Resumo

TORRES, E.C  e  HERNANDEZ, J.F.. Actividad acaricida de Bacillus thuringiensis sobre el acaro rojo de las aves, Dermanyssus gallinae. Rev. vet. [online]. 2018, vol.29, n.2, pp.128-132. ISSN 1669-6840.  http://dx.doi.org/10.30972/vet.2923278.

The poultry red mite, Dermanyssus gallinae, is considered as a limiting factor in poultry production. In this study we evaluated the effect of Bacillus thuringiensis var. Kurstaki (Btk) on larvae of poultry red mite. The contact bioassay method on larvae of D. gallinae per experimental unit was used. The assessed concentrations of Btk were: 15, 25, 35 and 45 mg/ml. Observations were made every 24 hours for 7 days. A moderate mortality of D. gallinae was observed from day 2 of application (66%), which increased up to 78% at 7 days at a concentration of 35 mg/ml. Tukey's mean (95% confidence) did not show significant differences (p≥0.05) between the mortality of D. gallinae nymphs produced by the concentrations 25, 35 and 45 mg/ml, while concentrations of 0 and 15 mg/ml did have a killing effect. A LC50 of 17.8 mg/ml was determined. Btk caused damage on the cuticle of D. galllinae and loss of mobility of the poultry red mite in a period of 24 hours. Btk may be considered as an alternative control method to chemical acaricides for the control of D. gallinae in integrated management programs.

Palavras-chave : hen; biology control; mite; chicken mite; bioassay.

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