I want to section off a small part of my pasture.

I have a pony that is getting way too fat off all the pasture grass and way too disrespectful about getting caught. She walks away when I so much as walk into the pasture. I've had this idea for a while that I would section off a small part of our pasture (about the size of a round pen or small corral) that she could stay in. This would be fairly easy, seeing as there is a small square shaped groove that the big pasture has that would be really easy to section off and just make it a smaller square all by itself. I want this to be temporary as well. This would allow me to work with the pony easier, catch her easier, and keep her off all the long grass she's getting fat off of.

So, I'm asking you guys for help on what material to section the pasture off with. I've considered something along the lines of crime scene tape, but apparently that's really flimsy and tearable. I'm looking for something cheap, durable yet temporary, that will work to keep my pony enclosed in a space. If ANYONE could help me, I owe you big time!

Why not set up a temporary electric fence? The step in posts cost around $4 in my area, and electric tape is very reasonably priced as well. I've seen people just string up non-electrified rope and twine, thinking it will keep their horses in. It doesn't. Go with something electric or very sturdy, such as a wooden fence.

I'd really like to stay away from electric if possible...

I hate to say it, but if the pony is disrespectful about being caught, she will probably disrespect any temporary fence you put up, especially if it keeps her away from the "greener grass" (which will be anything outside her enclosure) and if it keeps her away from her buddies (assuming she's with any other horses). Unless you put up something solid, electric is going to probably be the only really effective thing to use. Something temporary may work for a few days, but she'll eventually figure out how to get out of it, and then she'll start testing fences to see what she can get out of. Then the problem just escalates. The only other thing I can think of are corral panels, but they get awfully expensive unless you can borrow some.

You MIGHT be able to use feedlot panels, like these.

Feedlot Panel, Combo, 16 ft. - 3610341 | Tractor Supply Company

But you would still have to put up posts, although t-posts might work.

Electric is the most failsafe method and it won't do her any harm. In fact, it will probably be better for her in the long run as opposed to being potentially tangled in fencing. I've been shocked many times before and I'm perfectly fine. The horse can deal with it too. Even my dogs had to have a string of electric wire placed at the bottom of the fence because they kept digging out and getting into trouble.

She may touch the electric a time or two, but she'll catch on quick that it's a bad idea and then she'll be perfectly fine. That's what happened with the dogs. Actually, the thing hasn't been working for months but they still won't touch that wire.

I have to say, ribbon electric is the way we went when we had to throw up a quick fence, 45 minutes and we were done. We have electric on the new fence as well, to keep certain teeth off of my expensive running boards. Your horse is worth the expense, your horse is not going to be injured by it.
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Our entire farm is in electric. Your pony will do fine in it, and it's vry cheap.

If you are unwilling to go electric then the next best option is panels (like a round pen).

If it was just a matter of eating too much you could go with a grazing muzzle.