Curling Leaves On Orange Tree - Knowledgebase Question

Orange, CA
Avatar for dlsalcido
Question by dlsalcido
March 11, 2000
We have a valencia orange tree that has developed a white "fuzz" on the back of the leaves. Also, many of the leaves are curling. What do you suggest?

Answer from NGA
March 11, 2000
It sounds more like an insect than a disease, but without seeing the leaves, it's difficult to say for certain. Powdery mildew, a fungal disease, can leave a white coating on leaves and cause them to curl, but it's unusual on citrus, and generally occurs on the upper surface of the leaves.

A more likely problem is cottony scale or mealy bugs. Both insects are common pests of citrus and a by-product of each is a sticky honeydew with accompanying sooty mold growth on plant parts below the infestation.

Without knowing precisely what you're dealing with, it's hard to suggest control measures. Why not take a sample of the problem to your local Cooperative Extension for diagnosis and treatment? In Orange County phone 714-708-1606 to find a plant problem clinic near your home.

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