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Crop Protection Lab Sample Update - June 2022

By Cerese Bawolin, B.Sc., Plant Health Technician, Crop Protection Lab, Regina

The month of June was colder than usual for many producers and some had a lot of precipitation. Due to the climate, many plants were submitted to the laboratory with symptoms of environmental stress due to cold weather, wet feet, frost and herbicide carry-over.

CPL has received 31 sample submissions in June. The samples submitted include wheat, durum, flax, canola, clover and lentils. Tree samples such as spruce, cedar and apple trees were also submitted.

Tan spot on durum sample
Tan spot (Pyrenophora tritici-repentis) on durum wheat sample

The significant crop disease diagnosis this June was fungal leaf spot complex diseases on cereal crops, including tan spot, septoria, stagonospora on durum and leaf spot complex/scald of barley. Other diseases of note were found on forage clover – fusarium root and crown rot and canola plants with damping-off and seedling blight caused by rhizoctonia solani.

The picture to the right shows an example of one of the diseased cereal crops sent to the lab with leaf lesions.

A summary of important CPL samples diagnosed in June 2022 is indicated in the table below:

Plant Diagnosis
Winter wheat Drought and Fusarium Root Rot
Durum Tan Spot
Durum Tan Spot and Septoria/Stagnospora
Barley Leaf spot complex including Scald
Clover Fusarium root and crown rot
Flax Seeding depth
Flax Environmental - cold weather and wet feet
Canola Herbicide Damage - Group 2 and Insect Damage
Hemp Herbicide Damage - Group 2
Canola Damping-off and seeding blight
Lentil Herbicide Damage - Group 2 and 4
Lentil Seeding Depth
Tobacco Brown Spot of Tobacco
Spruce Tree Insect and Sapsucker Damage
Spruce Tree Environmental - drought and summer kill

Dutch Elm Disease (DED)

DED on tree
An example of an Elm tree showing
symptoms of Dutch Elm Disease

The laboratory received 28 DED samples for testing in June. Please continue to keep an eye out for DED symptoms and submit samples to the laboratory for testing. The deadline for DED sample submissions is August 30, 2022.

Insect Identification

Twenty-five insect identifications including cutworms and wheat stem maggot damage were diagnosed in June 2022. Some examples identified in the lab were Springtails, Stiletto Fly Larvae and click beetle species – Collombola, Therividae, Hypnoidus Bicolor respectively.

Weed Identification

Weed samples identified in the lab for June 2022 were dame’s rocket (Hesperis matronalis L.), cow parsnip (Heracleum maximum) and scouring rush (Equisetum hyemale L.).

Dame's Rocket
An example of dame’s rocket (Hesperis matronalis L.) that was identified at the CPL. Photo credit goes to Bill Johnson at

The picture to the right is an example of one of the invasive weeds that were identified in the lab.

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