Data/hora: 19/06/2024 12:57:29

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 23/09/1993
Data da última atualização: | 23/09/1993
Autoria: | TIMMER, L. W.; BRLANSKY, R. H.; DERRICK, K. S.; LEE, R. F.
Afiliação: | Univ. Florida, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, FL 33850, USA.
Título: | Transmisssion of citrus blight by root gratf inoculation.
Ano de publicação: | 1991
Fonte/Imprenta: | Riverside, California: International Organization of Citrus Virologists, 1991.
Páginas: | p.244-249
Idioma: | Inglês
Notas: | Conference of the International Organization of Citrus Virologists, 11., 1991, Riverside, California, Proceedings...
Conteúdo: | In Juny, 1987, 12 mature, blight-affected Valencia sweet orange trees on rough lemon rootstocks were transplanted next to an equal number of healthy trees of the same cultivar. Eight to ten roots were approach-grafted to the adjacent healthy tree. By April 1989, 6 of the 12 previously healthy trees had visible blithy symptoms and by October 1989, 7 of 12 showed symptoms. All symptomatic trees had reduced water uptake, amorphous plugging in xylem vessels and zinc accumulation in trunk wood. None of the nongrafted control trees was was affected by the disease. In a second experiment, 14 Valencia sweet orange trees on rough lemon rootstock were grafted-inoculated with 8 root pieces each with slow water flow from blight-affected trees, a second group of 14 was no n-inoculated controls. After 2 yr, 11 of 14 trees inoculated with roots with slow water flow began to decline and showed all a of the diagnostic characteristics of blight. Eight of 14 trees inoculated with roots roots from blighted trees but with fast water flow, developed symptoms of the disease. All nongrafted control trees remained healthy. By 2-1/2 yr after inoculation, 13 of 14 trees inoculated with slow-flow roots, 9 of 14 inoculated with fast-flow roots and only 1 of 14 of the nongrafted controls was affeted by blight. Blight appears to be caused by an infectious agent that can be transmitted by root grafts.
Palavras-Chave: | Controle; Cultivar valencia; Declinio; Porta-enxerto.
Thesagro: | Crescimento; Doença; Laranja; Limão.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (13305-1) - ADC - PL - -- - 634.3040601 - C748p - 1992000183 - DIS