TY - JOUR
T1 - Larvicidal activity of micronized aqueous suspension of calcium hydroxide against Aedes aegypti and Culex quinquefasciatus (Diptera: Culicidae)
AU - Estrada-Aguilar, Armando
AU - Sánchez-Manzano, Rosa M.
AU - Martínez-Ibarra, José A.
AU - Camacho, Alejandro D.
AU - Márquez-Navarro, Adrián
AU - Nogueda-Torres, Benjamín
PY - 2012/3
Y1 - 2012/3
N2 - In the search of alternatives for the control of mosquitoes of medical importance, we evaluated the larvicidal activity of micronized suspensions of calcium hydroxide [Ca (OH)2] against Aedes aegypti and Culex quinquefasciatus. Tests conducted under laboratory conditions determined a LC 50=0.027% (LC90=0.096%) for A. aegypti and a LC 50=0.092% (LC90=0.2%) for C. quinquefasciatus, at 24 h post-treatment. Considering that the LC 50 for the less susceptible species killed 100% of larvae for both species at 48 h post-treatment, we decided to use the diagnostic concentration of 0.1% which eliminated 100% of larvae at 48 h under a simulated field trial. There was a residual effect for up to 84 and 70 days for A. aegypti and C. quinquefasciatus, respectively. Evaluation of Ca(OH) 2on breeding sites showed a larvicidal activity of 100% for up to 56 days. When the micronized Ca(OH) 2was incorporated at concentrations from 0.02% (w/v), a superficial film was formed which killed 100% of the larvae of both species after 24 h of contact, and the activity remains until the film broke apart due to stirring. The fact that Ca(OH) 2is cheap and the people in rural areas of Mexico and other countries know the handling procedures for this compound led us to consider that 0.1% suspensions of Ca(OH) 2 could be used for mosquito control in deposits of water placed in human premises both in urban and rural areas.
AB - In the search of alternatives for the control of mosquitoes of medical importance, we evaluated the larvicidal activity of micronized suspensions of calcium hydroxide [Ca (OH)2] against Aedes aegypti and Culex quinquefasciatus. Tests conducted under laboratory conditions determined a LC 50=0.027% (LC90=0.096%) for A. aegypti and a LC 50=0.092% (LC90=0.2%) for C. quinquefasciatus, at 24 h post-treatment. Considering that the LC 50 for the less susceptible species killed 100% of larvae for both species at 48 h post-treatment, we decided to use the diagnostic concentration of 0.1% which eliminated 100% of larvae at 48 h under a simulated field trial. There was a residual effect for up to 84 and 70 days for A. aegypti and C. quinquefasciatus, respectively. Evaluation of Ca(OH) 2on breeding sites showed a larvicidal activity of 100% for up to 56 days. When the micronized Ca(OH) 2was incorporated at concentrations from 0.02% (w/v), a superficial film was formed which killed 100% of the larvae of both species after 24 h of contact, and the activity remains until the film broke apart due to stirring. The fact that Ca(OH) 2is cheap and the people in rural areas of Mexico and other countries know the handling procedures for this compound led us to consider that 0.1% suspensions of Ca(OH) 2 could be used for mosquito control in deposits of water placed in human premises both in urban and rural areas.
UR - http://www.scopus.com/inward/record.url?scp=84860456158&partnerID=8YFLogxK
U2 - 10.1007/s00436-011-2593-z
DO - 10.1007/s00436-011-2593-z
M3 - Artículo
C2 - 21842380
AN - SCOPUS:84860456158
SN - 0932-0113
VL - 110
SP - 1091
EP - 1095
JO - Parasitology Research
JF - Parasitology Research
IS - 3
ER -
