Summary of science fair's project

My hypothesis was that using natural ways to kill pests is faster and more efficient than using pesticides. My step was: First, cut the garlic into pieces. Then mix the chopped garlic with the water. Next, prepare two containers and put 1or 2 roaches into each container. Then, spray the pesticides into one; spray the garlic solution into the other. Observe which roaches die faster. And then do it again, but do the different amount of garlic solution (two times garlic sprays and three times garlic sprays). My result was after the experiment, the roaches in the pesticide groups died faster than the garlic solution groups. I think the reason why the pesticide was more efficient than the natural solution was because pesticides include many chemicals that are toxic to roaches. Also, a swimming pool of garlic solution can only compare to a little amount of pesticides. My hypothesis was incorrect.