Resistance of peach and plum rootstocks from Spain, France, and Italy to root-knot nematode Meloidogyne javanica

Two trials involving 20 Prunus rootstocks were conducted under greenhouse c onditions to screen for resistance to root-knot nematode [Meloidogyne javan ica (Treub.) Chitwood], Many of the tested materials are interspecific hybr id rootstocks and represent new commercial peach (P. persica Batsch) and pl um (Prunus sp.) releases or experimental genotypes of Spanish, French, and Italian origin. In the first trial, the rootstocks Adesoto 101 (P. insititi a L.), Bruce (P. salicina Lindl. x P. angustifolia Marsh.), Ishtara, AC-952 (P. insititia), Garnem [P. dulcis (Mill.) D.A. Webb x P. persica], Cadaman [P. persica x P. davidiana (Carr.) Franch], and Orotava (P. salicina) were immune or resistant to a mixture of 10 isolates of M. javanica. The remain ing rootstocks, Myrocal (P. cerasifera Ehr.), Montclar (P. persica), and Ad afuel (P. dulcis x P. persica), were susceptible. In the second screening t rial, the plum rootstocks Adesoto 101, Adara (P. cerasifera), Myro-10 (P. c erasifera), Constanti (P. domestica L.), and AD 105 (P. insititia) were imm une to the root-knot nematode. Cadaman, G x N No. 17 (P. dulcis x P. persic a), and Tetra (P. domestica) were resistant. Laroda F1OP (P. salicina), Myr o-almond (P. cerasifera x P. dulcis), and the peach-almond hybrids Mayor, A dafuel, and Sirio were susceptible.