Take-all in winter wheat - management guidelines (HGCA Autumn 2006)

‘Take-all decline’

This occurs because microbial organisms antagonistic to the take-all fungus build up in soil, reducing the rate of secondary spread.

Once take-all decline has become established, less yield loss will occur, although yields will typically be lower than for first wheats.

Take-all decline can develop in successive crops of wheat, barley or triticale. The disease becomes most severe in winter wheat, and the consequent take-all decline is robust, conferring protection on wheat and the less susceptible cereals. However, where decline is built up under such crops, it will not protect winter wheat. Therefore, growing wheat after a barley (or triticale) crop often leads to severe take-all (Table 1).

Table 1. Wheat yields in fourth year of rotation

Rotation W W W W W W B W
Final take-all index 21.6 56.6
Yield t/ha @85% dm 8.7 5.6

  W = wheat B = barley

ADAS Rosemaund

Effective take-all decline, established after a long run of susceptible crops, will not be completely lost after a one-year break or set-aside. Longer or frequently-repeated breaks will result in the complete loss of take-all decline.

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