White Residue on Dill: Identification and Organic Treatment

White, rubbable coating on dill seedlings is likely powdery mildew or aphid honeydew residue. Both are treatable organically.

Diagnosis

• Powdery mildew: White powder on both leaf surfaces; favors dry, humid conditions.
• Aphids: Check undersides for tiny green/black insects; sticky honeydew attracts sooty mold.

Homemade Spray

Formula: 1 tbsp rubbing alcohol + 1 tbsp hot sauce + 1 qt water in spray bottle.

Test: Spray one leaf, wait 24h. If burn, dilute 1:3 with water.

Apply: Every 3 days, covering tops and undersides, until resolved.

Alternative: Gardens Alive

Gardens Alive (gardensalive.com) sells organic fungicides (potassium bicarbonate) and insecticides (neem, pyrethrin) safe for edibles.

Prevention

• Space plants for airflow.
• Water at base, not foliage.
• Morning sun to dry leaves quickly.
• Rotate dill location yearly.

Safety

Wash treated dill thoroughly before eating. Discard if heavily infested.