Diseases Common Onion Diseases Click here to download the Seminis Onion Disease Guide. Bacterial Soft Rot Basal Plate Rot Black Mold Blue Mold Rot Botrytis Bulb Rot Dodder Downy Mildew Lesion Nematode Neck Rot (PDF) Onion Maggots (PDF) Onion Rust Pink Root Powdery Mildew Purple Blotch Smudge Yeast Soft Rot Sour Skin White Rot Stem and Bulb Nematode Stemphylium Leaf Blight Sunscald
