Evaluation of damage Caused by Olive Psylla Euphyllura straminea Loginova
(Homoptera: Aphalaridae) in Syria.

By:⁽¹⁾ Abou-Kaf, N. and ⁽²⁾ O. Hamoudi

⁽¹⁾  Department of plant protection, Faculty of Agriculture, University of Tishreen, P.O Box 1446, Lattakia, Syria.
⁽²⁾  Agricultural Research Center in Lattakia (Bouka), Agricultural Research Department in Syria
It was puplished in Arab Journal of Plant Protection, Volume 17, Issue 2. December 1999.

Abstract

This research was conducted to evaluate the damage caused by olive psylla varieties: "Surani", "Khalkhalie" and "Khuderi" in three Syrian provinces: Idleb, Tartus and Lattakia (Jableh). The effects of olive psylla on flower set and on the average number of flowers per clusters were significant, and most damage was caused by the 4th and 5th instar nymphs. The actual loss of flower clusters was 33.25 % (16 olive fruits, per 100 remained clusters, when the average number of nymph was 6.61 per cluster). This study showed obvious differences among the three olive varieties in the three locations studied, based on the correlation coefficient between the percentage loss of flower clusters and the average number of nymphs per cluster. The correlation coefficient between the number of olive fruits per 100 remained clusters and the number of nymphs per cluster was also determined.

Key words: Olive (Olea europea), Olive psylla (Euphyllura straminea), damage evaluation, Syria