Cheryl in TX has D. filiformis with mildew destroying leaf tips indoors under lights (69°F). Jeff Dallas recommends Bayer Advanced 3-in-1 (systemic fungicide, safe). Notes: "problems you're having sound like a direct result of having the plant indoors... Typically these plants would be dormant this time of year." D. filiformis (zones 8-5) handles much colder winters.
Good Growing!
Jeff Dallas
Sarracenia Northwest
https://www.cobraplant.com
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