Dear Ezzedine, Al-Salamo Alikum

Both are spider mites (Family Tetranychidae). It is a male guarding a female nymph and waiting for her moult for mating. It is better for identification to make slides. Probably it is Eutetranychus orientalis, a common spider mite pest of citrus.

By the way, Iam wandering about mites of Emirates. How many people (acarologists) are out there in the UAE.

I also attached a newly published paper about mites of Emirates. Hope you find it useful.

Best regards,

Mohamed

Here is the paper.

Dear mohamed , wa alikoum essalam

thanks for your answer,just want to tell me what about this????

the same are in central nerve of the plant , just to tell you those citrus trees waren't treated.if you look well , you will see it's(female as you said ) the same in the first picture.

those last one taken today, while the first one was taken yesterday

regards