If it is bacterial wilt you should be able to see a white stream of material flow from the stem when you put the cut end of the stem in water. The link shows a picture of the stem in water and streaming bacteria.
Also, any time I have a plant wilt I look at the cut stem for discoloration of the vascular tissue suggestive of fusarium, verticillium , or walnut wilt. My plant didn't have discoloration or streaming bacteria so I guess I will never know for sure.
Marla
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