Efficacy of spinosad against the poultry red mite, Dermanyssus gallinae (Mesostigmata: Dermanyssidae), in laboratory and field trials*

摘要: The poultry red mite, Dermanyssus gallinae (De Geer), is the most economically important ectoparasite in houses many countries around world. lack of efficacy commercial products its control results from poor application and/or resistance to active ingredients. A new insecticide, spinosad, was tested against mobile stages mite laboratory and field populations. Laboratory trials showed increasing five days (adults) six (nymphs) after exposure. were confirmed a trial conducted under conditions. three separate on farms with high natural first second sprayed concentrations 2,000 4,000 ppm spinosad (2 4 g/L), whereas third house used as an untreated control. Spraying using sprayer (Stadikopumpe VAAR 252- 200 LE, Dinklage, Germany) L reservoir permanent stirring, 50 m long flexible tube double jet system, size 0.08 mm. pressure 6–10 bar. Sampling immediately before once week for 56 93 second. In house, almost 100% reduction numbers observed until 28 post treatment; 74.3% 49 treatment. rates higher than 90% day 77. maintained infestations throughout experimental period. effective all D. spinosad.