Data/hora: 02/06/2024 10:55:42

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 22/05/2015
Data da última atualização: | 18/05/2023
Autoria: | SILVA, S. X. B.; SOARES, A. C. F.; ALMEIDA, D. O.; SANTOS FILHO, H. P.; BARBOSA, F. F. L.
Afiliação: | S. X. B. SILVA, ADAB; A. C. F. SOARES, UFRB; D. O. ALMEIDA, UFRB; HERMES PEIXOTO SANTOS FILHO, CNPMF; FRANCISCO FERRAZ LARANJEIRA BARBOSA, CNPMF.
Título: | Temporal patterns of citrus greasy spot-induced defoliation of sweet orange cultivars in Brazil.
Ano de publicação: | 2015
Fonte/Imprenta: | Annals of Applied Biology, 2015.
ISSN: | ISSN 0003-4746
Idioma: | Inglês
Conteúdo: | Recôncavo Baiano is an area favourable for the occurrence of citrus greasy spot (CGS) (Mycosphaerella citri), but there has been no study of this pathosystem in Brazil. This work aimed to characterise the temporal patterns of CGS-induced defoliation in sweet orange cultivars ?Bahia? (Washington Navel) and ?Pêra?. Temperature, rainfall and relative humidity were recorded, as well as weekly defoliation (fallen leaves/canopy m2 or m3). Considering the mean of fallen leaves per canopy m2, and mean canopy area, the total annual defoliation was estimated to be around 32000 leaves per plant for ?Bahia? and 18500 for ?Pêra? sweet orange. Spectral density analysis showed that defoliation has a 5-week-long main cycle for both cultivars. The proportion of symptomatic fallen leaves was never below 0.97. The monthly number of fallen leaves per canopy area was positively correlated with the mean CGS incidence on leaves. Defoliation was significant, resulting in a low leaf density throughout the year. Many defoliation cycles and the very high proportion of symptomatic fallen leaves assure a constant inoculum supply. Based on these results, CGS cannot be considered a minor disease, at least in Recôncavo Baiano.
Palavras-Chave: | Pant damage.
Thesagro: | Fruta cítrica.
Thesaurus Nal: | Citrus; Defoliation; Epidemiology; Mycosphaerella citri.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (30670-1) - UPC - AP - DD - Publicação digital -  -  - DIS