Take-all - image 1
Wheat, more pronounced in winter wheat than in spring wheat.
Pattern of damage
Significantly reduced root biomass and blackened root system. In later stages, the root tips and the base of the stems are attacked, which then also become blackened (Picture 1). The plant water- and nutrient balance are strongly impaired; individual plants die while others are stunted. In dry weather periods, premature ripening and whiteheads are seen.
Acidify soil using ammonia fertilizer. Increase the time between grain crops in any crop rotation. Perform measures that promote soil structure. Reduce soil tillage to a minimum (prevents spread). Provide adequate plant nutrients. Promote fast and strong development of young plants. Control couch grass. Fungicide seed treatment.
Spread/Transmission: Soilborne fungi that survives on crop residue, volunteer grain and grass weeds such as couch grass. It is capable of migrating only small distances in the soil and therefore appears in patches. Spread is promoted in wet, basic soils with temperatures between 12-20° C and short host crop rotation intervals. It first infects the root hair and ultimately the entire root system.