My understanding was that it was under Nixon. It was banned in 1972. But you are right, there was no legitimate reason to ban it. It was banned simply because Nixon was trying to be nice to left wing wacko-kooks.
It didn't work. Also Millions of people died as a result.
You are correct. DDT was banned by the newly created EPA under Nixon, one more illustration of the corruption of his administration. That liberals went after him tooth and tong speaks to the utter insanity of the Democrat party. He was the progenitor of the Uniparty.