Stripe rust spread slowing, spring wheat fields most affected

Pest surveillance branch update August 7, 2014

Stripe rust spread slowing, spring wheat fields most affected
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Mike Harding, AARD – Twenty-four spring wheat fields were surveyed for stripe rust in the Lethbridge, Warner, Taber and Forty Mile counties of southern Alberta. The continuing hot, dry weather has generally slowed the spread of the disease.

Among spring wheat fields surveyed, stripe rust was observed in 58 per cent with average stripe rust levels occurring at levels of trace to 2 per cent. However some local hotspots, particularly in the Coaldale region of Lethbridge County, were observed with severities ranging from 15 per cent to 60 per cent. The majority of spring wheat fields are beyond the developmental stage for risk of stripe rust although a few of late-seeded spring wheat fields surveyed were still in the seed development stage. As crop ripening progresses, the risk of yield and quality losses due to stripe rust in spring wheat decreases.

Weekly surveys for stripe rust will continue until the end of the growing season.

Producers should be considering winter wheat options for this fall. Radiant is susceptible to stripe rust and should be replaced with newer, stripe rust resistant varieties. For traditional dryland regions in western Canada, the variety Moats is a good choice. For irrigated production and in parkland regions, Flourish or  AAC Gateway are recommended. All three have stripe rust resistance and exhibit similar levels of winter hardiness.

Goss’s Bacterial Wilt and Leaf Blight – 2014

Goss’s wilt and bacterial leaf blight is a new disease on corn in Alberta. The disease was confirmed on corn in southern Alberta for the first time in 2013.

Goss’s wilt and bacterial leaf blight has again been reported on corn in southern Alberta this year (2014). Alberta Agriculture and Rural Development would like to monitor the occurrence and distribution of Goss’s Wilt. If you see any suspicious symptoms, please contact Mike Harding. See the attached Information Sheet and Sample Submission Form for more information.

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