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Crop Protection Laboratory Update - July 2022

By Cerese Bawolin, B.Sc., Plant Health Tech, Regina

Downy Mildew on Field Peas
Fig. 1. Downy Mildew (Peronospora viciae) on Field Peas

The Crop Protection Lab received 65 sample submissions in July. The samples submitted include wheat, durum, canola, field peas and lentils. Other submissions included trees such as juniper, ash and apple.

This July, significant crop disease diagnosis were fungal diseases on cereal crops, including tan spot, septoria, fusarium head blight, stagonospora on durum and net blotch of barley. Other diseases of note were field peas with downy mildew, septoria and root rots.

A summary of Crop Protection Laboratory samples diagnosed in July 2022 is in Table 1.

Plant Diagnosis
Apple Apple Scab
Silver Leaf
Barley Net Blotch
Barley Bacterial Growth
Elm Dutch elm disease
Green ash Environmental stress
Juniper Environmental stress
Chickpea Environmental stress
Durum Fusarium Head Blight
Field Pea Fusarium Root Rot
Coriander Herbicide Damage (Group 2)
Lentil Herbicide Damage (contact membrane disruptor)
Canola Herbicide Damage (Group 2)
Mustard Herbicide Damage (Group 2, glysophate and Group 14)
Oats Herbicide Damage (Group 1)
Canola Herbicide Damage (Group 2 and Group 4)
Field Pea Root rot complexes (fuarium, oomycetes and rhizoctonia
Field Pea Downey Mildew
Field Pea Septoria
Durum Septoria/stagnospora leaf blotch complex
Durum Tan Spot
Wheat Tan Spot
Wheat Fusarium Head Blight

Dutch Elm Disease (DED)

Dutch Elm Disease examples
Fig. 3. Example of Dutch Elm Disease (Ophiostoma novo- ulmi) isolated from a symptomatic elm under magnification and an example of a sample at the Crop Protection Lab.

The laboratory received a total of 187 DED samples for testing. So far, there are 43 DED positive samples and 14 Dothiorella wilt positive samples. Saskatchewan residents who suspect DED are encouraged to send samples in for testing free of charge. The instructions for sending in an appropriate sample and submission forms are available on our website. We would also like to remind Elm tree owners that our deadline for DED sample submissions is August 30, 2022.

Weed Identification

An identified weed of note this July was leafy spurge. It has been prevalent in Saskatchewan and is a noxious weed that originated from Eastern Europe.

Leafy spurge
Fig. 4. An example of Leafy Spurge (Euphorbia esula L.)

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