Hayk from Los Angeles California writes
Criterion 75 WSP is not labeled to control root aphids specifically, and most products on the market do not list them as a target pest. Often customers need to use a pyrethrin product for a contact kill and drench the roots and soil to control any that are present. Criterion is also only labeled for use in interior plantscapes and is not for use in a greenhouse. AzaGuard Insecticide is a great option that is labeled for root aphids as well as indoor greenhouses.
Answer last updated on: 12/02/2020