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E-mail: Marwa.samir@yahoo.com Abstract: The aim of this study was to assess the effect of herbicide, acetochlor on population of soil orbited mites in soil and residues of Acetochlor in soil after application. The experiment was carried out at a private farm at Diarb Nagim district, Sharkia Governorate during summer seasons 2018 and 2019,respectively. Where acetochlor (Harness 84% EC) was applied to the soil surface of rate1L/fed. For controlling of annual weeds. The percent reduction of oribatid mites numbers were 8.6, 30.67, 61.6, 50.98, 31.75, 18.55 and 12% after 1, 5, 10, 15, 20, 25 and 30 days in summer season 2018. In summer season 2019, reduction percentages reached 0.17, 20.22, 52, 40.59, 24.12, 4.86 and 4.05% after 1,5,10, 15, 20, 25 and 30 days. Dissipation % recorded gradually increasing by time. The residues of acetochlor in soil recorded 0.058 ,0.05, 0.038, 0.030, 0.016, 0.012 and 0.009 ppm after 1hr., 5, 10, 15, 20, 25 and 30 days, respectively The effect of the herbicide residue was observed on collected soil mites with Berlese funnels showed that acetochlor herbicide has played a great role in decreasing the activity of oribatida group. Our result indicated that acetochlor herbicide reduced population of oribatid mites group, which collected with Berlese funnel after application of acetochlor in corn system for a period of 30 days through 2018 and 2019 . This reduction may be as a result of less food availability (e.g. plant roots) and decreased green plant cover .

Effect of herbicide , Acetochlor on population of oribatid mites (Cyrptostigmata) and its residues in soil