Just because the other plants are not being affected doesn't mean it couldn't be fertilizer burn. Every plant has its sensitivities just like people. Some plants are just more sensitive than others.
Could we see pictures? That would help to determine if it is fungal, fertilizer burn, or something else. If it was fungal I would think you would see fungus or mold. I bet it is from salt build up.
Bud- If it is fertilizer burn soaking the roots in fertilizer will only make it worse. In my experience when root tips do this it is from fertilizer burn, salt build up, or damaged root tips from mechanical damage.
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