High reproductive power and short development cycle, in addition to other factors, enable D.gallinae to produce adverse effects in the poultry industry. Not all development stages have the same significance, nor are they equally sensitive to the methods and formulations used for D.gallinae control. Laboratory tests were conducted by exposing eggs, larvae and protonymphs to P 547/17 formulation of inert oils (Pulcap). The testing was carried out with 20% oil-in-water emulsion with short exposure (1 min), and with 10%, 20%, 50% and 100% oil-in-water emulsion with continuous exposure. In the first control group, water was used (with continuous exposure), and in the other control group, eggs, larvae and nymphs were not treated. We determined that in all cases, eggs were laid in high percentage (89-100%). In addition to this, in tested liquids, larvae were present in high percentage and they change into protonymphs (8-89%). In the conditions of full exposure, where parasitic stages cannot leave the emulsion, P 547/17 in time achieves complete efficacy on development stages. In short exposure of eggs, when dirt is present, or on absorbent surfaces, P 547/17 emulsion cannot control them. However, this flaw is not essential in practical conditions. When applied correctly, P 547/17 formulation is efficient in D.gallinae control.
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