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In a field survey, 16 eriophyoid mite species were collected from eight species of fruit trees, among which two species were found to be new record to Egypt. They were Tegolophus guavae (Boczek, 1960) on Psidium guajava L. (Myrtaceae) which causes rust on leaves, and Aceria ziziphi Mohanasundaram, 1990, vagrant without damage on Ziziphus spina-christi Willd (Rhamnaceae). These species were redescribed and illustrated from local material. A total of 65 eriophyoid mite species in superfamily Eriophyoidea has been recorded in Egypt due to literature. These species belong to three families, seven sub families, seven tribes and 27 genera. A list of these species has been constructed and presented herein.

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A new eriophyoid mite species, Heterotergum zaheri sp. nov. from Ziziphus spina-christi (L.) Desf (Rhamnaceae) is described and illustrated. This mite is vagrant in the tender apical shoots (between hairs) and on the lower surface of young leaves. It causes no apparent damage. In addition, a supplementary description of Vittacus bougainvilleae (Keifer, 1959) comb. nov. (transferred from Phyllocoptes), is provided; it is recorded for the first time in Egypt, infesting Bougainvillea glabra Choisy (Nyctaginaceae). Moreover, Aculops guajavae Abou-Awad, Al-Azzazy & Afia, 2016, which causes rust on terminal leaves of Psidium guajava L. (Myrtaceae), is set as a junior synonym of Tegolophus guavae (Boczek, 1960) and redescribed.

Developmental times and reproduction rates of the date palm dust mite Oligonychus afrasiaticus (McG.) were studied on three different date Palm tree parts (i.e. kamry fruit stage (characterized by the green color of fruits), yellow khelal stage and inner frond) of Khalas variety at laboratory conditions of 15, 25 & 35 ± 2°C; 30 & 70 ± 5% R.H. and 16:8 L:D. The mite failed to develop at 15°C. Immatures developmental time was fastest on kamry stage (10.60 days) followed by yellow khelal (12.35 days) then inner fronds (12.71 days). Adult female longevity averaged 15.08, 14.62 and 13.83 days on kamry and khelal yellow stages and inner frond, respectively. The shortest generation time was 9.5, 11.32 and 16.04 days at 35°C & 30% R.H., while the longest was 22.74, 26.74 and 26.68 days at 25°C & 70% R.H. on kamry, yellow khelal stage and inner frond; respectively. Sex ratio was affected by temperature as proportion of females increased with temperature increase. In addition, the values of r m , R 0 and λ increased with temperature increase and decreased with R.H. increase. The mean generation time (T) and generation doubling time (DT) values decreased with temperature increase and R.H. decrease; thus the reproduction of mite increase. This mite favored high temperature and low R.H. Also immature date (kamry stage) was the favorable followed by yellow khelal then inner frond.