A note on Longidorus and xiphinema species from Sudan


  • A. M. Yassin


Longidorus and Xiphinema have assumed increasing importance in recent years in many parts of the world. Many species have been shown to be vectors of viruses causing diseases of economic importance in many crops in the USA and Europe, and there is increasing evidence of the importance of many species causing direct damage by their feeding. Most species in both genera have long life cycles and individuals are able to exist for long periods in the soil, even without host plants. This ecological trait, together with their wide host range and extensive climatic adaptations, explains their cosmopolitan occurrence. In the Sudan, at least three species of each genus are known to occur, having been recovered from around the roots of various field and orchard crop plants (Yassin et ai., 1970). Some aspect of the distribution, biology and pathogenicity of the species are described here.