The leaves of a Ficus Lyrata, or as it's commonly called a Fiddle Leaf Fig, usually turn yellow because of an insect infestation such as u003ca href=u0022http://houseplant411.com/glossary/scale-plant-pestsu0022u003escaleu003c/au003e, spider mites, or u003ca href=u0022http://houseplant411.com/glossary/mealy-bugs-how-to-identify-and-treatu0022u003eMealy Bugsu003c/au003e. The plants pests suck the color from the leaves. If the Ficus Lyrata is getting too much sun the leaves may bleach out and take on a yellowish hue.