Ligustrum Oblong Leaf Spots: Insect Feeding, Not Disease

Overall View

Close Up Damage

Five 5-yr ligustrums show oblong spots starting on leaf undersides; leaves become brittle, yellow, drop. 60–75% affected. Fungicides, systemic fungicides, insecticides failed.

Diagnosis: Insect Puncture Damage

Spots are feeding/egg-laying punctures—not fungal lesions. That's why fungicides failed. Likely culprits: lace bugs, plant bugs, or thrips.

Management

• Collect affected leaves + any insects in vial → county extension for ID.
• Rake and destroy fallen leaves (overwintering site).
• Prune heavily damaged sections.
• Extension may recommend Orthene or Malathion.

Impact is mostly cosmetic; plant health rarely threatened.