Data/hora: 24/05/2024 00:22:07

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 22/04/1997
Data da última atualização: | 22/04/1997
Autoria: | WALLACE, J. M.
Afiliação: | University of California Citrus Experiment Station, Reverside, California.
Título: | A half century of research on psorosis.
Ano de publicação: | 1959
Fonte/Imprenta: | Riverside, California: Universite of California, 1957.
Páginas: | p.5-21
Idioma: | Inglês
Notas: | In: CONFERENCE ON CITRUS VIRUS DISEASES, 1957, Riverside, California. Proceedings... Reverside, California: University of California, 1959.
Conteúdo: | The name psorosis is now used to designate a related group of virus diseases of citrus that have certain characteristics in common, notably the symptoms they produce on young leaves. The name was used by Swingle and Webber in 1896, when they first described the lesion-forming disease known at that time in Florida under the general name gummosis and in California as scaly bark or scaly bark gum disease. Later, in 1932, Fawcett gave the name psorosis "A" to the commonly occurrring form of the disease in order to distinguish it from a less common but more active type which he described as psorosis "B". In addition to psorosis "A" and psorosis "B", Fawcett et al have described four other types or varieties of psorosis: these are concave gum, blind pocket, crinkly leaf, and infectious variegation. The bark-lesion-forming types are known to have been present in California as early as 1891, and these andsome of the other types are now distributed throughout the important citrus-growing sections of the world. Psorosis "A" hasbeen a particularly important factor in citrus production in the United States. The gradual reduction in yield of affected trees and the eventual need for replacing such trees have been costly to the citrus grower. However, losses from psorosis can be avoided in new plantings of citrus if intelligent use is made of the knowledge that has accunulated during the past half century, largely from the studies of the late professor Howard S.Fawcett.
Palavras-Chave: | Citros; Citrus ap; Congress; Congresso; Control; Controle; Sintomas; Sintomatologia psorosis; Symptomatology.
Thesaurus Nal: | Citrus.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (13724-1) - ADD - PL - -- - 634.30406 - C748v - 1981000254 - DIS