Effect of Citrus Sudden Death on Yield and Quality of Sweet Orange Cultivars in Brazil

Bassanezi, R. B.; Montesino, L. H.; Sanches, André L.; Sposito, María Encarnação Beltrão; Stuchi, Eduardo Sanches; Barbosa, José Carlos

doi:10.1094/pdis-91-11-1407

Cited by 14 publications

(10 citation statements)

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“…In contrast to coffee where alternate bearing is homogeneous within a season for each block of plants, in citrus, neighbour plants show different behavior in the same year, with high yielding and low yielding plants, which makes it impossible to forecast the yield based on the previous year's data (Ye et al 2008a, b). Large variation in fruit yield and number of fruits per tree for the same healthy sweet orange cultivars has also been observed in other studies (Bassanezi et al 2007;Palazzo 1993). Such variation contributes to the relatively low coefficients of determination (R 2 from 0.10 to 0.44) of the negative exponential model for relative yield and HLB severity even though these relationships were statistically highly significant (P<0.01) for all cultivars (Table 4).…”

Section: Discussionsupporting

confidence: 83%

Yield loss caused by huanglongbing in different sweet orange cultivars in São Paulo, Brazil

et al. 2011

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Citrus huanglongbing (HLB) reduces an affected orchard's economic life. This work aimed to characterize yield loss due to HLB for different sweet orange cultivars and determine the relationship between disease severity and yield. Disease severity and yield were assessed on 949 individual trees distributed in 11 different blocks from sweet orange cultivars Hamlin, Westin, Pera and Valencia. In each block, plants showing a range of HLB severity levels and asymptomatic plants were selected. Total yield (weight of harvested fruit), mean weight of asymptomatic and symptomatic fruit, relative yield (symptomatic tree yield/mean yield of asymptomatic trees from the same block) and relative number of fruits (fruit number from symptomatic tree/mean number of fruits from asymptomatic trees from the same block) were determined. The weight of symptomatic fruit was lower than the weight of asymptomatic fruit, but the weights of asymptomatic and symptomatic fruit were not correlated with disease severity, indicating that the effects of HLB were restricted to symptomatic branches. The relationship of the relative yield with HLB severity can be satisfactorily described by a negative exponential model. The rates of yield decrease as a function of disease severity were similar for all assessed cultivars. A relative yield (up to 19%) was observed even for trees where disease severity was 100%. The strong linear relationship between relative number of fruits per tree and the relative yield per tree suggested that the yield reduction was due primarily to early fruit drop or lack of fruit set on affected branches.

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Section: Discussionsupporting

confidence: 83%

Yield loss caused by huanglongbing in different sweet orange cultivars in São Paulo, Brazil

et al. 2011

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“…Recently, CSD-symptoms have been also detected in sweet oranges grafted on other rootstocks (e.g., Citrus volkameriana , Citrus jambiri and Citrus pennivisiculata Lush) [5]. Citrus plants affected by CSD show general decline symptoms characterized by pale green coloration of leaves, different levels of defoliation, death of the root system, and a characteristic development of yellow stain in the phloem of the rootstock [6], which is the main diagnostic symptom of this disease [3,6]. However, these affected plants had an incubation period of at least 2 years before symptoms were detected [1,6], which may result in delay of management of the disease.…”

Section: Introductionmentioning

confidence: 99%

“…Citrus plants affected by CSD show general decline symptoms characterized by pale green coloration of leaves, different levels of defoliation, death of the root system, and a characteristic development of yellow stain in the phloem of the rootstock [6], which is the main diagnostic symptom of this disease [3,6]. However, these affected plants had an incubation period of at least 2 years before symptoms were detected [1,6], which may result in delay of management of the disease. Although the etiology of CSD has not been definitively determined, Maccheroni et al [1] reported a significant correlation at 99.7% between CSD symptoms and the presence of CSDaV, and suggested that it is probably spread by an aphid vector.…”

Section: Introductionmentioning

confidence: 99%

Genetic Structure and Molecular Variability Analysis of Citrus sudden death-associated virus Isolates from Infected Plants Grown in Brazil

