Weeds, Insects & Diseases

Take-All [Gaeumannomyces graminis]


Disease Biology

The fungus casuing take-all overwinters on crop residue, and roots growing near infested debris become infected. Favoured by cool temperatures (optimum 10C-20C), wet soil conditions and alkaline or nutrient deficient soils. Most prevalent on fields ...


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Damage Description

In severe infestations, scattered plants or groups of plants show premature ripening (whiteheads) and stunting. The plants are easily pulled because the roots have rotted, in contrast to common root rot. Roots are blackened and usually a shiny blac...


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Management

Severe take-all may develop if wheat follows a grass crop. Allow at least one year between susceptible crops and control growth of volunteer wheat and grassy weeds. Maintain adequate fertility. Lower levels of disease occur with spring-applied tha...


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Description

The fungus casuing take-all overwinters on crop residue, and roots growing near infested debris become infected. Favoured by cool temperatures (optimum 10C-20C), wet soil conditions and alkaline or nutrient deficient soils. Most prevalent on fields seeded 2-4 years in a row.

  • Take-All
  • Take-All

Damage Description

In severe infestations, scattered plants or groups of plants show premature ripening (whiteheads) and stunting. The plants are easily pulled because the roots have rotted, in contrast to common root rot. Roots are blackened and usually a shiny black lesion extends up the stem. Less severely infected plants do not die prematurely but have brown to black lesions on the crown and roots.

Yield loss occurs because severely infected plants produce no grain or severely shrivelled grain. Less severely infected plants produce fewer heads and kernel weight is reduced.

    Management

    Severe take-all may develop if wheat follows a grass crop. Allow at least one year between susceptible crops and control growth of volunteer wheat and grassy weeds. Maintain adequate fertility. Lower levels of disease occur with spring-applied than fall-applied nitrogen. In acid soils application of anhydrous ammonia. Seed treatments may suppress disease over the entire growing season.