Rust-Colored Spots on Ficus microcarpa 'Ginseng': Likely Scale

“Rust” on leaf undersides that doesn’t brush off is probably scale insects (brown, immobile bumps), not a fungal rust.

Treatment

1. Mix 5:1 water:isopropyl alcohol + squirt of dish soap.
2. Spray all leaf and stem surfaces until dripping wet.
3. The alcohol penetrates the scale’s shell.

If spots brush off easily, they could be spider mite damage or fungal spores—send a photo for confirmation.

For pest treatment guide, email wcreed@HorticulturalHelp.com.