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The present study was carried out to evaluate the effect of plant essential oils on Dermanyssus gallinae (D. gallinae). In vitro six groups of red mites, 20 mites in each group were exposed to direct spray of combined plant essential oils (Alisal) in rate of 0.25% on mites. activity and changes under stereomicroscope showed that sprayed mites completely stopped movements at both 1and 2h after treatment with completely stretched legs and white bead-like spots of oils accumulation on legs and bodies at 1and 2h. while, the non-treated mites were active with pale light brown colour. In vivo effect of Allisal to control red mite infestation in laying hens was investigated. In case of drinking water method mite count reduction rate on the bird was 60 %, 10%, and 0% as well as 0%, 0% and 10% in their traps at 4,7, and 12 days respectively, from the start of treatment in drinking water. While, in spray method mite reduction was 40%, 20%, and 10% on birds and 0%, 0% and 30% in the traps. On the other hand, water intake, feed intake, general health condition, skin health, and feather condition scores were improved at 4 day post treatment (DPT). Total lesion score at 12 DPT was improved. The present study concluded that in vitro combined plant essential oils have rapid and strong acaricide effect in contact sprays. In vivo, there was obvious improvement in groups treated with plant oils than non-treated group. Drinking water treated birds showed good results than spray treated group. Therefore, it is recommended to use combined plant essential oils in D. gallinae control strategies in poultry.

Effect of Combined Plant Essential Oils on Dermanyssus gallinae: In vitro and in vivo study