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Bean rust

Raised reddish brown pustules ringed with yellow form on the leaf underside and rub off as a rusty powder.

Uromyces vignae, Uromyces appendiculatus Fungus Fact sheet
Bean rust (Uromyces): rust colored pustules spread over a bean leaf
Photo: Jan Sheppard, CC BY, via iNaturalist

Crops it strikes

Sitaw String bean Paayap Cowpea Patani Lima bean Monggo Mungbean

What you see

Spots or streaksYellowing

When to act

From the first flowers, check the underside of the older leaves every week. Start spraying when the first rusty pustules show and the weather stays humid. A crop already near its last picking rarely pays for a spray.

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

  • Plant a rust resistant or tolerant variety where one suits your area.
  • Do not plant a new crop beside an old rusty one, and pull volunteer bean plants. Spores blow from old plantings to new.
  • Space the rows so leaves dry fast, and do not water over the leaves late in the day.
  • Plow under or remove old vines and leaves right after the last picking.
  • Rotate with crops outside the bean family for at least a season.

Not sure it is this one?

Many diseases look alike. Send a photo to Anee, the smart farm technician in anee.io. She reads it with your crop, its age and the weather, and tells you what it most likely is and what to do first. In Tagalog or English.

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