Rea？？o de porta-enxertos de pessegueiro à Meloidogyne incognita

in order to evaluate the reaction of the peach rootstocks 'okinawa', 'flordaguard', 'nagano wild', and the selection 'ufpel 0402' and 'nr-0080407' to meloidogyne incognita, the plants were inoculated with 10.000 eggs+j2 of m. incognita. seedlings of tomato 'santa cruz' inoculated in the same way were used as control and to determine the inoculum viability. the experiment was carried out under greenhouse conditions in a completely randomized experimental design with five replications, each one performe by a plant. six months after inoculation, the plants were pulled out on the roots and evaluated for the number of galls and reproduction factor (rf). neither gall no nematode reproduction was registered in all rootstock systems, except for 'nagano wild' that shown 36 galls, but without evidences of nematode reproduction. all the tested genotypes were considered immune to this root-knot nematode specie, because they were effective in suppressing the m. incognita reproduction, and may be used as alternative rootstocks in new orchards or as resistance source to genetic improvement of peach rootstock.