Effectiveness and public acceptance of a slow release formulation of Bacillus thuringiensis israelensis (Mosquito Dunks®) in controlling the population density of dengue vectors in Sri Lanka
2021
Aryaprema, Vindhya S. | Xue, Rui-De
A slow release, solid formulation of Bacillus thuringiensis israelensis (Bti)-Mosquito Dunks® was evaluated for its effectiveness in controlling of dengue vectors in Sri Lanka. A small-scale simulation field study showed a high effectiveness of 98–100% mortality at 15 days post-treatment and the mortality rate started to drop down by 30 days post-treatment. The larval density in the large-scale field study showed a progressive drop during the post-treatment period achieving the highest by 30 days (62.5%) and a subsequent increase by 45 days post-treatment, while in the control area showed a continuous increase. Reduction in the mean number of positive breeding places per house among sampling bouts was highly significant (p = 0.016). In the control area, oviposition activity showed a marked reduction 15 days post-treatment (71.4% Ovi-trap index, 82.3% Egg density index) after an initial increase at 8 days post-treatment. Mean number of eggs per trap showed a highly significant difference among the sampling bouts in the test area. Public acceptance of the product was very high (93.3%). A single selective application of the Bti-Mosquito Dunks® when used at recommended dosage is effective in controlling population densities of vectors of dengue approximately up to 30 days.
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