The Susceptibility of Twelve Grape Cultivars to Meloidogyne Incognita Acrita, Rotylenchulus Reniformis and Tylenchulus Semipenetrans
S. A. Sultan
In this study the susceptibility of 5 American cultivars (Delight, Fiesta, Freedom, Harmony and Ruby), 3 Egyptian cultivars (Baladi, Bez-Alanza, and Fayumi) and 4 Palestinian cultivars (Al-Zeiny, Black-Zeiny, Beitony and Chamey) were tested for the three nematode species. The results indicated that, the twelve grape cultivars were different in their susceptibility to each nematode species. Black-Zeiny and Ruby sustained the highest population densities of all these nematode species, whereas freedom and Harmony cultivars supported the lowest number of all nematode species. Chamey and Zeiny were good hosts of M. incognita; Delight and Fiesta were good for both R. reniformis and T. semipenetrans. Beitony was a good host for both M. incognita and T. semipenetrans but a poor host for R. reniformis Baladi, Bez-Alanza and Fayumi were moderate hosts for all the three nematode species. The results also indicated that some of these cultivars could be considered resistant to all three nematode species (c.v Harmony), or immune to M. incognita but resistant to others (c.v. Freedom) or resistant to M. incognita only c.v. Fiesta).