When I was a kid (mid-late '60s) they sprayed with a contraption that looked like a machine gun turret mounted on a trailer behind a pickup. It had a fan that atomized and boosted the chemical far up into the trees. There was a guy manning the turret and swiveling it all around. The trees would toss around like in a high wind and the stuff went everywhere. Don't know what it was but my kids are normal, physically anyway.

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".