LABORATORY AND SEMI-FIELD EVALUATION
OF MOSQUITO DUNKS® AGAINST AEDES AEGYPTI AND AEDES
ALBOPICTUS LARVAE (DIPTERA: CULICIDAE)
Thanyalak Fansiri 1
Usavadee Thavara 2
Apiwat Tawatsin 2
Somporn Krasaesub 3
Ratana Sithiprasasna 1
Affiliations :
1 Department of Entomology, US Army Medical Component, Armed Forces
Research Institute of Medical Sciences, Bangkok;
2 National Institute of Health, Department of Medical Sciences, Ministry
of Public Health, Nonthaburi;
3 Department of Administration, US Army Medical Component, Armed Forces
Research Institute of Medical Sciences, Bangkok, Thailand
Source :
Southeast Asian J Trop Med Public
Health Vol 37 No.1 January 2006: 62-66.
Language :
English
Abstract :
Laboratory bioassays and semi-field
studies were conducted on the efficacy and longevity of Mosquito Dunks®
(7,000 ITU/mg Bti ) in order to determine the concentration-response
relationship and the effectiveness on the potency of the Bti product
against Aedes mosquito species based on the WHO protocol
standard methods and to determine the longevity of release for this
product against Ae. aegypti mosquito larvae in water
storage containers. This bio-potency study with the late 3rd
instar larvae of Ae. aegypti and Ae. albopictus
was carried out according to WHO standard protocols. The six concentrations
of the Bti product used in each test were replicated
4 times with 25 mosquito larvae. Probit analysis was then used to
determine the LC50 and LC95 which was equated
with dosages of 1.02 and 1.86 ppm for Ae. aegypti ;
and 0.39 and 0.84 ppm for Ae. albopictus , which reveals
a potency of 382.95 and 303.74 ITU/mg, respectively. The semi-field
evaluation of this product in 200-liter earthen jars against 3rd
instar larvae of Ae. aegypti showed satisfactory control
of greater than 80% at 11 weeks post-treatment.
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