Kontos will take care of Both Root Aphids and Fungus Gnats
Good to know. I never tried Kontos (it is a systemic only--no contact capabilities), but I do know has a very very short half-life and degrades quickly in soil (which is GOOD!).
Kontos (Spirotetramat) has a half-life of less than one day in soil (just like pyrethrin). Imid (contact & systemic) has a 200-600 day half-life and Orthene (contact & systemic) is around 6 days or so (and causes no harm to the microherd). Many synthetic pyrethrin products have a half-life than number in the hundreds of days....no bueno!
BTW, back in the day when I was battling Root Aphids...I did discover an interesting correlation: What ever killed Root Aphids--also killed Fungus Gnats. Makes sense, both are soil dwellers that feed on roots.
Nothing like having a pesticide that is a "two-fer"--Root Aphids & Fungus Gnats.
Cheers!