Mandevilla Yellow Leaves with Brown Spots: Investigate Pests/Disease

Your multi-year deck Mandevilla has bottom leaves yellow with brown spots for weeks. Rest looks healthy. Same care as prior years.

Suspects

• Insects (check soil/leaves).
• Fungal/bacterial disease.
• Cat urine? (Smell soil).
• Natural aging of lower leaves?

Action

Take affected leaves to garden center for ID → targeted fungicide/insecticide.