The red palm weevil (RPW) Rhynchophorus fcrrugincus Oliver is an economically important pest of palm in Al-Hassa (Eastern Province of Saudi Arabia). The RPW was noted associated with mites during May--June 2009. Three mite species were found. One of which Aegyptus alhassa n. sp. (Gamasida, Trachyuropodidae) as a parasite collected from eggs, larvae, pupae cocoons and under the elytron of insect adult was described. The second mite species Sejus sp. may feed on fungi or organic debris, while the acarid hypopial stage may feed on dead insects.

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All tested bacteria and plant extracts proved larvicidal activity against third instar larvae of both mosquitoes Culex pipiens and Aedes caspius .Bacillus sphaericus, indigenous strain (dammam) showed higher activity against Cx. pipiens larvae, with LC50 = 0.35x10-7 ppm. Than to Ae. caspius (LC50= 4.5x10-7 ppm) .Bacillus thuringiensis H-14 (Bactimos) has higher toxicity against Ae. caspius, followed by Cx. pipiens (LC50=8.0x10-7 and 1.4x10-6 ppm respectively. Both mosquito larvae were susceptible to all tested native plant extracts,