Abstract
This study was conducted to know the effect of alcoholic extract of Salix acmophylla leave in some biological aspects of mosquitoe Culex pipiens molestus, three concentration have been use 500, 600 and 700 Mg mL-1 for Salix acmophylla to determinate the lethal concentration for half number of 4th instar larvae LC50, the effect in the life of the insect, the time of growth of every stages, Adults longevity and mortality. The results showed that the LC50 of 4th instar larvae was 600 Mg mL-1 Salix acmophylla ,the longest time of the insect growth was concentration 700 Mg mL-1 21.5 days. There was a significant increasing in larval duration at the some concentration for Salix acmophylla, but have no significant effect for the time of the growth of pupal phase, the highest level of the death larvae in the accumulated effect 41.66% at concentration 700 Mg mL-1, on the mortality percentage adult at concentration 700 Mg mL-1 100%, there was a congenital relation between concentration and mortality percentage
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