The peel on some of my oranges has turned brown. What’s wrong with them?
Tiny rust mites feed on the peel during the summer causing a russeting of the peel. The interior quality of the fruit is not affected. Homeowners can ignore this, but if desired, rust mites can be controlled or prevented by spraying the tree with a material called Kelthane. One application is usually enough to control the pest. Apply Kelthane when the fruit is almost mature. Read the directions on the label before applying. The fruit is still edible but will not change back to its original color. There are yellowish spots on the leaves of my citrus and many leaves are dropping off. The first appearance of the Greasy Spot Fungus disease is as a yellow green spot, which becomes orange yellow. In the latter stages, the area becomes raised on both sides of the leaf, and color becomes tan, then dark brown to black. The tree must be sprayed with copper fungicide before symptoms occur. Once symptoms appear, no amount of spraying will cure the problem. Link: http://edis.ifas.ufl.
