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White rust

Raised white blisters under the leaves burst into white powder, with yellow patches above and twisted, swollen shoots.

Albugo candida (cabbage family), Albugo ipomoeae aquaticae (kangkong) Water mold Fact sheet
White rust (Albugo candida): white, blister like pustules on a leaf
Photo: Lena Struwe, CC BY SA, via iNaturalist

Crops it strikes

Kangkong Water spinach Mustasa Mustard Petsay Pechay Labanos Radish Repolyo Cabbage

What you see

Spots or streaksPowdery or fuzzy growthCurled or mottled leaves

When to act

In cool, humid weeks check the underside of leaves twice a week for white, blister like pustules. Pick off the first infected leaves, and start protectant sprays when pustules show on many plants.

What to spray

Active ingredients only, never brands. The FRAC group tells how it works: switch to a different group next time, so the disease does not learn to survive it. Spray only when the damage is worth the cost, and only with products registered with the Fertilizer and Pesticide Authority for your crop. Follow the label. The Shopee and Lazada links only show who sells something with that active ingredient, not a recommendation of any seller or product.

How to prevent it

  • Sow clean seed, and plant kangkong cuttings only from healthy beds.
  • Rotate for two years away from the cabbage family, and away from kangkong for kangkong beds.
  • Remove infected leaves and plants early, and clear crop residue after harvest.
  • Pull wild mustards and wild morning glory weeds that carry the same fungus.
  • Space the plants and water at the base in the morning so leaves dry before night.

Where this comes from

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