| Coleus Problems | | Symptom | Probable Cause |
| Black powdery sooty mold fungus forms on honeydew; plants may die if problem continues | Aphids Herded By Ants |
| Leaves start to drop off the plant | Cold wet soils and poor cultural practices |
| Weakened plants; yellow leaves; leaves discolored; covered with honeydew | Whiteflies |
| Oval, white insects; leaves deformed, discolored; leaves shiny, sticky | Mealybugs |
| Leaves stippled, yellowing or bronze; dry out and drop may be webbing visible; sometimes galls form on leaves | Mites |
| Leaves yellow, wilt, die | Root Rot, replace the plant |
| Dark lesions on stems; roots rot | Stem Rot, replace the plant |
| Leaves blotched, tan | Sunburn, move plant to more shady location |
| Plant actually disappears | Deer |
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