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Effects of citrus varieties on the vector of the bacteria associated with the Huanglongbing (HLB) Diaphorina citri Kuwayama, 1908 (Hemiptera: Liviidae)

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Author(s):
Gustavo Rodrigues Alves
Total Authors: 1
Document type: Doctoral Thesis
Press: Piracicaba.
Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz
Defense date:
Examining board members:
Pedro Takao Yamamoto; Edson Luiz Lopes Baldin; Sergio Alves de Carvalho; André Luiz Lourenção; José Roberto Postali Parra
Advisor: Pedro Takao Yamamoto
Abstract

Huanglongbing (HLB) or \"greening\" is currently considered the most serious citrus disease worldwide, whose symptoms are associated with the bacteria \"Candidatus Liberibacter spp.\". Since there are no curative measures for the disease, management is based on curative measures like control of the pathogen vetor, Diaphorina citri. This insect has a range host of more than 50 species of the family Rutaceae, including species and varieties of the genus Citrus, but not all hosts allow the complete development of the insect. Thus, the objective of this study was to verify the existence of characteristics of citrus scion and rootstock varieties, more used in the citriculture, that affect the bioecological aspects of D. citri, as well as characterize them, serving as basis for development of management strategies for this insect vector. For this, were studied: 1) host choice behavior of D. citri in different combinations of scion and rootstock varieties and the identification of the volatiles involved; 2) the effects of scion and rootstock combinations on the biology of D. citri and 3) studies on the feeding behavior of D. citi using the Electrical Penetration Graph technique in different varieties of citrus scion. There was a differentiated choice behavior between males and females of D. citri depending on the host. The rootstock did not influence the choice behavior of D. citri. Significant differences were observed in the quality and quantity of the volatiles released by the different hosts, with the predominance of terpenoids. The biological variables of D. citri were affected by the hosts. The \'Hamlin\' variety was classified as less suitable to the psyllid independently of the rootstock used. There was influence of the citrus scion variety on the food intake of D. citri. Through EPG technique it is not possible to observe differences in the feeding behavior of D. citri among the hosts tested. (AU)

FAPESP's process: 13/04291-0 - Effects of citrus varieties on the bacteria associated Huanglongbing (HLB) vector, Diaphorina citri Kuwayama HLB, 1908 (Hemiptera: Liviidae)
Grantee:Gustavo Rodrigues Alves
Support type: Scholarships in Brazil - Doctorate