I would suggest Capulator's tri-pack as it would not only get rid of these root critters, but it also has other uses, like helping to grow a healthy strong root mass.....you want to try and avoid a "systemic" type product unless you absolutely have to, kinda a last resort type thing..... the stuff in Capulator's packs is a better way to go, its more effective and best of all it is a much more "natural" approach letting mother nature do what she does.....
Below is a excerpt from a article written about the dangers of systemic type products.....
Most pesticides type products are ‘residual’; that is, they cling to the surface of a plant and remain active for a certain amount of time. A approved naturally occurring soil organism that’s deadly to caterpillar pests—is a good example. You spray it on a plant being eaten by caterpillars and the caterpillars currently feeding on the sprayed leaves die, and so do any new ones that show up to feed for a while. How long that ‘while’ lasts depends on variables like temperature, rain, and sunlight.
‘Systemic’ products and pesticides are taken up inside the plant, typically through the root system, so that every part of the plant then contains the chemical. (I say ‘chemical’ here because I can’t think of any organic systemics.) As you can imagine, systemics on food crops are an especially bad idea. In fact, in one of their very first uses, the string beans they were “protecting” became as poisonous to people as the attacking bean beetles.
When most people understand what a "systemic" type product is, they usually do not want to use it anymore.....the problem then becomes finding out which products we use are "systemic" by design......this is a problem! Most folks do not know for example that SM-90 is a systemic product and they use it regularly without thought or care....