Influência de porta-enxertos na ocorrência de bacteriose foliar no pessegueiro ‘BRS Kampai’

Abstract

The peach tree is susceptible to diseases, both aerial and root-related. It is common to find studies on the influence of portal grafts on diseases from the soil, in setback for leaf diseases this reality is not the same. Knowing this, came the motivation for this work. Bacteriosis is a disease caused by the bacterium Xanthomonas arboricola pv. Pruni, which affects peach leaves, fruits and branches or other species of the genus Prunus. The objective of this study was to evaluate the incidence and severity of leaf bacteriosis (bacterial leat spot - BLS) in the ‘BRS Kampai’ self-rooted and grafted on different holder grafts of the genus Prunus. The study was conducted in the experimental area of UTFPR, Campus Pato Branco. The measurements were carried out, with the help of a diagrammatic scale during the 2023/2024 cycle. The experimental design was random blocks (BDA), with eighteen treatments, being seventeen graft holders, ‘Barrier’, ‘Cadaman@’. ‘G × N.9’, ‘Capdeboscq’, ‘Genovesa’, ‘Rigitano’, ‘Clone 15’, ‘Mexico fila 1’, ‘I-67-52-4’, ‘Tsukuba- 1’, ‘Tsukuba-2’, ‘Tsukuba-3’, ‘Okinawa’, ‘Flordaguard’, ‘Nemared’, ‘Ishtara’ and ‘Santa Rosa’; and the self-rooted crown cultivar itself (‘Kampai AR’). Each treatment had three repetitions, within these, four branches were analyzed by repetition. First, the homogeneity of variance was verified with the Bartlett test and the normality of residuals with the Lilliefors test, when the mathematical assumptions are not met, the data were transformed by p(X + 0,5); then an analysis of variance (ANOVA) was performed and finally, the averages grouped with the test of Scott-Knott (p=0.05). It was found that the graft holders influenced the severity of the BLS of cultivar copa BRS kampai. The Capedeboscq, Rigitano and Nemared graft holders reduced the progress of BLS.