Autumn weather cools take-all risk
Take-all risk falls relatively rapidly after harvest, so that delaying drilling reduces the disease in second wheats.
Climatic conditions before, during and after sowing, fuel the pace of the decline in risk. Soil temperature during the autumn is particularly influential.
The pathogen is active in the soil when temperatures are above 10–12˚C. Therefore, sowings of second wheats should ideally be delayed until soil temperatures are at or below 12˚C.
Soil temperature usually falls below 12˚C in the second half of October. The actual time when the critical temperature is reached will vary from year to year, due to location and the weather.
AHDB’s WeatherHub includes up to date information on soil temperatures from sites across the UK. The information can be used to guide the decisions on the drilling date for second wheats to help minimise the risk of take-all.