Abstract
The essential oil of Scutellaria barbata was extracted using a steam
distillation and then evaluated via fumigant and contact toxicity bioassays
against Dermatophagoides farinae, Dermatophagoides pteronyssinus, and
Tyrophagus putrescentiae. The acaricidal toxicities of
1-hydroxynaphthalene from S. barbata oil and its derivatives were
determined and compared with those of benzyl benzoate. Based on the
LD50 values of 1-hydroxynaphthalene derivatives against D.
farinae, D. pteronyssinus, and T. putrescentiae, obtained
using a fumigant toxicity bioassay, the acaricidal activity of
1-hydroxynaphthalene (2.11, 2.37, and 4.50 µg/cm2) was 4.76,
6.00, and 2.68 times higher than that of benzyl benzoate (10.05, 9.50, and
12.50 µg/cm2) in the corresponding order, which was followed
by that of 2-hydroxynaphthalene (9.50, 9.00, and 11.50 µg/cm2).
On the contact toxicity bioassay, the acaricidal activity of
1-hydroxynaphthalene (0.79, 0.92, and 2.50 µg/cm2) was 9.49,
6.52, and 3.76 times higher than that of benzyl benzoate (7.50, 6.00, and
9.41 µg/cm2), which was followed by that of
2-hydroxynaphthalene (4.21, 4.80, and 6.50 µg/cm2). In
conclusion, our results indicate that S. barbata oil and
1-hydroxynaphthalene derivatives might be effective natural agents for the
management of house dust and storage mites.
Key words
Dermatophagoides farina
-
Dermatophagoides pteronyssinus
- 1-hydroxynaphthalene - Lamiaceae -
Scutellaria barbata
-
Tyrophagus putrescentiae
