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

Drilling date

Take-all inoculum starts to decrease soon after harvest. Therefore, risk to the next crop decreases as the interval between harvest and drilling lengthens, as shown diagrammatically in Figure 6. However, any benefit from later sowing may be lost if volunteers or susceptible grasses are allowed to grow between crops.

Figure 6. Inoculum level and drilling date: later drilling = lower inoculum

Earlier drilling of first wheats increases the risk that damaging take-all will develop in second wheats.

Where possible, second wheats should not be sown before the second half of October (Table 2).

Table 2. How drilling date may affect take-all severity and yield of second wheat

  6 Oct 18 Oct 31 Oct 13 Nov
Final take-all index 52.5 46.0 44.0 21.1
Yield (t/ha) 6.0 6.8 6.9 6.2

ADAS Rosemaund

Drilling dates for continuous cereals should be the same as for second wheats.

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