Will Roundup Kill Bromiliads? Or Salt?

[HereOnThePrimalEdge]

I have a huge area of bromiliads that is completely out of control.  I started cutting plants around the perimeter but they have razor sharp leaves and after a few cuts I call it a day.  I've probably removed 50 or so, but that's the tip of the iceberg.  I looked online to see if roundup will kill them but couldn't find a definitive answer and bromiliads have a somewhat different growth habit than normal rooted weeds.

Anyone have experience in this area?  If so, did you apply as usual?  Any specific tips?

[eightfingers2.0]

I’ve accidentally sprayed some of mine with roundup and it didn’t seem to affect them.

[kalakoa]

Last resort: Crossbow cut with diesel.

[Olohana 1790]

eventually, if you spray them a lot....
Ive nicked many and you can tell they were sprayed, but I dont remember actually killing them, I believe they grew back from woody stems. Ive never tried on purpose.
imo, Just get good thick gloves and a machete or shovel and hammer on them for a good 1/2 hour... til you poop out... then do the same thing 3 months from now when some grow back from the woody stems (the live part)... and then same kine again a few months later if any left... Ive kills them this way many times when they climb up trees 10+'

[HereOnThePrimalEdge]

I'm not ready to declare using salt a success just yet, but initial results are promising.

I bought a 40# bag of pool salt for $8.00 and applied  the salt granuals into the center of the bromiliads where they hold water, during a period of dry weather.
3' high bromiliad - about 2 heaping tablespoons
2' high bromiliad - about 1 heaping tablespoon

I did this about 10 days ago and the plants are turning brown, the tissue is softening, and if I pull on them the center part separates from the lower part of the plant. 
ONE CAUTION:
Some of my bromiliads are under trees.  The salt could eventually affect tree roots after the bromiliads break down, or during a heavy rainstorm.  Use carefully under tree canopies.