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1 January 2012 Enhanced Toxicity of Binary Mixtures of Larvicidal Constituents from Asarum heterotropoides Root to Culex pipiens pollens (Diptera: Culicidae)
Haribalan Perumalsamy, Jun-Ran Kim, Soon-Il Kim, Hyung Wook Kwon, Young-Joon Ahn
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Abstract

The toxicity of pellitorine alone or in combination with (-)-asarinin, α-asarone, methyleugenol, or pentadecane (1:1, 1:2, 1:3, 2:1, and 3:1 ratios) to third instars from an insecticide-susceptible KS-CP strain and -resistant DJ-CP colony of Culex pipiens pallens Coquillett was evaluated using a direct-contact mortality bioassay. The binary mixture of pellitorine and (-)-asarinin (3:1 ratio) was significantly more toxic against KS-CP larvae (0.95 mg/liter) and DJ-CP larvae (1.07 mg/liter) than either pellitorine (2.08 mg/liter for KS-CP and 2.33 mg/liter for DJ-CP) or (-)-asarinin (11.45 and 12.61 mg/liter) alone. The toxicity of the other binary mixtures (1:1, 1:2, 1:3, and 2:1 ratios) and pellitorine did not differ significantly from each other. Based on the co-toxicity coefficient (CC) and synergistic factor (SF), the three binary mixtures (1:3, 2:1, and 3:1) operated synergistically (CC, 250–390 and SF, 1.4–2.2 for KS-CP; CC, 257–279 and SF, 1.1–2.1 for DJ-CP). The binary mixtures of pellitorine and (-)-asarinin merit further study as potential larvicides for the control of insecticide-resistant mosquito populations.

© 2012 Entomological Society of America
Haribalan Perumalsamy, Jun-Ran Kim, Soon-Il Kim, Hyung Wook Kwon, and Young-Joon Ahn "Enhanced Toxicity of Binary Mixtures of Larvicidal Constituents from Asarum heterotropoides Root to Culex pipiens pollens (Diptera: Culicidae)," Journal of Medical Entomology 49(1), 107-111, (1 January 2012). https://doi.org/10.1603/ME11092
Received: 29 April 2011; Accepted: 1 September 2011; Published: 1 January 2012
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