مرض ذبول الزيتون في وسط و شمال سورية و أثر عوامل الصنف و العمر و بعض العمليات الزراعية في انتشاره و تطوره

الملخص EN

Verticillium dahliae kleb.

affects olive orchards in middle and northern Syria.

Disease survey carried out during spring and summer of 1988-89-90 in Hama, Homs, Aleppo and Idleb provinces revealed that the percentage of infection in these provinces were 4.40, 3.65, 3.80 and 4.51, respectively.

The disease was found to affect olive trees in all ages, but young trees were more susceptible.

Isolation of the pathogen was possible all year around, but was more frequent during summer.

The reaction of 10 local varieties to the disease was not the same.

High correlation was found between irrigation and disease incidence.

Percentage of infection in non-irrigated orchards ranged between 3.06 -5.87 % and in irrigated orchards from 15.40 - 34.70 %.

Wilt incidence increased with frequent ploughing.

The percentage of infection was 0.33 % after two ploughings, and reached 16.62 % after 12 ploughings.