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Crop Diagnostic Lab Report

Week of June 28 - July 2, 2010

Cereals One sample of wheat with loose smut was received (Eastman). One sample of wheat with Septoria leaf spot was received (Eastman). Two sample of winter wheat were diagnosed with physiological leaf spot (Central Plains, Red River). One sample of wheat with contact herbicide injury was received (Southwest). One sample of wheat was diagnosed with common root rot (Red River). One sample of wheat with a physiological purple and yellow discoloration of leaves was received (South Parkland). The sample was of the cultivar Kane and the same leaf discoloration was commonly observed on this cultivar last season. Symptoms are believed to be related to the genetics of the cultivar and a stress reaction of the plant.

One sample of barley with an interveinal leaf yellowing believed to be related to nutritional and wet soil conditions was received (Southwest). One sample of barley showed a leaf spotting at the leaf tips which was found to be abiotic in nature (Pembina). One sample of barley was diagnosed with Septoria leaf spot (Eastman).

Wheat – physiological leaf spot.

Wheat – purple leaf discoloration believed to be a reaction to stress.

Oil Seeds Four samples of canola with group 2 injury were received (Eastman, Red River, South Interlake, South Parkland).

Canola – group 2 herbicide injury can result in development of growth from axillary leaf buds giving the stunted plants a bushy appearance.

Canola – group 2 herbicides can cause the developing pods to appear clustered and bunched together.

Two samples of sunflower showed symptoms consistent with group 4 herbicide injury (Southwest). One sample of flax had yellowing at the growing points consistent with chemical injury (South Interlake).

Sunflower – one symptom of group 4 herbicide injury that may occur is parallel leaf venation.

Bean/Peas/Lentils Two samples of peas were diagnosed with Ascochyta blight (Red River, Southwest). One sample of lentils was found to be affected by anthracnose (Central Plains).

Forage Legumes One sample of alfalfa was found to be affected by Stemphylium leaf spot and Phoma leaf spot (Central Plains).

Fruit One sample of strawberry showed an infestation of two spotted spider mites as well as being affected by Rhizoctonia root rot and iron deficiency (Pembina). One sample of apple with frogeye leaf spot was received (Valleys North).

Vegetables/Potatoes/Herbs Several samples of potato with late blight were diagnosed (Central Plains, South Interlake). One sample of garden beets was diagnosed with Phoma leaf spot (Eastman).

Potato – late blight.

Potato – sporulation of the late blight fungus on the underside of the leaflet.

Trees and Shrubs One sample of ash with anthracnose and ash plant bug feeding injury was received (Valleys North). One sample of oak with a combination of anthracnose and Phyllosticta leaf spot was diagnosed (Valleys North). One sample of oak with anthracnose only was diagnosed (Red River). One sample of Russian olive was diagnosed with Tubercularia canker (Red River). One sample of maple was diagnosed with anthracnose (Red River). A sample of oak, ash and poplar showing symptoms of glyphosate translocation injury was received (Red River). One sample of ash with symptoms of glyphosate translocation injury was received (North Parkland).

Weed Identification One weed sample was identified as pellitory (Southwest).

The Diagnostic Lab Report is prepared by Mardi Desjardins, Crop Diagnostic Centre, Manitoba Agriculture, Food and Rural Initiatives, 201-545 University Crescent, Winnipeg, Manitoba R3T 5S6. Phone: 204-945-7707 Fax: 204-945-4327.

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