brown leaf spots on Anthurium
Quick answer
If your Anthurium has brown leaf spots, the most likely cause is: Brown leaf spots on Anthurium result from Xanthomonas campestris pv. dieffenbachiae (bacterial leaf spot) or Anthracnose (Colletotrichum gloeosporioides) infections, which enter through wounds and hydathodes on the waxy leaf surface. Bacteria multiply in moist conditions, producing water-soaked lesions that turn коричневый (brown) with yellow halos as plant tissue collapses. The glabrous, hydrophobic leaf surface of Anthurium retains moisture longer than velvety aroids, creating favorable conditions for bacterial proliferation.
Start here:
- 1. Isolate affected plant immediately to prevent spread to other aroids
- 2. Remove severely infected leaves at the base with sterilized scissors; surface sterilize tools between cuts with 10% bleach solution
Why Anthurium gets brown leaf spots
Anthurium spp.
Brown leaf spots on Anthurium result from Xanthomonas campestris pv. dieffenbachiae (bacterial leaf spot) or Anthracnose (Colletotrichum gloeosporioides) infections, which enter through wounds and hydathodes on the waxy leaf surface. Bacteria multiply in moist conditions, producing water-soaked lesions that turn коричневый (brown) with yellow halos as plant tissue collapses. The glabrous, hydrophobic leaf surface of Anthurium retains moisture longer than velvety aroids, creating favorable conditions for bacterial proliferation.
How to reverse brown leaf spots on Anthurium
- 1
Isolate affected plant immediately to prevent spread to other aroids
- 2
Remove severely infected leaves at the base with sterilized scissors; surface sterilize tools between cuts with 10% bleach solution
- 3
Cease overhead watering — switch to bottom watering by placing pot in saucer of water for 15-20 minutes
- 4
Improve air circulation: space plants 6+ inches apart, run small fan on low nearby
- 5
Apply copper-based bactericide or neem oil spray weekly for 3-4 weeks as suppressive treatment
- 6
Monitor new growth for 4-6 weeks; if spots continue spreading on new leaves, the infection is systemic and recovery is unlikely
Keep brown leaf spots off this Anthurium
Avoid overhead watering and wetting leaves; improve air circulation with spacing; maintain 60-80% RH with good airflow to prevent leaf wetness; quarantine new plants for 2-3 weeks before introducing to collection.