Laboratory evaluation of six crude plant extracts as repellents against larval Leptotrombidium deliense (Acari: Trombiculidae)

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• 作者：Azima Laili Hanifah ; ^{azima@imr.gov.my} ; Ho Tze Ming ; Vishalani Vishnu Narainasamy ; Ahmad Taufik Yusoff
• 关键词：Laboratory evaluation ; Crude plant extract ; Repellent Leptotrombidium deliense
• 刊名：Asian Pacific Journal of Tropical Biomedicine
• 出版年：2012
• 出版时间：January, 2012
• 年：2012
• 卷：2
• 期：1_supp_S
• 页码：S257-S259
• 全文大小：1K

文摘

Objecive

To examine the repellency of crude plant extracts of onion (Allium cepa var. aggregatum (A. cepa)), garlic (Allium sativum (A. sativum)), clove (Syzygium aromaticum (S. aromaticum)), cinnamon (Cinnamomum zeylanicum (C. zeylanicum)), ginger (Zingiber officinale (Z. officinale)) and pandanus (Pandanus amaryllifolious (P. amaryllifolious)) on larval Leptotrombidium deliense (L. deliense).

Methods

The repellency assay used is a modification of the technique developed by Azima. Extracts at different concentrations (10 % , 5 % , 2.5 % , 1 % , 0.1 % , and 0.01 % ) were evaluated.

Results

All extracts except that from ginger had similar repellencies ranging between 80 % -96 % at 10 % concentration. At the lowest concentration (0.01 % ), onion extract gave the highest repellency (30 % ) followed by clove and cinnamon (23 % ).

Conclusion

Generally, the plant extracts showed various degrees of repellency against the larval mites and the repellency increased with increasing concentrations of the extracts.