I use natural predatory bugs, such as lady bugs,lace wings, nematodes,prying mantis. I am into my 3rd year and planning my 4th. bugs can be a huge problem if you don't have enough good bugs to help combat the bad bugs.Poisons only work so long and then you must add more. same with commercial fertilizers they only work so long before you must add more. But I have found that when you use natural things they multiply on their own and you don't have to keep adding more and more and more to get the same effect.