Is you beardie still eating live food? Has he been stressed by anything lately, or been behaving differently or sick? How old is it?
If it isnt eating anything, I would give it 3 days before your start worrying. But if it is eating live food and just no salad, I really wouldnt worry much. Ive found that when my beardie is stressed by something, the salad is the food he will refuse... When I first brought Dudley home, it was over 2 weeks before he would eat his salad for me.
Sometimes they will just not be hungry too. How long has it been since your beardie ate salad?
I would try hand feeding, and offering some hard-to-resist favorites- Any thing that is brightly colored like raspberries, red bell pepper, watermelon, squash, blueberries ect are pretty tempting to them!