ABSTRACT
Peach rust caused by Tranzschelia discolor is one of the diseases that affect the crop leaf area throughout the growing season, causing damage to production and fruit quality. Considering that the temporal progress of this disease is little known, this study aimed to evaluate the disease progress throughout the productive cycle among different genotypes. The experiment was carried out in a peach orchard at “Instituto Federal Catarinense-IFC”/Rio do Sul Campus. Evaluated genotypes were Granada, Dourado 1, Dourado 2, Douradão, Ouro, Chimarrita, Flordaprince, Premier, Aurora and Della Nona. Four plants from each genotype were selected and the disease severity was weekly evaluated, using a diagrammatic scale, after the start of sprouting in sixteen leaves from each plant. The disease progress curve for each genotype was adjusted to a logistic model, since the observed severity corresponded to the model and was confirmed by the consistency between the estimated points and by the residue. Dourado 1 genotype showed the highest disease rate (0.645) while Aurora showed the lowest rate (0.330). Douradão genotype showed the highest disease peak with 2.4% severity, and Chimarita and Dourado 1 had the lowest disease accumulation, 0.5%. Genotypes showed different peach rust progress behavior.
Keywords
Prunus persica; epidemiology; Tranzschelia discolor
