I have a large Ctenanthe burle-marxii indoor house plant with a strange problem.
I've has the plant for around 3 years, however around 6-months ago, the plant started displaying a problem where the underside of almost every leaf has many small white 'secretions' that are sticky to the touch. These secretions leave a sticky residue to anything that comes in contact with them.
Each secretions seems to represent a small hole on the upward facing part of each leaf.
Apart from these annoying sticky secretions, the plant seems otherwise healthy.
Does anyone have any idea what might cause this?
Thanks for any advice!