Smut disease of onion – Interesting facts | Agristudent.com

Smut disease of Onion

The smut disease of onion is caused by Urocystis cepulae

The main symptom is that the Black smut sori are seen at the base of the leaves and leaf surface and when this sori are ruptured then Black powdery mass is seen.

The fungus remains viable for 15 years in infected soil by means of spore balls.

It persists in soil as a saprophyte.

Onion bulbs and onion transplants are important means of widespread distribution of the fungus.

Implements also help in the spread.

Wind borne soil and surface drainage water are important means of local dissemination.

The main control.measure is the Seed treatment with Thiram or Captan @ 4g/kg.

The bulbs may be dipped in Thiram solution 0.25%.

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