The mites being important pests of stored grains are responsible of both qualitative and quantitive losses in stored grains, as they make direct consumption on human food, animal feed or other products changing the quality of infested products, they can penetrate the hard grains and feed directly on the grain kernels, therefore they destroy their germination power, change the moisture contents of mediums because spoil products by faces, skins moulting, deed bodies and micro organisms, initiating growth and spread mould, secondly, interaction to microorganisms leading to the transfer of mycotoxins production fungi or pathogenic bacteria; Thirdly, production of hazardous compounds among them the allergens are of the highest importance.