Citrus Scab on Arizona Sweet Orange: Neem Oil for Fungal Lesions

Identification

Blackish-brown spots on leaf undersides = citrus scab (fungal). Encouraged by damp springs or overhead irrigation.

Control

• Pure Neem Oil (Dyna-Gro) – corrects scab, organic, doesn’t wash off.
• Alternative: Captan fungicide (late winter pre-bloom + petal fall).
• Never use sprinklers on citrus; use drip/soaker at dripline.

Application

Mix neem oil with water + a drop of non-antibacterial dish soap. Spray thoroughly.