Table 3.

Effect of Callistemon viminalis bark extract on Biomphalaria alexandrina snails (number 30).

Time (day)	Number of snails	10 ppm		20 ppm		40 ppm
		Death	%	Death	%	Death	%
1	30	9	30	12	40	17	56.66
2	30	16	53.3	23	76.7	25	83.3
3	30	20	66.7	30	100	30	100
4	30	25	83.3	30	100	30	100
5	30	28	93.3	30	100	30	100