Plant Diseases

These pages will guide you through diagnosis and treatment of the most common Manitoba crop diseases. Check Seasonal Reports for news about problems emerging during the growing season.

Annual Disease Survey Results

Canola Disease Survey

Corn Disease Survey

Soybean Foliar Disease Survey

Wheat Disease Survey

Cereal Crops

• Bacterial Blight in Wheat, Oats and Barley
• Barley Yellow Dwarf
• Common Root Rot in Wheat, Barley and Oats
• Ergot
• Fusarium Head Blight
• Dealing with Fusarium Head Blight
• Fusarium Head Blight Forecasts and Interpretation
• Managing Fusarium Head Blight at Harvest
• Scouting and Control of Fusarium Head Blight in Wheat and Barley
• Goss's Wilt
• Leaf Rust in Wheat, Barley and Oats
• Leaf Rust in Winter Wheat Found in Manitoba
• Septoria Leaf and Glume Blotch in Wheat, Barley and Oats
• Stem Rust in Wheat, Barley and Oats
• Stripe Rust or Yellow Rust
• Tan Spot in Wheat
• Wheat Streak Mosaic

Fruit Crops 

• Iron Chlorosis of Fruit Crops
• Saskatoon Berry Disease Management: Protect the Flowers from Rain Showers
• Fireblight in Raspberries: Control Strategies for Commercial Raspberry Growers

General

• Aster Leafhoppers and Aster Yellows
• Powdery Mildew and Humid Conditions

Grass and Forages

•  Purple Eyespot in Timothy Crops

Oilseeds

• Blackleg
• Blackleg in Canola
• Blackleg is becoming more Serious in Canola
• Black Spot in Canola
• Clubroot
• Clubroot of Brassica Crops
• Clubroot of Canola: The Facts
• Clubroot Distribution in Manitoba
• Soil Sampling for Clubroot (PDF 654 KB)
• Interpreting a Clubroot Soil Test Result (PDF 456 KB)
• Downy Mildew in Sunflowers
• Fusarium Wilt in Flax
• Pasmo in Flax
• Phoma in Sunflowers
• Rust in Sunflowers
• Sclerotinia
• Sclerotinia in Canola
• Sclerotinia in Sunflowers
• Verticillium
• Verticillium Stripe (Wilt) of Canola Factsheet
• Verticillium Stripe (Wilt) of Canola Detected in Manitoba

Potato

• Early Blight in Potatoes
• Late Blight
• Integrated Management of Late Blight in Potatoes
• Late Blight Disease Management: Before it becomes a serious problem
• Late Blight in Potatoes
• Verticillium Wilt

Pulse Crops

• Anthracnose
• Anthracnose in Dry Beans
• Anthracnose in Lentils
• Ascochyta in Lentils
• Bacterial Blight (Halo Blight and Common Blight) in Dry Beans 
• Foot Rot and Mycosphaerella Blight in Field Peas
• Leaf Rust in Dry Beans
• Powdery Mildew in Field Peas
• White Mould (Sclerotinia)

Tree

• Browning Leaves on Ash? Likely Ash Anthracnose
• Black Knot of Prunus: What are those Black Lumps on my Trees?
• Needlecast Disease of Spruce
• Oak Leaf Blister
• Poplar Rust
• Venturia Leaf and Shoot Blight of Poplar
• Winter Sunscald and Frost Cracking: Tree Bark Damaged from Winter Bite

Vegetables

• Late Blight in Tomatoes
• Powdery Mildew
• Sclerotinia (White Mold) Disease on Carrots