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Current Affairs

Yellow rust disease

Date: 01 February 2020 Tags: Miscellaneous

Issue

The Punjab Agriculture and Farmers’ Welfare Department issued an advisory about Yellow Rust disease in wheat crops followed by a similar advisory from the Indian Institute of Wheat and Barley Research (IIWBR).

 

Background

This occurs when the rust colonies in the leaves drain the carbohydrates from the plant and reduce the green leaf area. The yield due to the disease can affect between 5 and 30 per cent.

 

Details

  • Yellow Rust disease appears as yellow stripes of powder or dust on leaves and leaf sheaths of the wheat crop. This yellow powder comes out on clothing or fingers when touched.

  • The disease can spread rapidly under congenial conditions and affects crop development, and eventually the yield.

  • In India, it is a major disease in the Northern Hill Zone and the North-Western Plain Zone and spreads easily during the onset of cool weather and when wind conditions are favourable. Rain, dew and fog favour the disease’s development.

Symptoms

  • Yellow rust, or stripe rust, takes its name from the appearance of yellow-colored stripes produced parallel along the venations of each leaf blade.

  • These yellow stripes are actually characteristic of uredinia that produce yellow colored urediniospores.

  • Primary hosts of yellow rust of wheat are Triticum aestivum (bread wheat), Triticum turgidum (durum wheat), triticale, and a few Hordeum vulgare (barley) cultivars.

Prevention

  • Breeding resistant varieties is the most cost-effective method to control this rust. Fungicides are available but vary in availability depending on their registration restrictions by national or state governments.

  • Development of varieties resistant to the disease is always an important objective in wheat breeding programs for crop improvement.

  • Last year, a new variety of wheat called HD-3226 or Pusa Yashasvi was released by the Indian Agricultural Research Institute, which had higher levels of resistance against major rust fungi such as the yellow/stripe, brown/leaf and black/stem.