POWDERY MILDEW - a disease in winter crops to cause crop losses!

               Powdery mildew in crops 

Powdery mildew disease in many crops is caused by an obligate parasitic fungus.  Powdery mildew disease is more evident in humid areas with warm days and cool nights. Powdery mildew spores can germinate in 10–12 hours supported by low light levels, high humidity, and moderate tem­peratures and are mainly dispersed by wind currents.

              Powdery mildew spores

Different fungi can cause powdery mildew on different crops

  • Erysiphe orontii – host plants are tomato, pepper, eggplant, potato and other solanacoeus crops, squash, cucumber and other cucurbits.

               ERYSIPHE ORNTII infection powdery mildew

  • Erysiphe polygoni – Carrot and beet root and

               Powdery mildew disease caused by ERYSIPHE POLYGONI

  • Erysiphe cichoracearum; Sphaerotheca fuliginea; Podosphaera fusca; and Podosphaera fuliginea are different fungal strains that can cause powdery mildew disease on cucurbit crops like cucumber, watermelon, muskmelon, ridge gourd, bottle gourd, ash gourd, snake gourd, squash, etc.

              Powdery mildew infection caused by SPHAEROTHECA FULIGINEA

  • Oidium caricae - Papaya crop

              Powdery mildew disease caused by OIDIUM CARICAE

  • Podosphaera leucotricha - Apple and Pear


Symptoms of Powdery mildew

  • The undersides of leaves are speckled with small, water-soaked spots that become powdery patches of mycelium and spores.
  • The infections are usually concentrated near the leaf veins.
  • The white patches are from 1–6 cm in diameter, with corresponding yellowish-green spots on the upper leaf surface.

          Powdery mildew disease on crops 

  • The mildewed areas grow in size and coalesce, causing increasingly severe yellowing between the veins. In some cases, the spore-forming mycelium will wrap around the leaf edge and grow on the upper leaf surface and petioles.
  • As the disease progresses, severely infected leaves become necrotic and appear scorched.
  • They curl and fall from plants prematurely. Mildew on immature fruit begins as circular patches of white mycelium and spores that can coalesce and cover the entire fruit.

          Powdery mildew in Crops

  • As the fruit ripens, the fungus may disappear, leaving behind grey scars.
  • The scars restrict growth of the underlying tissue, resulting in deformed fruit. The deformed fruit is edible but has little or no value in the market.

 Chemical control of Powdery mildew disease on crops

  1. Luna experience 1 mL/L of water spray can control the powdery mildew disease.
  2. Merivon35 mL/L
  3. Karathane gold35 mL/L
  4. Taspa 1 mL/L

   Chemical control of powdery mildew in crops

Click the link to find more chemical control agents of powdery mildew disease.



Biological control of Powdery mildew disease on crops

  1. Multiplex Biojodi 10 – 15 gm/L
  2. Mildown 10 – 15 gm/L
  3. Milastin 2- 3 mL/L
  4. Elixir 3 mL/L

     Biological control of powdery mildew in crops1

Click the link to find more chemical control agents of powdery mildew disease.



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Disclaimer: The performance of the product (s) is subject to usage as per manufacturer guidelines. Read enclosed leaflet of the product(s) carefully before use. The use of this product(s)/ information is at the discretion of user.

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