العلاقة بين الإصابة بذبابة ثمار الزيتون Bactrocera oleae Rossi والذبابة المفترسة Prolasioptera berlesiana Paoli و مرض تعفن ثمار الزيتون Camarosporium dalmaticum في بستان زيتون في محافظة القنيطرة، سورية

Abstract EN

The study was carried out in an olive orchard in Quneitra governorate, Syria during the fruiting season 2017.

The population of the predatory fly Prolaioptera berlesiana Paoli (Diptera: Cecidomyiidae), the eggs predator of olive fruit fly Bactrocera oleae Rossi (Diptera: Tephritidae) was monitored.

Correlation among the populations of the olive fruit fly B.

oleae, predatory fly P.

berlesiana and olive fruit rot fungus Camarosporium dalmaticum (Dothideomycetes: Botryosphaeriales) on six olive varieties were investigated.

The results showed a difference in the olive variety susceptibility to both flies and the rot fungus.

The Mawi variety was characterized by the lowest population of the predatory fly, olive fruit fly and the fungus (14.15, 8.59 and 4.38/50 fruits, respectively), with a significant difference with Kaysi variety, which showed the highest infestation rate of24.01, 14.49 and 5.45/50 fruits, respectively.

The results showed also that there was a significant positive correlation among the predatory fly, olive fruit fly and fruit rot infection rates.

The estimated linear correlation between infection rate and both predatory flies and fruit flies were: Y = 0.52X + 1.83 (R2 = 0.51) and for predatory fly and fruit rot fungi Y = 2.41X-0.42 (R2 = 0.97).

A number of insect parasitoids was recorded on the olive fruit fly in the studied field.