Abstract
The bioasasy experiments were carried out with pyrethrum alone and the pyrethrum synergised with piperonyl butoxide, MGK-264 and a mixture of both the synergists. The median response concentrations calculated and the regression lines drawn, indicate that MGK-264 is slightly inferior to piperonyl butoxide as pyrethrum synergist, but if the cost of MGK-264 is taken into consideraiton, it appears to be more economical than piperonyl butoxide. A mixture of piperonyl butoxide and MGK-264 appears to be a better synergist on being mixed with pyrethrum and the mixture may be prepared at a saving cost, because of the lower cost of MGK-264.
