Hi friend those look like root aphid,very dangerous for plant life and hard to see it pn early stages. Symptoms are similar with nutrient deficiencies. Ladybugs are natural predators of RA. Neem oil should.help stop aphid from grown on early stages. But if problem is unmanagable Botanigard ES might help u.last solution is transplant.check other pot for RA also as they immigrate. Hope i help