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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Moreira, Alecio Souza [1] ; Stuchi, Eduardo S. [1] ; Silva, Pedro R. B. [2] ; Bassanezi, Renato B. [3] ; Girardi, Eduardo A. [1] ; Laranjeira, Francisco F. [1]
Total Authors: 6
[1] Embrapa Cassava & Fruits, BR-44380000 Cruz Das Almas, BA - Brazil
[2] Rua Marialva 265, BR-83324180 Pinhais, PR - Brazil
[3] Fundo Def Citricultura Fundecitrus, BR-14801970 Araraquara, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: TROPICAL PLANT PATHOLOGY; v. 44, n. 3, p. 268-274, JUN 2019.
Web of Science Citations: 0

Citrus Huanglongbing (HLB) management relies on adoption of preventive measures including the use of healthy nursery trees, area-wide control of the vector Diaphorina citri, and eradication of symptomatic trees. Cultural practices including tree density could contribute to HLB management. We investigated the role of tree density on the incidence of HLB using a historical dataset from commercial orchards in Sao Paulo State, Brazil. The HLB incidence from 2013 to 2015 was compared through 495 blocks of different tree ages (3 to 13years old), tree localization within the farm (edge or non-edge), and tree densities (from 220 to 714 treesha(-1)) according to the tree spacing used. Diaphorina citri was controlled rigorously in all commercial blocks using drench applications of systemic insecticides and foliar sprays of contact insecticides. The results indicated that cumulative HLB incidence was predominantly lower at higher tree densities. In addition to vector control and removal of HLB-symptomatic trees, planting of trees in high densities may reduce the proportions of HLB-infected trees, thereby contributing to improved profitability for farmers in HLB-endemic sites. In particular, this management practice should be applied at the edges of farms. (AU)

FAPESP's process: 14/26758-0 - Citrus HLB citrus: selection for resistance, survival analysis of scion / rootstock combinations and planting systems
Grantee:Eduardo Sanches Stuchi
Support type: Regular Research Grants