Data/hora: 19/06/2024 04:43:51

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 15/09/1993
Data da última atualização: | 15/09/1993
Autoria: | TIMMER, L. W.; LEE, R. F.; BRLANSKY, J. H.; GRAHAM, J. H.; ALBRIGO, L. G.; DERRICK, K. S.; TUCKER, D. P. H.
Afiliação: | Univercity of Florida, IFAS Citrus Research and Education Center 700 Experiment Station Road Lake Alfred, FL 33850.
Título: | The infectious nature of citrus blight.
Ano de publicação: | 1992
Fonte/Imprenta: | Florida State Horticultural Society. v.105, p.21-26, 1992.
Idioma: | Inglês
Conteúdo: | In several experiments conducted over the last 10 yr, we have conclusively demonstrated the transmissibility of citrus blight by root grafting. Blighted donor trees were rootgrafted to healthy receptors in 3 experiments and 7 of 8, 7 of 7, and 7 of 12 trees developed blight symptoms in 2-4 yr. In all 3 experiments, only one noninoculated control developed symptoms. In an experiment where root pieces from  blighted trees were used as inoculum, all 5 inoculated trees developed blight after 3.5 yr, and all 6 controls remained healthy. In a more extensive experiment, 13 of 14 trees inoculated with non-conductive roots from blighted trees 9 of 14trees inoculated with conductive roots from blighted trees, but only 1 of 14 non-inoculated trees developed blight symptoms after 2.5 yr. In an attempt to transmit blight with soil, about 0.5 m3 of soil from beneath each of 10 trees was replaced with soil from beneath blighted trees and soil beneath controls was replaced with soil from beneath healthy trees. After 5 yr, none of the trees had developed blight. Teatment of stumps with glyposate was followed by appearance of toxicity symptoms in adjacent trees indicating the ocurrence of natural root grafts in field trees. Root-graft inoculations reproduced all the symptoms characteristic of blight including typical decline, zinc accumulation in trunk wood, sylem plugging, and reduced water uptake clearly demonstrating the infetious nature of the disease.
Palavras-Chave: | Citrus sinesis; Citrusjambhiri; Cultivar valencia; Doencas; Virose.
Thesagro: | Citrus Reticulata; Laranja Doce; Limão; Xylella Fastidiosa.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (2218-1) - ADC - AP - -- - 635.05 -  - 635.05 - DIS