A study was conducted during two periods (March and September), for two successive growing seasons (2016 and 2017) to determine the impacts of three bio-pesticides products namely, abamectin (Tervigo^®), azadirachtin (Achook^®) and a mixture of Trichoderma album + Bacillus megaterium (Bio Zeid^® + Bio Arc^®), as well as oxamyl (Vydate^®), on the number of citrus nematode populations (Tylenchulus semipenetrans), on 10-year-old Washington navel orange trees (Citrus sinensis, Osbeck) budded on sour orange rootstock grown in sandy soil. This work was carried out in private farm located at Hamour village, Boustan area, Behera governorate. The obtained results proved that all treatments reduced nematode populations during both seasons from 63.04 to 79.66% and from 69.53 to 89.87%, respectively. Meanwhile, the fruit yield during both seasons was increased significantly with all applied treatments, especially oxamyl treatment. The most of physical fruit properties were improved. Chemical fruit properties were markedly improved, especially
with abamectin treatment which increased vitamin C. Moreover, oxamyl and azadirachtin significantly raised total solid soluble content in the fruit juice.
On the other hand, the leaf area was augmented through both seasons in all treatments. The leaf minerals composition also was increased with all applied treatments, except for calcium which significantly decreased with the mixture of T. album + B. megaterium during both seasons of study.