+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Epidemiology of phytoplasma-associated papaya diseases in Queensland, Australia

Plant Disease 82(10): 1107-1111, Oct

Epidemiology of phytoplasma-associated papaya diseases in Queensland, Australia

Three phytoplasma-related diseases of papaya (Carica papaya), dieback, yellow crinkle, and mosaic, are recognized within Australia. Immature leaf material was sampled every week for 8 months from a cohort of 60 female plants, located within a commercial papaya plantation, to determine the minimum time between infection and symptom expression. Phytoplasma DNA was detected using the polymerase chain reaction (PCR) with primers specific for phytoplasmas in general, and for the stolbur group of phytoplasmas. The dieback-associated phytoplasma was detected 1 week prior to (four cases) or the same week (nine cases) as symptom expression, while phytoplasma DNA was detected between 3 and 11 weeks prior to expression of mosaic symptom (six cases). Lateral shoot regrowth on the lower stem of plants which had suffered dieback disease failed to generate stolbur-specific PCR products in 15 cases. A dual infection with dieback and yellow crinkle or mosaic was diagnosed in a further two cases, using restriction fragment length polymorphism digests, and both cases were interpreted as secondary infections by the dieback-associated phytoplasma. Regrowth in three of seven cases of yellow crinkle- and three of nine cases of mosaic-affected plants tested positive for phytoplasma-specific DNA. Ratooning of dieback-affected plants and removal of yellow crinkle- or mosaic-affected plants is suggested for the management of these diseases.

Accession: 003127639

DOI: 10.1094/pdis.1998.82.10.1107

Related references

Padovan, A.C.; Gibb, K.S., 2001: Epidemiology of phytoplasma diseases in papaya in northern Australia. Using molecular tools, the spread of phytoplasma diseases in a papaya plantation was investigated for 3 years to identify phytoplasma strains affecting papaya, insect vectors and alternative plant hosts. Five phytoplasma strains (SPLL-V4, TBB, CaW...

Padovan, A.; Gibb, K., 2001: Epidemiology of phytoplasma diseases in Papaya and Northern Australia. Phytopathologische Zeitschrift 149(11-12): 649-658

Scott, P.T.; Guthrie, J.N.; White, D.T.; Walsh, K.B., 2000: Phytoplasma associated diseases of papaya in Australia An update. Journal of Plant Pathology 82(1): 73, March

Walsh, K.B.; Guthrie, J.N.; White, D.T., 2006: Control of phytoplasma diseases of papaya in Australia using netting. Three types of netting material (coarse, medium and fine mesh) were evaluated for exclusion of insects and thus control of phytoplasma diseases (especially dieback disease) of papaya. Disease incidence and yield parameters were recorded for a popu...

Elder, R.J.; Milne, J.R.; Reid, D.J.; Guthrie, J.N.; Persley, D.M., 2002: Temporal incidence of three phytoplasma-associated diseases of Carica papaya and their potential hemipteran vectors in central and south-east Queensland. Weekly or fortnightly records of the incidences of three phytoplasma diseases of papaya (dieback, yellow crinkle and mosaic) were taken over 4 years at three sites in central and southern Queensland. Outbreaks of dieback generally occurred between...

Liefting, L.W.; Padovan, A.C.; Gibb, K.S.; Beever, R.E.; Andersen, M.T.; Newcomb, R.D.; Beck, D.L.; Forster, R.L.S., 1998: 'Candidatus phytoplasma australiense' is the phytoplasma associated with Australian grapevine yellows, papaya dieback and Phormium yellow leaf diseases. Sequence comparisons and phylogenetic analysis of the 16S rRNA genes and the 16S/23S spacer regions of the phytoplasmas associated with Australian grapevine yellows, pawpaw dieback and Phormium yellow leaf diseases revealed minimal nucleotide diff...

White, D.; Blackall, L.; Scott, P.; Walsh, K., 1998: Phylogenetic positions of phytoplasmas associated with dieback, yellow crinkle and mosaic diseases of papaya, and their proposed inclusion in Candidatus Phytoplasma australiense and a new taxon, Caldidatus Phytoplasma australasia. International journal of systematic bacteriology 48(3): 941-951

Arocha, Y.; López, M.; Piñol, B.; Fernández, M.; Picornell, B.; Almeida, R.; Palenzuela, I.; Wilson, M.R.; Jones, P., 2005: 'Candidatus Phytoplasma graminis' and 'Candidatus Phytoplasma caricae', two novel phytoplasmas associated with diseases of sugarcane, weeds and papaya in Cuba. During 2003, surveys of sugarcane yellow leaf disease and papaya bunchy top-like disease were carried out on plantations in Havana province, Cuba, to determine the roles of weeds and Auchenorrhyncha insects in the epidemiology of these diseases. M...

White, D.T.; Blackall, L.L.; Scott, P.T.; Walsh, K.B., 1998: Phylogenetic positions of phytoplasmas associated with dieback, yellow crinkle and mosaic diseases of papaya, and their proposed inclusion in 'Candidatus Phytoplasma australiense' and a new taxon, 'Candidatus Phytoplasma australasia'. DNA extracted from 3 pawpaw plants (from Queensland, Australia) affected by dieback, yellow crinkle or mosaic diseases was subjected to PCR using phytoplasma-specific primers to amplify the 16S rRNA gene plus 16S-23S rRNA intergenic spacer region....

Nutter, F.W.Jr; Padovan, A.C.; Gibb, K.S., 1998: Epidemiology of two phytoplasma strains associated with yellow crinkle in papaya. Phytopathology 88(9 SUPPL ): S68, Sept