Samer Ghanem*(1) Mohamed Tawil(1) and Sabah Al-Maghribi(1)
(1). Plant Protection Department, Faculty of Agriculture, Tishreen University, Latakia, Syria.
(*Corresponding author: Eng. Samer Ghanem. E-Mail: samer.gh85@hotmail.com).
Received: 25/02/2018 Accepted: 26/04/2018
Abstract
The development of peacock eye disease on olive trees of Khadairy variety was studied during 2016 and 2017 in five orchards, located at Baksa in Latakia governorate, in order to identify the disease development during these two years. The disease development was observed during spring and autumn compared to summer and winter. The disease incidence was during spring of 2016 (March, and May), also between 20.22 – 24.17% and ranged between 23.34 – 28.19% in 2017. The disease severity ranged between 12.76 and 17.80% in 2016 and ranged between 15.75 and 19.14% in 2017. In autumn, the disease incidence was medium, where it ranged between 13.23 – 20.13% in autumn 2016 (September, October and November) and between 11.09 – 22.72% in the autumn of 2017. While the disease severity was between 6.89 – 12.45% in autumn 2016, and between 5.17 – 14.69% in 2017. The disease incidence was low in summer and winter, where the incidence rate was only 11.19% in summer of 2016 and 10.25% in 2017. The severity did not exceed 5.13% in 2016 and 5.05% in 2017. The incidence did not exceed 16.35% in winter 2016 and 16.07% in 2017. The severity was not more than 7.64% in 2016 and 8.35% in 2017. It was also observed different development of the disease, when comparing the lower part (1-2 m) of the tree with the upper part (2-4 m). The incidence and severity were high at the lower parts, and it was low at the upper parts of the tree over all of the studied traits.
Key words: Khdairy variety of Olive, Peacock eye disease, Spilocaea oleagina, Latakia, Syria.
Full paper in Arabic: PDF