Controlling Brown Soft Scale on Indoor Avocado Trees

Controlling Brown Soft Scale on Indoor Avocado Trees

A 20-year-old indoor avocado tree showing sticky residue (honeydew) and small brown spots on leaves is likely infested with brown soft scale. These immobile, oval insects attach to stems and leaf undersides, feeding on sap and excreting sugary honeydew that attracts sooty mold.

Treatment Options

Systemic Insecticide (Recommended for Large Infestations)

Bayer Advanced Tree and Shrub Insecticide (imidacloprid) mixed with water and applied as a soil drench provides systemic control. The tree takes up the insecticide, killing scale within 2 weeks. Note: Check label for edible crop restrictions; if the tree bears fruit you intend to eat, avoid this product.

Manual Removal (For Light Infestations)

• Dip a cotton swab in heavy mineral oil (or neem oil).
• Gently coat each scale insect to suffocate it.
• Avoid covering large leaf areas to prevent leaf damage.

Prevention

• Inspect new plants before bringing indoors.
• Wipe leaves periodically with a damp cloth.
• Maintain good air circulation and avoid over-fertilization.

With consistent treatment, your avocado tree can regain its health and vigor.