Plumeria Disease and Treatment

Host Plant : Plumeria

Causal organism : Coleosporium plumeriae.


  1. Yellow-orange rust spots: The most common symptom of plumeria rust is the appearance of small, yellow-orange spots on the upper surfaces of the leaves.
  2. Powdery masses: As the disease progresses, the spots may develop powdery masses of orange spores, particularly on the underside of the leaves.
  3. Leaf distortion: Infected leaves may become distorted, curled, or may drop prematurely from the plant.​
  4. Reduced vigor: Severe infections can lead to reduced vigor and overall decline of the plumeria plant.


  1. Pruning: Remove and destroy infected leaves as soon as you notice them. This helps prevent the spread of the disease to healthy parts of the plant.
  2. Fungicides: Apply fungicides labeled for rust diseases according to the manufacturer's instructions. Fungicides containing active ingredients such as chlorothalonil or myclobutanil can be effective against plumeria rust.
  3. Preventive measures: Maintain good sanitation practices by cleaning up fallen leaves and debris around the plumeria plant. This helps reduce the likelihood of reinfection.
  4. Improve air circulation: Plumeria plants benefit from good air circulation, so make sure they are not overcrowded and have adequate space between them.
  5. Avoid overhead watering: Water the plumeria plant at the base to keep the foliage dry, as moisture promotes the development of fungal diseases like rust.
  6. Quarantine: If you have multiple plumeria plants, isolate any infected plants to prevent the spread of the disease to healthy ones.


Plumeria Insect Pests:

  •  Mealybugs: Mealybugs are small, white, cottony insects that often gather in clusters on the undersides of leaves and along stems.
  • Management: Use a cotton swab dipped in rubbing alcohol to dab and kill individual mealybugs. Alternatively, apply insecticidal soap or horticultural oil according to label instructions.

  • Spider Mites: These tiny pests suck sap from the leaves, causing stippling, webbing, and eventually leaf drop.
  • Management: Increase humidity around the plant by misting regularly. Use insecticidal soap or neem oil to spray affected areas. Predatory mites can also be introduced to control spider mite populations.

Shubhangi Alekar 2 April 2024
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