Fusarium wilt can rot the stems, roots, or the bulbs. It is usually caused by cool temps and excess moisture. It will stop the translocation/movement of water through the plant tissues, giving the limp look to the plant and leaves. Fusarium normally starts in the roots, so the plant can look healthy on top, but is slowly dehydrating due to the roots being clogged with this bacteria. Look for dark areas on the roots where they connect to the base of the plant, that may be hard and dry. The older leaves will become limp and leathery, and may have yellow streaks or sunken spots. The new leaves will become reddish or purple and flower spikes will usually drop their flowers and buds. There are chemicals like Cleary's 3336 and Daconil that are effective on fusarium. I don't know if this is what you have from your pictures and info you have given, it sounds more like just dehydration. I hope this helps, look at the roots
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