Pest of the Month July 2008 – Mango Powdery Mildew

  • Distribution:  Widely distributed throughout the Pacific
  • Host:  Mango
  • Symptoms:  Whitish-gray haze on panicles, fruits, and leaves.  Killed flowers turn brown & gray.


  • Plant cultivars that are less sensitive to the disease
  • Avoid cool, humid locations and areas that receive rain during the flowering season
  • Destroy infected fallen foliage and severely infected panicles
  • Prune competing vegetation to allow more light and air flow
  • Fertilze as required to promote vigorous growth
  • Apply fungicide sprays registered for powdery mildew

Source: Mango Powdery Mildew, Scot Nelson, University of Hawai’i Manoa, College of Tropical Agriculture and Human Resources, Cooperative Extension Service Plant Disease PD-46, August 2008.

Mango powdery mildew on panicles and young fruits. Photo courtesy Dr. Scot Nelson, UH CTAHR