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Surveying mites associated with guava trees (Psidium guajava L.) at Qalyoubia Governorate, Egypt indicated the occurrence of main five ones (i.e. the eriophyid, Tegolophus guavae (Boczek), the tenuipalpid, Brevipalpus phoenicis (Geijskes), the tetranychid, Tetranychus urticae Koch, the phytoseiid, Amblyseius swirskii A.-H. and the stigmaeid, Agistemus exsertus (Gonzalez)). Other six species were present in low numbers.  The population dynamics of the main ones in relation to weather factors and guava plant phenology were discussed. Populations of T. guavae peaked in mid-Jun. and Oct. as 183.56 and 172.94 motile stages/leaf, respectively. B. phoenicis was observed at high population level in Jun. and Jul. on fruits and leaves, respectively. T. urticae population reached a peak in Jun. T. guavae preferred the east side of the tree. Field results showed significant relation between mite's population and temperature increase while the relation with relative humidity was not significant. The dynamics of the phytophagous mites' population density (as second trophic level) seemed to follow the plant phenology (specially the leaves expected nutrient vale). The dynamics of the predacious mites (as third trophic level) seemed to follow their prey dynamics with lag of time. T. guavae population was more significantly on upper tree level than middle followed by the lower one. Younger leaves and lower surface were preferred to this mite than older ones and upper surface.