Matsumura

Coletta-Filho²,

Dorta³

et al. 2016

Viruses

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Citrus sudden death-associated virus (CSDaV) is a monopartite positive-sense single-stranded RNA virus that was suggested to be associated with citrus sudden death (CSD) disease in Brazil. Here, we report the first study of the genetic structure and molecular variability among 31 CSDaV isolates collected from both symptomatic and asymptomatic trees in CSD-affected areas. Analyses of partial nucleotide sequences of five domains of the CSDaV genomic RNA, including those encoding for the methyltransferase, the multi-domain region (MDR), the helicase, the RNA-dependent RNA polymerase and the coat protein, showed that the MDR coding region was the most diverse region assessed here, and a possible association between this region and virus adaption to different host or plant tissues is considered. Overall, the nucleotide diversity (π) was low for CSDaV isolates, but the phylogenetic analyses revealed the predominance of two main groups, one of which showed a higher association with CSD-symptomatic plants. Isolates obtained from CSD-symptomatic plants, compared to those obtained from asymptomatic plants, showed higher nucleotide diversity, nonsynonymous and synonymous substitution rates and number of amino acid changes on the coding regions located closer to the 5’ end region of the genomic RNA. This work provides new insights into the genetic diversity of the CSDaV, giving support for further epidemiological studies.

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“…Indeed, alternate fruit bearing has been demonstrated in citrus for healthy plants (Ye et al. , 2008a,b) and plants with CVC (Palazzo & Carvalho, 1992; Palazzo, 1993) or with citrus sudden death (Bassanezi et al. , 2007), occurring mainly in late varieties in adult plants (Tazima et al.…”

Section: Discussionmentioning

confidence: 99%

Relationship between sweet orange yield and intensity of Citrus Variegated Chlorosis

Gonçalves

Stuchi²,

Lourenço

et al. 2011

Plant Pathology

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Citrus Variegated Chlorosis (CVC) is currently present in approximately 40% of citrus plants in Brazil and causes an annual loss of around 120 million US dollars to the Brazilian citrus industry. Despite the fact that CVC has been present in Brazil for over 20 years, a relationship between disease intensity and yield loss has not been established. In order to achieve this, an experiment was carried out in a randomized block design in a 3 · 2 factorial scheme with 10-year-old Natal sweet orange. The following treatments were applied: irrigation with 0, 50 or 100% of the evapotranspiration of the crop, combined with natural infection or artificial inoculation with Xylella fastidiosa, the causal agent of CVC. The experiment was evaluated during three seasons. A negative exponential model was fitted to the relationships between yield versus CVC severity and yield versus Area Under Disease Progress Curve (AUDPC). In addition, the relationship between yield versus CVC severity and canopy volume was fitted by a multivariate exponential model. The use of the AUDPC variable showed practical limitations when compared with the variable CVC severity. The parameter values in the relationship of yield-CVC severity were similar for all treatments unlike in the multivariate model. Consequently, the yield-CVC intensity relationship (with 432 data points) could be described by one single model: y = 114AE07 exp()0AE017 x), where y is yield (symptomless fruit weight in kg) and x is disease severity (R 2 = 0AE45; P < 0AE01).

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Effect of Citrus Sudden Death on Yield and Quality of Sweet Orange Cultivars in Brazil

Abstract: Bassanezi, R. B., Montesino, L. H., Sanches, A. L., Spósito, M. B., Stuchi, E. S., and Barbosa, J. C. 2007. Effect of citrus sudden death on yield and quality of sweet orange cultivars in Brazil.

Cited by 14 publications

References 10 publications

Yield loss caused by huanglongbing in different sweet orange cultivars in São Paulo, Brazil

Yield loss caused by huanglongbing in different sweet orange cultivars in São Paulo, Brazil

Genetic Structure and Molecular Variability Analysis of Citrus sudden death-associated virus Isolates from Infected Plants Grown in Brazil

Relationship between sweet orange yield and intensity of Citrus Variegated Chlorosis

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