Four new grape hybrids resistant to Meloidogyne javanica

Abstract

Root-knotting nematodes are found in vineyards and are associated with grapevine decline. This study aimed to evaluate the resistance of four new hybrids, obtained by crossing Vits labruscana and Vits rotundifolia (IBRE 421, IBBT 481, IBRK 504 and IBMG 631), to Meloidogyne javanica. This study also evaluated three rootstocks (IAC 766, Paulsen 1103, VR 043- 43), widely used and showing resistance levels to M. javanica. The plants were obtained from cuttings, then grown in pots, and inoculated with a population of M. javanica. One year after inoculation, the plants presented no galls on their fine roots. The root nematodes were extracted and quantified. The reproduction factor of M. javanica in all genotypes was close to zero. The tested hybrids are not good hosts for the multiplication of M. javanica. Thus, these new hybrids can be used as a genetic control strategy of M. javanica.

Keywords

• Vitis labruscana
• Vitis rotundifolia
• root-knot nematode