Rea？？o de genótipos de nectarina (Prunus persica var. nucipersica) à ferrugem da folha, ao chumbinho e evolu？？o da desfolha

genetic resistance to disease can be seen as progress in the production of all crops, and sources of resistance have to be reported, thus helping improvement programs. this study aimed to evaluate the resistance of nectarine genotypes to leaf rust and shot hole, as well as to correlate the severity of the diseases with premature defoliation. three genotypes of the nectarine were evaluated in a randomized block design with ten replications. based on the results, the genotype bruna proved resistant to shot hole and susceptible to leaf rust, while the genotype sunripe was resistant to leaf rust. fla 9-15n was moderately susceptible to leaf rust. there was correlation between leaf-rust severity and defoliation only.