White marks on African violets
The leaves and stems of my African violets have white marks on them resembling chalk. If I do not wipe them off, they become cotton woolly but there is never an insect to be seen. I have been treating them with eucalyptus or tea tree oil which seems to work but have been told this is a little harsh. It does not seem to affect the life of the plant. I have checked out many insect pests but this does not appear.
Answered: 20 Dec, 2021