Wheat Streak Mosaic is a viral disease that is commonly found in winter wheat. Although the disease is typically found in southern Alberta, we continue to monitor winter wheat crops in the County.

How is it Spread?

Wheat Streak Mosaic is spread by a tiny mite that enters the plant through the leaves and is then translocated into all areas, causing destruction of chlorophyll.

  Wheat Streak Mosaic

What to Look For

The disease can be identified by light green or yellow stripes that develop on the leaves. Stunted plants are also a sign that the disease is present in a field. The earlier the infection, the greater the damage.

  Wheat Streak Mosaic  Wheat Streak Mosaic 

Leaf symptoms                          Severe leaf symptoms 

Wheat Streak Mosaic

Soil borne infections


There is currently no pesticide control for Wheat Streak Mosaic, which makes these prevention methods much more important to help prevent the establishment and spread of the disease:

  • Destroy all volunteer wheat, and other host crops in and around the field to be seeded to wheat;
  • Cultivation may be an included tool for  removal of volunteer plants;
  • Practice good agronomic practices including use of certified seed with a recommended treatment; and
  • Rotate crops using a non-host plant every second year.

Related Links

Agri-Facts Wheat Streak Mosaic

Manitoba Government Wheat Streak Mosaic