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Insights into population structure and epidemiology of Phytophthora infestans from Nicaragua

Blandón-Díaz, Jorge Ulises (2011). Insights into population structure and epidemiology of Phytophthora infestans from Nicaragua. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2011:36
ISBN 978-91-576-7581-1
[Doctoral thesis]

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Late blight caused by Phytophthora infestans (Mont) de Bary is a constraint to both potato and tomato crops in the northern highlands of Nicaragua. This thesis describes studies on population structure and epidemiology of P. infestans from Nicaragua.

The genotypic and phenotypic variation in isolates of P. infestans collected in potato and tomato growing areas of northern Nicaragua were analyzed using genotypic (SSR fingerprinting and mtDNA haplotyping) and phenotypic markers (mating type, virulence and fungicide sensitivity). Genotypic markers revealed no polymorphism among the P. infestans isolates tested. Phenotypic variation was observed. Nicaraguan population of P. infestans is dominated by a clonal lineage of the A2 mating type, Ia mtDNA haplotype and no evidence of genetic population differentiation among potato and tomato isolates was found.

The aggressiveness of P. infestans isolates sampled from potato and tomato fields was determined through cross-inoculations experiments. Potato and tomato isolates both had a shorter LP, higher SP, and were more aggressive on tomato leaflets compared to potato ones.

The adequacy of the late blight simulation model LATEBLIGHT (version LB2004) was evaluated under Nicaraguan conditions. During 2007-2008 field experiments were conducted in Nicaragua. The simulation model was considered adequate as it accurately predicted high disease severity in susceptible cultivars without fungicide sprays, and demonstrated a decrease in the disease progress curves with additional fungicide applications, similar to that observed in the field plots. The quantitative relationship between host resistance and the need for fungicide was also investigated using simulations performed with LATEBLIGHT, as well as field trials.

Authors/Creators:Blandón-Díaz, Jorge Ulises
Title:Insights into population structure and epidemiology of Phytophthora infestans from Nicaragua
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :20 April 2011
Number of Pages:74
I.Blandón-Díaz, J.U., Widmark, A.-K., Hannukkala, A., Andersson, B., Högberg, N., and Yuen, J.E. (2011). Phenotypic variation within a clonal lineage of Phytophthora infestans infecting both tomato and potato in Nicaragua. Phytopathology. (Accepted with revisions).
II.Blandón-Díaz, J.U., Högberg, N., Grönberg, L., Widmark, A.-K., and Yuen, J.E. (2011). Aggressiveness and genotyping of Phytophthora infestans isolates from Nicaragua. (Manuscript).
III.Blandón-Díaz, J.U., Forbes, G.A., Andrade-Piedra, J.L., and Yuen, J.E. (2011). Assessing the adequacy of the simulation model LATEBLIGHT under Nicaraguan conditions. Plant Disease. (In press).
IV.Blandón-Díaz, J.U., Forbes, G.A., Taipe, A., Knutsson, J., Andrade-Piedra, J.L., and Yuen, J.E. Epidemiological significance of the quantitative relationship between host resistance and fungicide usage. (Manuscript).
Place of Publication:Uppsala
Publisher:Dept. of Forest Mycology and Pathology, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7581-1
Publication Type:Doctoral thesis
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Plant and forest protection
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:phytophthora infestans, solanum tuberosum, lycopersicon esculentum, blight, plant diseases, epidemiology, genotypes, host pathogen relations, disease resistance, simulation models, nicaragua
Keywords:Phytophthora infestans diversity, Epidemiology, LATEBLIGHT simulation model
Permanent URL:
ID Code:8080
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
External funders:Swedish International Development Cooperation Agency
Deposited By: Insights i JU Blandón-Díaz
Deposited On:26 Apr 2011 13:53
Metadata Last Modified:02 Dec 2014 10:45

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