Could tree density play a role in managing Citrus Huanglongbing epidemics?

Moreira, Alécio Souza; Stuchi, Eduardo Sanches; Silva, Pedro R. B.; Bassanezi, R. B.; Girardi, Eduardo Augusto; Laranjeira, F. F.

doi:10.1007/s40858-019-00284-1

Cited by 20 publications

(17 citation statements)

References 18 publications

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“…In addition, high planting density could play a role in the management of HLB epidemics. Moreira et al 2019) observed lower cumulative HLB incidence in citrus plots with higher tree densities.…”

Section: New Orchards For Hlb Managementmentioning

confidence: 69%

Overview of citrus huanglongbing spread and management strategies in Brazil

Bassanezi

Lopes

Miranda

et al. 2020

Trop. plant pathol.

104

133

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Huanglongbing (HLB) has been a serious threat to the citrus industry worldwide. After its first report in São Paulo State, the main citrus production area in Brazil, the disease spread to the States of Minas Gerais, Paraná and Mato Grosso do Sul. Attempts to cure plants or remiss disease symptoms and damages have been evaluated and showed to be inefficient and nonviable. The development of resistant or tolerant varieties to the bacteria or its insect vector, the Asian citrus psyllid Diaphorina citri, is still a long term challenge. Earlier HLB management has been based on preventive measures such as planting of healthy nursery trees, elimination of diseased trees, and vector control. Supported by both research data and citrus grower experiences, HLB management in São Paulo and Triângulo/Sudoeste Mineiro citrus belt has been improved from measures individually applied only into the orchards to regional disease management, including differentiated psyllid control in the orchards based on tree location and shoot flushing, area-wide coordinated control of psyllids, and removal of inoculum sources in noncommercial properties in the vicinity of commercial orchards. In addition, the negative impact of HLB on orchard production and longevity has been reduced with wide adoption of better cultural practices such as high-density planting, irrigation, and adequate nutrition. Unlike in other countries where HLB reached epidemic levels, the management of HLB in São Paulo and Triângulo/Sudoeste Mineiro citrus belt has been considered a success case and has ensured the maintenance of citrus production and competitiveness of the Brazilian citrus industry while new, more durable, and sustainable measures are not yet available.

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Section: New Orchards For Hlb Managementmentioning

confidence: 69%

Overview of citrus huanglongbing spread and management strategies in Brazil

Bassanezi

Lopes

Miranda

et al. 2020

Trop. plant pathol.

104

133

View full text Add to dashboard Cite

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“…In the case of the harvested area, this increase was related to the establishment of fruit processing industries aiming at the production of juice, especially in the northern and northwestern Paraná, the favorable soil and climate conditions for citrus production, the strong organization of citrus growers in cooperatives or associations, technical assistance, support for agricultural research and defense (AULER et al, 2014), prices reached by producers in the last harvests, and the growth potential of domestic and foreign markets (TAZIMA et al, 2008). Among the factors that have contributed to the improvement of orange production and productivity, the following stood out: more intensive use of inputs such as agricultural machines, implements, fertilizers, and pesticides; an improvement in the quality of genetic material, which enabled different species and varieties to adapt to the growing environment (MODA-CIRINO et al, 2012); management improvements (LEITE JUNIOR; MOHAN;1990;VARGAS et al, 2013), with emphasis on the densification of orchards, which is one of the practices for the control of diseases such as Huanglongbing (FUKUDA et al, 2010;MOREIRA et al, 2019). The harvested area and production increases were noted in advance by rural credit financing to finance production.…”

Section: Resultsmentioning

confidence: 99%

Spatial dynamics of orange production in the state of Paraná, Brazil

2020

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The aim of this study was to identify and qualify the microregions specialized in orange production and the spatial dynamics of citrus production in the state of Paraná, Brazil. For this purpose, data from the Brazilian Institute of Geography and Statistics and the Brazilian Central Bank were used. The location quotient (LQ) methodology was applied, the principal component analysis (PCA) and the cluster analysis were carried out, and information regarding the location of industries and agribusiness cooperatives that process orange juice in the state of Paraná was collected. The LQ results, subdivided into 5-year periods, denote changes in the spatial dynamics of orange production. Between 1998Between -2002Between and 2013Between -2017, the specialized microregions increased from nine to 11; in addition, the consolidation of a citrus belt, which extended from the northwestern to the northeast area of Paraná, took place. Two main components explained 89.16% of the total data variability and four clusters were identified. The microregion of Paranavaí was the most specialized and the most important for the orange production chain in Paraná. The dynamics of orange production were spatially associated with the location of industries and agribusiness cooperatives in the sector, which were concentrated in the northwestern and mid-northern Paraná.

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“…m −3 to the 'Folha Murcha' sweet orange scion in 7-year-old trees (Cantuarias-Avilés et al 2011). In addition, high-density planting can also contribute to the HLB management in endemic areas (Moreira et al 2019).…”

Section: Discussionmentioning

confidence: 99%

Huanglongbing incidence, canopy volume, and sprouting dynamics of ‘Valencia’ sweet orange grafted onto 16 rootstocks

Rodrigues

Moreira

Stuchi

et al. 2020

Trop. plant pathol.

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Huanglongbing (HLB), the most important citrus disease worldwide, is associated with bacteria transmitted by the Asian citrus psyllid (ACP) preferably through new shoots present in the canopy. In a commercial citrus plant, the vegetative growth of the scion is influenced by the rootstock variety in which it is grafted. Although all commercial citrus varieties planted in recent years are susceptible to HLB, the dynamics of the rootstock in grafted plant could influence the progress of HLB, whether at the plant or grove scale. In this work, HLB incidence in 'Valencia' sweet orange grafted onto 16 rootstocks and its relationship to the tree canopy volume and flushing dynamics were evaluated in a field trial under ACP control. The experiment was conducted under rainfed conditions in Bebedouro, state of São Paulo, Brazil, from 2011 to 2019. 'Flying Dragon' trifoliate orange known for its dwarfing characteristics was used as the rootstock. A reduction in canopy volume by 77% at 8 years of age were observed compared to the most vigorous rootstocks. The frequency of flush shoots of 'Valencia' sweet orange was not influenced by the rootstock, but the abundance of flush shoots was lower on three semi-dwarfing rootstocks and as well as 'Flying Dragon'. Although HLB incidence on 'Flying Dragon' was lower than on 'Rangpur' lime and other three semi-standard rootstocks (trees with canopy volume between 51 and 75% of the 'Rangpur' lime canopy volume), all other combinations had similar HLB disease progress regardless of the canopy volume and flushing dynamics. Moreover, under field conditions, variations on the cumulative HLB incidence greater than 26% were necessary to significantly separate rootstocks. Therefore, the results suggest that true dwarfing rootstocks have potential to integrate the management program for HLB and that mechanisms in addition to tree vigor appear to be involved in the host-vector relationship.

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Could tree density play a role in managing Citrus Huanglongbing epidemics?

Cited by 20 publications

References 18 publications

Overview of citrus huanglongbing spread and management strategies in Brazil

Overview of citrus huanglongbing spread and management strategies in Brazil

Spatial dynamics of orange production in the state of Paraná, Brazil

Huanglongbing incidence, canopy volume, and sprouting dynamics of ‘Valencia’ sweet orange grafted onto 16 rootstocks

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