DETERMINE THE PERCENTAGE OF INFASTATION AND SEVERITY BY TWO SPECIES OF ERIOPHYID MITES: Aceria oleae (NALEPA) AND Tegolophus hassani (KEIFER) ON SOME OLIVE TREES CULTIVARS IN BAGHDAD

Abstract

Field Experiment was conducted at Al-Zafarania station /Baghdad Provenance through 2009 to determine the percentage of infastation on some cultivars of olive trees and the severity infection of leaves by two species of Eriophyid mites Olive bud mite Aceria oleae (Nalepa) and Rust bud mite Tegolophus hasani (Keifer). Resultes showed that the percentage of infastation in Nibaly trees and nurseries cultivar were 100% and the severity of infection were 63 and 83% respectively. The percentage of infected leaves in nurseries of cultivars:Khudhiry, Shami, Qissy ,Sorany, AShrasy and Nibaly were 99.16, 94.85, 80.69,74.57,72.22 and 83.32% respectively. The comparison of severity infection between nurseries and young trees of Nibaly cultivar were light in trees (0.44), while it is modrate in nurseries (1.40). The studies cultivars showed a high severity infection on Shami and Khudhiry amounting 2.00 and 2.13 whereas it was modrate in the other cultivars (Qissy, Sorany, Ashrasy and Nibaly) which is successively amounting(1.15,1.23,1.25 and 1.40).The percentage of the infected fruits in cultivatars:Nibaly, Ashrasy and Manznillo were 47.49, 53.04 and 53.19% successively.