the white stuff could be "white fly".9 s! {1 ?2 {3 c4 \, V8 y M
I had the same problem before. It because your plant is too wet. I showed the leaves twice a day for a whole week, then the white filies were all gone. _6 p% [5 ]: ` t# D1 E* HHibiscus is a typical plant, show helps a lot.