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Research Project: IPM Methods for Insect Pests of Orchard Crops

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Title: Survey of Poncirus trifoliata hybrids for resistance to colonization by Asian citrus psyllid

Author
item HALL, DAVID
item RAMADUGU, CHANDRIKA - UNIVERSITY OF CALIFORNIA
item Hentz, Matthew
item GMITTER, FRED - UNIVERSITY OF FLORIDA
item STOVER, EDDIE

Submitted to: Florida Entomologist
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/6/2018
Publication Date: 9/30/2019
Citation: Hall, D.G., Ramadugu, C., Hentz, M.G., Gmitter, F.G., Stover, E.W. 2019. Survey of Poncirus trifoliata hybrids for resistance to colonization by Asian citrus psyllid. Florida Entomologist.102(3):635-637.
DOI: https://doi.org/10.1653/024.102.0339

Interpretive Summary: Citrus greening is a serious disease caused by a bacterium transmitted by the Asian citrus psyllid. The genotype Poncirus is a citrus relative known to have resistance to colonization by the psyllid, and hybrids between Poncirus and Citrus are easily obtained. Field surveys indicated resistance to the psyllid was not expressed in any of 38 hybrids between Poncirus and Citrus. Three hybrids appeared to be resistant in one survey, but in another survey none of six similar hybrids exhibited resistance. Interestingly, colonization was reduced on a hybrid with Poncirus in the pedigree of both parents, supporting the possibility that resistant hybrids might be recovered through similar crosses.

Technical Abstract: Asiatic huanglongbing (HLB), also known as citrus greening or yellow shoot disease, is a serious disease putatively caused by the bacterium ‘Candidatus Liberibacter asiaticus’ (CLas) transmitted by the Asian citrus psyllid (ACP) (Diaphorina citri Kuwayama). Genetic traits in Poncirus trifoliata are known to confer resistance to colonization by the Asian citrus psyllid, but field surveys indicated these traits were not expressed in any of 24 simple hybrids between Poncirus trifoliata and sweet orange. No resistance to colonization by the psyllid was observed in 14 other types of Poncirus trifoliata hybrids. Three citrumelo hybrids appeared to be resistant in one survey, but in another survey none of six citrumelos exhibited resistance. Interestingly, colonization was somewhat reduced on a hybrid with Poncirus trifoliata in the pedigree of both parents, supporting the possibility that traits suppressing oviposition may be recovered through similar crosses.