Systemic Granules for Pest Control?

Hello,
I just joined the forum last week. I received some information from members 
that crickets were eating some of my transplanted iris rhizomes, and so the 
next day I bought a pesticide dust and applied it. No more damage has been 
noticed since then, until today--as the result of massive amounts of rain in the 
past week having pretty much washed all the dust away by this point. 

I work at our local community college, and we have a program in horticulture, 
so I decided to write the department chair and see what he thought about my 
treatment. He told me that I might wish to go to any store such as Lowes or 
Home Depot and look for "systemic granules" --there are, he says, several 
varieties. He said that the Sevin (dust) would keep off the big crickets, but that 
the granules would, once absorbed through the plant's root system and into the 
rhizomes, kill any grubs and quite possibly, also, make the rhizome itself 
poisonous or highly disagreeable to  adult pests. 

So I am wondering if any of you are familiar with such treatment and if, in 
your experience, it has worked for you.

Thanks,
Mike in Myrtle Beach (where we are praying that Frances won't be our third 
tropical system in a month!)

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