I would look at making sure the following other requirements are being met for your frangipani to flourish. It may be that the plant is not getting enough light. Make sure the frangipani is in a place where it receives six to eight hours of sun or bright light every day. Water frangipani with 1 inch of water every week. Always allow the soil to dry before you water again; frangipani needs warmth, but does not need excessive watering. Never allow the plants to sit in water. Fertilize frangipani once every summer with liquid fish and seaweed fertilizer to give the plant nitrogen, phosphorous and potash for growing. The white on leaves could also be powdery mildew which is generally caused by poor air circulation (or high humidity), and can be treated with white oil or a fungicide. If you prefer an organic solution, try mixing a little powdered milk with some detergent and a little water and spray that on the leaves. Make sure whatever you use you spray late afternoon after the sun has gone off the leaves (to prevent scorching from the sun). It usually shows up as powdery white splotches so closely inspect the leaves first.
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