Do check that the filepaths are correct. Just because the map has it added doesn't mean the mapper knew what they were doing and may have not referenced the file correctly.
Incorrect filepaths are one of the most common causes for issues like this.
Just another thought, did you enable "crop destruction" while ingame?
So I can only get crop destruction to work if i copy the values in the fruit types xml when I use the Wheat settings. for some reason the state causes the issue. when I checked the growth xml barley only has 8 states. I'm assuming this is linked. However I'm quite new at modding as you can probably tell.
Make sure all the Barley files have copied across and overwritten any existing files. Sometimes Windows copy and paste doesn't always replace all data properly. This can cause this issue, as while you think you've copied over the correct data, it's actually the original data still there.
Also my crop destruction ingores all states before harvest stages. As having green crops turning to stubble completely breaks immersion. In RL they would recover and grow back reasonably well before harvest time.
The only thing I would suggest is re-downloading the texture pack again, just in case a file had corrupted.
