Inoculation of date palm seedlings with Foa led to disease
symptoms that could be observed after 6–8 days of incubation.
Symptomatic seedlings showed diffused wet necrosis in root
tissues while asymptomatic plants developed a limited necrotic
lesion around the inoculation site. In both cultivars (BSTN and JHL),
seedlings treated with JA developed as in the case of Foa treatment
a limited necrotic lesion around the application site after the first
week of incubation. These lesions were similar to those observed in
Foa resistant seedlings.