"DMR-larval trap" for possible control of Aedes aegypti (L), the pricipal vector of DHF in Yangon

The Department of Medical Research (DMR) has developed a larval/pupal trap with a view to control Aedes (Stegomyia) aegypti (L) effectively and economically. "DMR-larval trap" is a mechanical device and is capable of trapping all stages of larvae and pupae and that the number of aquatic stages trapped is directly proportional to the number of larvae and pupae present in the container-habitat. The trap is also capable of trapping greater number of late stages than the earlier ones which is more favourable from control point of view. It is found to trap about 47.85 per cent of all larvae and pupae within the first 24 hours achieving complete control within 10 days with sustained control thereafter.

Anophiline mosquitoes of Myanmar. 2: Anopheles (Cellia) minimus Theobald, 1901

Anopheles minimus together with Anopheles dirus consitute the primary vectors of malaria in Myanmar. The former has a wider distribution and occurs in higher densities with longer seasonal prevalence and is therefore considered to be the most important malaria vector in the country. Previous studies showed that An.minimus breeds in grassy edges of perennial hill streams, in slow running irrigation channels and terraced rice field while DMR teams, in addition, found it breeding in small puddles in stream beds together with An. maculatus. At Phado, An. minimus was found to constitute 26.2 per cent, 50.5 per cent and 44.1 per cent in monsoon, cool/dry hot/dry seasons respectively.Prevalence of An.minimus in relation to distance from forest was presented. Biting, resting behaviour and host preference studies were carried out and results presented. Man-biting rate and vectorial capicities in relation to rainfall for each month over a year are also presented.

Anopheline mosquitoes of Myanmar. 1: Anopheles (Cellia) dirus Peyton and Harrison, 1979

Results of the study involving distribution, breeding habits, biology under laboratory cinditions, adult bionomics and its relationship to malaria transmission under different ecological condition have been studied and presented. Cytogenetics and iso-enzyme studies to differentiate its sibling species were also presented. Of the sibling species of An.dirus, species D was found to predominate in Myanmar, whereas species A was recorded from Central Burma. Susceptibility of An.dirus to DDT and Bacillus sphaericus was also reported.