Leafspots on orchid leaves

Leafspots on orchid leaves

Updated: March 13, 2023

Symptoms of a fungal disease on indoor plants

  • There are many species of fungi that can cause leaf spots on houseplants.

  • Symptoms often include many tan to reddish brown to black roughly circular spots or lesions that may run together to cause large irregular shaped lesions¬†or blighting of the entire leaf.

  • If the leaf spots attack the newest leaves near the top of the plant the growing point may be killed.

  • Leaf spots can enlarge and grow onto branches and stems.

  • Severe infections often cause extensive leaf drop and dieback.

Management strategies

  • Individual leaves with spots can be picked off and destroyed.

  • Any method that will lower the humidity, decrease leaf wetness or increase air circulation will help to lessen the chances of infection.

  • Watering should be done early in the day to allow leaf surfaces time to dry quickly.

  • Space plants so that air can circulate between them to help reduce moisture.

  • Registered fungicides labeled for houseplants can be used, but in most home conditions, removal of infected plant parts and adjustment of environmental conditions to drier conditions should help.