Systemic pesticides are in the plant, not on it. When we make the plant itself poisonous to predators, one has to wonder what (or who) else it’s poisoning.
A garden seed company recently sent us these seeds for a new sweet corn. The seeds were treated with Cruiser, which is thiamethoxam, a systemic neonicotinoid insecticide. They were also treated with four fungicides: azoxystrobin, carboxin, fludioxonil and mefenoxam!