Alternative production methods of containergrown citrus nursery trees related to prevention of citrus sudden death disease. / Métodos alternativos de produção de mudas cítricas em recipientes na prevenção da morte súbita dos citros.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Citrus Sudden Death (CSD) is a new disease detected in the citrus industry in São Paulo State, Brazil. It affects all citrus varieties budded on ‘Rangpur’ Lime (Citrus limonia Osbeck), causing lost of vigor and leaf brightness, root system destruction, yield reduction, degeneration of rootstock phloem tissue and death of plants in few months. CSD has a great potential to destroy millions of plants such as Citrus Tristeza Virus has caused between 1930 and 1940. Alternative production methods of container-grown citrus nursery trees could prevent some effects of CSD, for instance, by the use of tolerant inarchings, citrus cuttings, or even interstocks in incompatible scion/rootstock combinations. This work evaluated the following alternative production methods of citrus aiming to prevent occurrence of CSD in groves: 1) production of citrus inarchings using eleven rootstocks in four container types: 290mL tubes and 1,7L and 4,5L plastic bags; 2) production of Pera sweet orange (Citrus sinensis L. Osbeck) nursery trees on incompatible Swingle citrumelo (Poncirus trifoliata x Citrus paradisi) and Volkamer lemon (Citrus volkameriana Pasquale) with four interstocks: Valencia and Hamlin sweet oranges (Citrus sinensis L. Osbeck), Sunki mandarin (Citrus sunki Hort. ex Tanaka) and Cleópatra mandarin (Citrus reshni Hort. ex Tanaka); 3) production of citrus inarchings and nursery trees using Swingle citrumelo cuttings. Herbaceous, semi-hardwood and hardwood cuttings were used and were submitted to IBA solution (0 or 500mg L-1) and budded before rooting. Production of inarchings directly sowed in 1,7L containers resulted in rootstocks ready for use about 100 to 150 days after sowing with more vigorous plants and well shaped root system. Interstocking is a promising citrus propagation technique especially regarding incompatible combinations, and could allow the use of Pera sweet orange on Swingle citrumelo in areas affected by CSD. On the other hand, the production cycle is longer, up to 17 months from sowing, besides producing a higher percentage of inadequate plants. Twoleaf herbaceous cuttings are indicated for appropriate rooting and multiplication of Swingle citrumelo.

ASSUNTO(S)

citricultura nursery trees – production propagation porta-enxertos citrus sudden death disease rootstocks morte súbita dos citros cultivo protegido mudas – produção citriculture

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