Homalodisca coagulata (Hemiptera, Cicadellidae) Transmission of Xylella fastidiosa to Almond

Plant Disease
Rodrigo P P Almeida, A H Purcell

Abstract

Almond leaf scorch (ALS) is caused by the bacterium Xylella fastidiosa, transmitted by sharpshooter leafhoppers and spittlebugs. The recent invasion of a X. fastidiosa vector, Homalodisca coagulata (Hemiptera, Cicadellidae), into California may have major consequences to the spread of ALS because this insect feeds readily on trees, including stone fruit species. We found that, under laboratory conditions, H. coagulata acquired X. fastidiosa from symptomatic almond plants with low efficiency relative to grape (3.3 to 10% per individual per day). Inoculation efficiency also was low, approximately 4% per insect per day. H. coagulata inoculated 1-year-old woody tissues of almond plants at similar rates as green shoots. H. coagulata transmitted two X. fastidiosa grape strains from grape source plants to grape and almond. We also observed X. fastidiosa transmission to dormant almond plants. X. fastidiosa populations in the petioles of field-collected symptomatic almond leaves were not higher than 107 CFU/g of tissue, suggesting that low bacterial populations within almond are partially responsible for the lower acquisition rates observed from diseased almond compared with diseased grape, which are usually within the range of 108 to 1...Continue Reading

References

Feb 7, 2001·Applied and Environmental Microbiology·M HendsonB Kirkpatrick
Mar 5, 2004·Journal of Economic Entomology·Rodrigo P P Almeida, Alexander H Purcell
Jan 1, 1996·Annual Review of Phytopathology·A H Purcell, D L Hopkins

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Citations

Feb 25, 2005·BioTechniques·Blake Bextine, Thomas A Miller
Apr 22, 2008·Applied and Environmental Microbiology·Rodrigo P P AlmeidaJoao R S Lopes
Jul 8, 2009·Applied and Environmental Microbiology·Jennifer J RandallStephen F Hanson
Sep 11, 2007·Applied and Environmental Microbiology·Xiang Yang ShiDonald A Cooksey
Apr 1, 2005·Plant Disease·R P P AlmeidaA H Purcell
Nov 28, 2008·Environmental Entomology·Mark S Sisterson
Oct 16, 2016·Bacteriophage·Tushar Suvra BhowmickCarlos F Gonzalez
Apr 1, 2010·Plant Disease·R S Sanderlin, R A Melanson
May 15, 2019·EFSA Journal·UNKNOWN EFSA Panel on Plant Health (PLH)Stephen Parnell
Nov 5, 2013·Applied and Environmental Microbiology·Nabil Killiny, Rodrigo P P Almeida
Jul 1, 2006·Plant Disease·Elaine B ShaplandMario A Viveros

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