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That looks like fungus or rust to me. Could be infected, but often with house plants, the infection is secondary....they are in a weakened state...
Cool! 'comosum' looks very nice! DARK green. Thanks for the link. I'll keep my eyes peeled.
Yeah, I'm a registered-plus member, says so under my username, still don't see the signatures option in my settings.
Just wondering if we're allowed to have text signatures? I can't find the option anywhere in my userCP.
I would suggest pH first. That and TDS (total desolved solids) could be the culprit.
Are there any non-variegated forms of the Chlorophytum? I can't seem to find any anywhere?
I've tried that in the past and its worked. But yeah, as stated, killing them in the summer is 99.99% of the time just eradicating the workers.