I trying to decide whether the effort to get certified to put down weed control and grub control is worth it; I'm looking at less than 30 clients. I'm in Indiana and it seems I need the 3B type, and maybe more. What do I need? I got a packet from the state chemist, but there is contradictory information, both in what they sent me and what I was told on the phone. For example, there is reference to certification required for all tank-mixed applications, yet another reference says all types. I don't know what effort is required for being able to legally apply dry products (fertilizer, weed control, grub control), but the effort to apply it is minimal. Also, what are the implications with Round-Up (or similar product) in a pump sprayer for spot use? Of course, all of this is fee-based. Any insight/advice is appreciated.