I read the entire pesticide label for this product (something everyone needs to do before applying anything) and it appears that you would be fine combining Azamax with a broad range of fertilizers. Like many other insecticides/miticides, it is considered a emulsifiable concentrate or "EC" in the pesticide-world. I suggest doing a jar test first. This is done by getting two glass containers and add the amount of product (Azamax) with nothing but water in the first container. In the second container add both your product and the amount of fertilizer you plan on giving your plant. Agitate both solutions by either stirring or mildly shaking the containers. Wait 5-10 minutes after agitation and inspect the containers. If there are any flakes, globules, layers or any other signs of seperation I would suggest a seperate application. The first container is for comparitive purposes. If they stay in solution and/or suspension (looks like milk) you will be fine. This isn't speculation. This is one of the things I do to make a living (licensed Cat.3).