Larvicidal efficacy of monoterpenes against the larvae of Anopheles gambiae

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• 作者：Eliningaya J. Kweka¹ ; ² ; ^{pat.kweka@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Tamires Cardoso Lima³ ; Chrian M. Marciale¹ ; Damiã ; o Pergentino de Sousa³ ; ⁴
• 关键词：Larvicidal activity ; Malaria ; Anopheles gambiae s.s. ; Essential oils ; Monoterpenes ; Natural products ; Mosquito
• 刊名：Asian Pacific Journal of Tropical Biomedicine
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：6
• 期：4
• 页码：290-294
• 全文大小：388 K

文摘

To evaluate the larvicidal efficacy of eight volatile components of essential oils against 3rd instar larvae of Anopheles gambiae s.s.

Methods

Larvicidal effects of each compound were evaluated in both laboratory and semi-field trials. Stock solution was prepared and serial dilutions were made in six concentrations for each compound. A total of 20 larvae were exposed to larvicides for each replicate and monitored at intervals of 12, 24, 48 and 72 h. Larvae monitoring was done on basis of dead and live larvae in all intervals.

Results

All assayed compounds were larvicides and presented varying degrees of larval toxicity, with LC₅₀ values ranging from 1.28 to 1 938.92 mg/L depending on the treatment time (12, 24, 48 or 72 h). (−)-Perillyl alcohol presented the strongest larvicidal activity towards Anopheles gambiae larvae, with LC₅₀ values of 73.60, 18.36, 1.72 and 1.28 mg/L after 12, 24, 48 and 72 h of exposure, respectively. The next strongest were (−)-isopulegol (LC₅₀ = 135.10, 49.39, 34.39 and 20.22 mg/L) and (−)-carvone epoxide (LC₅₀ = 168.86, 124.74, 80.84 and 23.46 mg/L). After 12, 24 and 48 h of treatment, hydroxydihydrocarvone was the least toxic compound, with LC₅₀ values of 1 938.92, 1 172.18 and 401.03 mg/L, respectively.

Conclusions

The data obtained in this study suggest that all evaluated monoterpenes, especially (−)-perillyl alcohol, have remarkable larvicidal effects and may be considered as potential sources for the development of suitable natural larvicides for mosquito management programs. Further small-scale field trials should be conducted.