Despite heavy reliance on citrus in Oman, especially acid lime, citrus species suffer from a number of disease problems, which include witches' broom disease of lime, Citrus tristeza virus, citrus gummosis
and citrus viroids (Moghal et al.
Citrus gummosis is caused by several Phytophthora species .
Frequent outbreaks of citrus gummosis in Kenyan citrus orchards have been reported, yet the identity and distribution of the Phytophthora species causing the disease are unknown.
The distribution and prevalence of Phytophthora species associated with citrus gummosis in Kenya is shown in Table 1.
22] that the species is one of the most destructive citrus gummosis pathogen and predominates in very important regions of citrus production.
syringae as the main causal agents of citrus gummosis in Kenya.
It is also recommended that the species be subjected to selected Oomycete specific fungicides as an initial step in the identification of effective chemicals for the control of citrus gummosis in Kenya.