Orange Tree Black Specks on Leaves: Need Photo

2-year-old orange tree has black specks on leaf undersides. Could be scale, mite damage, fungal spores, or insect frass.

Diagnosis

Send clear close-up of leaf with ruler for scale. Review focus on computer. Note if specks brush off, are raised, or cause leaf damage.

Common Citrus Pests

• Citrus snow scale (white, but can darken).
• Spider mites (stippling, not specks).
• Greasy spot fungus (yellow-brown blisters).