Cottony clumps: check for mealybugs
Look for white, waxy insects where leaves meet the stem.

What to check first
Inspect leaf joints, the stem and leaf undersides. Mealybugs often sit in distinct cottony clumps; you may see an oval insect in the wax or sticky residue on leaves below.
What to do now
Move the plant away from others and check its neighbors. Wipe away small clusters with a damp cotton swab. Use a fresh swab for another plant.
What to watch next
Recheck the same joints and new growth over the next few weeks. If clusters keep coming back or appear on several plants, identify the pest before choosing a treatment.