My poor Camillia
I have these horrible white whatever on the back side of my leaves. I notices it when some leave were looking funny. They curled up and were a pale green. When I cut it off I saw the white stuff on the back of MANY MANY leave on the bush. Help
Prince George's County Maryland
This is cottony camellia scale. It is a type of insect. This explains it: https://extension.umd.edu/hgic/topics/cottony-camellia-scale-shrubs
If you spray crawlers now with horticultural oil or soap, read the label very carefully and follow directions for the temperature limits, so you do not burn the leaves.