See:
Wheat (Triticum aestivum) - Take-all
Wheat (Triticum aestivum) - Common Bunt (Stinking Smut)
Wheat (Triticum aestivum) - Fusarium Root, Crown, and Foot Rot (Crown Rot, Foot Rot, Seedling Blight, Dryland Foot Rot)
Wheat (Triticum aestivum) - Pythium Root Rot
Fungicide Effectiveness as Seed Treatments for Cereal Diseases
