I think it is effective at controlling the flies to the point where there is minimal damage to plant, but it is certainly not eliminating them. Perhaps this is a satisfactory result concidering there are no longer curled up leaves or holes in leaves.I am still seeing some of the buggers around, and I do however have to monitor them quite closely to make sure we don't have a WF population explosion. Ron. In a message dated Fri, 28 Jul 2000 9:38:03 PM Eastern Daylight Time, Shantihhh@aol.com writes: << << Lets hope it works on the whiteflies. Ron. >> Ron et all, No noticeable reduction in the population of whiteflies w/savers sprayed on tops and under side sides of leaves. UGH! HELP! Now what? Mary-Anne >>