Host reaction of wheat genotypes to Meloidogyne javanica and M. incognita

Meloidogyne javanica and M. incognita are the most common nematode species belonging to the genus Meloidogyne that cause extensive losses in crop yield. One of the main management strategies is the use of resistant cultivars. However, limited data are available regarding the reaction of the genotypes to these nematodes. Hence, this work intended to evaluate the host reaction of wheat genotypes to M. javanica and M. incognita . For M. javanica , 26 treatments (genotypes) were evaluated, in which 24 included the wheat genotypes and two the susceptibility controls. Four trials were conducted adopting the completely randomized experimental design with five (Experiments I and II) and six (Experiments III and IV) replicates. For M. incognita , 12 treatments were evaluated, 11 of them were the wheat genotypes, and one was the susceptibility control. Two trials were conducted adopting a completely randomized design with five replicates (Experiments V and VI). The experimental units included 945-mL capacity styrofoam pots, with three plants per pot. The suspensions (Pi) containing the inocula of each nematode species were inoculated into each pot 15 days post seed germination. For M. javanica , the Pi used was 1000 eggs and J2 per plant. For M. incognita , 2000 eggs and J2 were inoculated per plant. All genotypes evaluated were classified as susceptible to M. javanica , except TBIO Sossego, which exhibited a resistant reaction to this nematode. For M. incognita , all genotypes were classified as susceptible. The cultivation of wheat should not be recommended in areas infested with root-knot nematodes.