CULT: Merit grub control

Hi folks!

I just found a clump of iris that are infested with very small iris borer larvae that range in size from 1/4 inch to 1/2 inch. The worms are just now starting to move down into the rhizomes, but most of them are still in the leaves. Is it too late to treat this clump with Merit or some other form of imidacloprid? Would digging this clump and soaking the rhizomes in a solution of imidacloprid kill the borers in the leaves and rhizomes?

Thanks!
Janet in Denmark WI
zone 3-4
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