Plant Disease (2003) 87, 896-900

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Ailton Reis, Christine D. Smart, William E. Fry, Luiz A. Maffia and Eduardo S.G. Mizubuti (2003)
Characterization of isolates of Phytophthora infestans from southern and southeastern Brazil from 1998 to 2000
Plant Disease 87 (8), 896-900
Abstract: The population of Phytophthora infestans in Brazil was first characterized 12 years ago. In this research, isolates of P. infestans from potato (n = 184) and tomato (n = 267) collected in southern and southeastern Brazil were characterized to provide more detailed analysis of the current structure of the population. All 451 isolates were analyzed for mating type, and subsets of the isolates were analyzed for allozymes, restriction fragment length polymorphism fingerprint, mtDNA haplotypes, and metalaxyl resistance. Tomato isolates were all of A1 mating type, mtDNA Ib, and US-1 genotype or some variant within this clonal lineage. Of the potato isolates, 82% were A2 mating type, mtDNA IIa, BR-1 genotype, which is a new lineage of P. infestans. All A2 isolates were found on potato, whereas 91% of the A1 isolates were from tomato. A1 and A2 isolates were never found in the same field. The frequency of resistance to metalaxyl was higher in isolates from tomato (55%) than in isolates from potato (38%). After more than a decade of coexistence of isolates of the A1 and A2 mating types, the population was highly clonal, dominated by the BR-1 and US-1 clonal lineages.
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Full text of article
Database assignments for author(s): Christine D. Smart, Eduardo S.G. Mizubuti, William E. Fry, Luiz A. Maffia

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Phytophthora infestans Potato (Solanum tuberosum) Brazil (south)
Phytophthora infestans Tomato (Solanum lycopersicum) Brazil (south)