Combination of carvacrol and thymol against the poultry red mite (Dermanyssus gallinae)
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- 作者：Farzam Masoumi ; Mohammad Reza Youssefi…
- 关键词：Dermanyssus gallinae ; Carvacrol ; Thymol ; Combination ; Repellent ; Residual toxicity
- 刊名：Parasitology Research
- 出版年：2016
- 出版时间：November 2016
- 年：2016
- 卷：115
- 期：11
- 页码：4239-4243
- 全文大小：323 KB
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Biomedicine
Medical Microbiology
Microbiology
Immunology - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-1955
- 卷排序：115
文摘
Pest management by conventional pesticides has become progressively hindered by developing pest resistance and increase in consumers demand for safe and residue-free foodstuffs. This will create a considerable market opportunity for alternative products, including botanical pesticides. The present study was conducted to assess the combination of carvacrol and thymol, their repellent activity, and residual toxicity against Dermanyssus gallinae with the aim of designing a new strategy relying on natural compounds for the control of D. gallinae. Different ratios of carvacrol-thymol, 5:0, 4:1, 3:2, 2:3, 1:4, and 0:5 based on LD50 values, were tested for their toxicity on D. gallinae. For residual toxicity assay, mortality rate of mites recorded after being exposed to the surfaces 1, 3, 7, 14, 21, and 28 days post spraying by carvacrol-thymol preparation. In combination toxicity, carvacrol-thymol in 4:1 ratio showed the highest efficacy against D. gallinae. The highest repellent activity was observed in carvacrol-thymol 5:0 combination. Addition of thymol to carvacrol resulted in a decrease in repellent activity of carvacrol as was seen in carvacrol-thymol 3:2, 2:3, and 1:4 ratios (p < 0.05). Carvacrol-thymol in 4:1 ratio at 2 % concentration displayed good residual toxicity and was effective against D. gallinae till 14 days post spraying (p < 0.05). The present study showed that the combination of carvacrol-thymol particularly with a 4:1 ratio displayed improved acaricidal activity and good residual toxicity. However, combining the application of carvacrol and thymol did not show any synergistic effect on repellent activity. Overall, carvacrol-thymol can be suggested as an alternative strategy for the control of D. gallinae.