Citrus orchards in the Nile Delta and middle Egypt were surveyed for predacious soil mites and parasitic nematodes. There were 16 species of predacious mites and the citrus parasitic nematode, Tylenchulus semipenetrans Cobb. was recorded everywhere. In the medium-heavy soil of the Nile Delta orchards, the general predators or decomposer mites like uropodids were most common. In the light-medium soil of El-Fayoum in middle Egypt, the specialized predator mites like gamasids were most common. In localities where gamasids were common, negligible infestations of citrus parasitic nematodes were reported. Regarding Egypt as a whole, the uropodid mites Uroobovella krantzi (Zaher & Afifi) and Nenteria hypotrichus (El-Borolossy & El-Banhawy) represented about 50% of the sampled mites. The remaining mites were represented by 14 mesostigmatid species, the most common being Gamasiphis pulchellus (Berlese). At least 6% of orchards suffered injurious nematode infestations, 13% critical infestations and 22% moderate infestations, and the remaining 59% were free or with negligible infestations.
