Paulo.

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Avaliação de quatro genótipos de coqueiro na região noroeste de São Paulo.

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Incidence of Huanglongbing on several sweet orange cultivars budded onto different rootstocks at the Citrus Experimental Station (EECB), Bebedouro, São Paulo, Brazil.

Huanglongbing (HLB), caused by Candidatus Liberibacter asiaticus and Ca. L. americanus and vectored by Diaphorina citri Kuwayama, was first reported in 2004 in Brazil and it is currently widespread in São Paulo State (Belasque et al., 2010). The EECB, in partnership with Embrapa Cassava & Fruits, conducts a citrus improvement program aimed to select scion and rootstock Citrus cultivars mainly focused on the resistance or tolerance to biotic and abiotic stresses

Trifoliata Flying Dragon: Porta-enxerto para plantios adensados e irrigados de laranjeiras doces de alta produtividade e sustentabilidade.

bitstream/item/77671/1/Comunicado-152.pdf(Embrapa Mandioca e Fruticultura. Comunicado técnico, 152)

Limeira ácida 'Galegão': opção às limeiras ácidas 'Galego' e 'Tahiti' na diversificação de pomares.

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Produção de mudas de citros em viveiro protegido, utilizando diferentes combinações de copa e de porta-enxerto.

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HLB Progress on Tahiti acid lime grafted onto eight rootstocks

The State of São Paulo is the main Tahiti (Persian) lime producer in Brazil with 65% of 43,000 ha grown in Brazil.  In 2003, an experiment was planted in the Citrus Experimental Station (EECB), Bebedouro, Northern São Paulo State, with the objective of characterizing the performance of Tahiti acid lime grafted onto eight rootstocks: Davis A and Flying Dragon trifoliate oranges, Swingle citrumelo, HRS 849 [“citradia 1708” (Argentina trifoliate orange x Smooth Flat Sevile)], Morton citrange, Rangur lime and Volkamer lemon, at 8 x 5 m spacing. In 2004, citrus huanglongbing (HLB), was first reported in the São Paulo State and the trees in the experiment started to show HLB symptoms in 2009. From July 2010 to May 2012, disease severity was evaluated four times and the bacteria titer quantified once. The numbers of qPCR positive replications were in a range of five to eight. Severity data was used to calculate the area under the disease severity progress curve (AUDSPC). The data were analyzed by Fisher LSD test (5%). Flying Dragon and Davis A trifoliate oranges, and Swingle citrumelo, had lower values of AUDSPC, differing from Morton citrange, Orlando tangelo, Rangpur lime and Volkamer lemon. The citradia HRS 849 [citradia 1708 (Argentina trifoliate orange x Smooth Flat Sevile) had intermediate behavior. The canopies were removed but the rootstocks are still alive, so, new studies using the rootstock’s new shoots and the roots will be done aiming to quantify Candidatus Liberibacter asiaticus titer in them and to confirm the rootstock’s tolerance identified in the canopies

Evidence that ‘flying dragon’ trifoliate orange delays HLB symptom expression for four sweet orange cultivars, Tahiti lime and Okitsu mandarin

Huanglongbing (HLB), caused by Candidatus Liberibacter asiaticus and vectored by Diaphorina citri, was first reported in 2004 in Brazil and is currently widespread in São Paulo State. Brazil is the world’s largest sweet orange producer and has 49,000 ha cultivated with ‘Tahiti’ lime acid lime. Mandarin cultivation represents 5.5% of total citrus production in the country. In 2001, three experiments were planted in the Citrus Experimental Station (EECB), Bebedouro, Northern São Paulo State, where the first HLB symptomatic tree was detected in 2006. The initial objective was to evaluate the performance of ‘Folha Murcha’ sweet orange, ‘Tahiti’ acid lime and ‘Okitsu’ mandarin grafted on twelve rootstocks including Rangpur lime, Swingle citrumelo, Rubidoux and Flying Dragon (FD) trifoliate oranges. Cumulative HLB incidence (CI) was calculated in 2009. Folha Murcha and Tahiti lime trees on FD had lower CI values (6.7 and 10%) than trees on Rangpur lime (33.3 and 80%), Swingle citrumelo (46.7 and 66.7%) and Rubidoux (46.7 and 60%). CI was similar for Okitsu on FD, Carrizo citrange and HRS 827 (11.1%). In another field trial at EECB, Valencia, Hamlin and Natal were planted on FD in November 1994. Drip irrigation was installed in 2001. The first symptomatic plants in the area were detected in November 2008.  In 2010, the 16 yr-old trees on FD have a lower CI (5.6%) than 20 yr-old sweet orange trees on Swingle citrumelo in an adjacent trial (CI = 35.4%). Our results indicated that FD rootstock could prolong the longevity of citrus orchards but more well-controlled studies of scion-rootstocks combinations with and without vector management are required

Relação entre tamanho e deformidade de colo em porta-enxertos de Trifoliata Flying Dragon.

A produção das mudas de citros em ambiente protegido tem como objetivo principal garantir a sanidade dos materiais propagativos em relação a doenças limitantes à citricultura (CARVALHO et al., 2005). A qualidade horticultural das plantas produzidas nesse sistema de produção também é um componente importante para o sucesso da implantação de novos pomares, uma vez que danos na estrutura das mudas podem resultar em desenvolvimento inadequado após a transplantação (DAVIES; FERGUSON, 2000). Assim, a fase de produção dos porta-enxertos em recipientes exige uma série de cuidados, bem como a adoção de técnicas de manejo diferenciadas