New Disease Reports

Figure 1 Figure 2 Citrus fruits are traditional agricultural products in Egypt. Citrus volkameriana is the best rootstock for growing citrus in Egypt’s desert areas (newly reclaimed land). It is far superior to other rootstocks used in Egypt in its resistance to Citrus tristeza virus as well as its tolerance to drought. Constraints to fruit production are mainly related to tree decline caused by infection with viroids (Hadidi et al., 2003). Citrus variants of Hop stunt viroid (HSVd) with the pathogenicity determinants of cachexia have been reported associated with gummy bark disease affecting sweet orange in Egypt (Sofy et al., 2010).