Data/hora: 23/06/2024 19:49:00

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 12/08/1992
Data da última atualização: | 12/08/1992
Autoria: | WUTSCHER, H. K.; BISTLINE, F. W.
Afiliação: | United States Dept. of Agriculture, ARS, 2120 Camden Road, Orlando, FL 32803; Hort. Research Dept., Coca-cola Foods, P.O. Box 368, Plymouth, FL 32768.
Título: | Frequency and distribution of citrus blight in a test of new hybrid rootstocks.
Ano de publicação: | 1991
Fonte/Imprenta: | Proc. Fla. State Hort. Soc., v.104, p.178-180, 1991.
Idioma: | Inglês
Conteúdo: | The number of trees affected by citrus blight in a "Valencia" orange rootstock test planted in 1980 was recorded in April 1991. The test was part of a commercial grove on the lower ridge near Sebring and consisted of four 4-tree replications of trees on 19 rootstocks, 7 of them new, unnamed hybrids. Trees on 11 of the 19 rootstocks were included in the blight survey, a total of 176 trees, 16 trees on each rootstock. Eleven trees with visual symptoms of blight had been removed before the survey. The remaining tree were inspected visually, and 66 trees were tested by water injection with a syringe and analysis of the trunk  wood for zinc and potassium. All trees with visual symptoms were tested; when alltrees in a 4-tree plot were healthy, one randomly chosen tree was tested. There were more blighted trees in replications 1 and 2 than in replications 3 and 4, where soil Ca and Mg were lower. Trees on FF-3-16-69, a hybrid of Christiansen trifoliate orange X Cleopatra, were most severely affected by blight (7/16 trees), followed by trees on FF-3-15-11, Cleopatra X Carrizo and rough lemon 76-645 (5/16 trees); FF-3-16-54, Cleopatra X Swingle trifoliate orange, and citrangequat CPB-48032 (4/16 trees); FF-3-15-70, Cleopatra X Swingle trifoliate orange (3/16); FF-3-8-8, Rangpur X Swingle trifoliate orange (2/16); and Carrizo and C54-64-8, Rangpur X Troyer (1/16). No blighted trees were found on Flying Dragon trifoliate orange and Swingle citrumelo.
Palavras-Chave: | Citrus blight susceptibility; distribution; soil Ca and Mg.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)

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