Anyone out there have any experience with Kontos for root aphid infestation? Wondering how well it works, what dosages it's being used at, and how it effects the plants? Been using orthene with success but it messes the plants up bad for over a month. They get very yellow and sickly looking and just don't grow for awhile. My last orthene treatment kept em away for a few months but they are back again already... really don't want to deal with unhealthy plants again if I can help it.