"Green Acres" was not the place to be when CBS — having been derisively dubbed the “Country Broadcasting System” and “Hillbilly Network” — cancelled the Eddie Albert/Eva Gabor charmer, as well as anything akin to it.

"The Beverly Hillbillies", "Mayberry R.F.D.", "The Jim Nabors Hour", "Hee-Haw" and "Hogan’s Heroes" were among the similar shows sent to the showers. Or as Pat Buttram, who played "Green Acres‘" Mr. Haney, famously put it: “It was the year CBS killed everything with a tree in it.”

https://tvline.com/gallery/tv-shows-cancelled-for-dumb-reasons/#!3/dumb-tv-cancellations-green-acres/

STUPID reason! Not to mention they cancelled Gilligan's Island a couple years before that which was an even bigger TRAVESTY!