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What is this white silk looking stuff on my plant?
(reddthat.com)
In the spirit of making Trees a welcoming and uplifting place for everyone, please follow our Commandments.
It's likely too late, but there's no need to kill off any of the plants or damage any colas.
Look into a spray meant to kill them off, and consider boosting the airflow, lowering the temp, and increasing humidity (if possible).
They don't like heat and dryness. Do not boost humidity. Make sure to apply insecticide 3 to five times. Their eggs can survive even after they die.