The activity of crude plant extracts is often
attributed to the complex mixture of active compounds.
In the preliminary screening, potential larvicidal
activity of plants, different solvents crude extracts of
three plants was noted (Table II, Fig. A, B and C). Five
different solvents were tested against An. subpictus and
Cx. tritaniorhynchus and 100 per cent larval mortality
was observed in the bark methanol extract of A.
squamosa, leaf ethyl acetate and methanol extract of
C. indicum and leaf acetone and ethyl acetate extract
of T. procumbens (Table II).