Myanmar Health Sciences Research Journal


Archives   2013

Myanmar   Health   Sciences   Research   Journal

Volume   25,  Number   3

TITLE:   Control of Aedes Larvae in Household Water Storage Containers Using Dragonfly Nymphs in Thakayta Township, Yangon Region.
AUTHOR:   Maung Maung Mya; Ni War Lwin; Saw Mitchell; Bo B0; Maung Maung Gyi
SOURCE:   Myanmar Health Sciences Research Journal. 2013; 25(3): 166-172
ABSTRACT:   A biological control of Aedes aegypti larva in water storage containers using dragonfly nymph was done in randomly selected 50 households in each area- Ward 7 (East) as test and Aung Thitsa ward as control areas in Thakayta Township from January 2009 to October 2010. Aedes larvae positivity in water storage containers was investigated and recorded. Household Index (HI), Container Index (CI), Breteau Index (BI), Pupae Indices and man biting rate were determined before and alter interventions. In the laboratory, collected dragonfly nymphs and eggs from pond were reared for mass production to be released in water storage containers for field trial and maximum number of larval consuming rate was measured using Anopheles, Culex and Aedes larvae. Laboratory and semi-field results revealed that the longevity of nymphs is between 173±1.6 days to 182±1.5 days in different water storage containers. A medium size (1-1.5cm) dragonfly nymphs (Corcothemis servilia servilia) consumed 129.7±1 Aedes larvae per 24 hours followed by Anopheles larvae. After that, (1-1.5 cm size) 2 dragonfly nymphs per container were put into containers monthly for 3 months. After intervention, HI, CI and BI were significantly reduced from 64%, 25% and 154% to 4%, 1% and 4%, respectively within 3 months (HI X2=59.02, p<0.001; CI, X2=22.4, p<0.001; and BI, 97.4% reduction). Also 100% reductions were found in key containers and key premises in test area of Ward 7(East). Pupae Indices and man biting rate were also significantly reduced from pre-intervention period to post-intervention. Dragonfly nymph can be used effectively as a strong biological agent for the control of Aedes mosquito-borne diseases like DHF.
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