Blackleg video quiz for CCA credit

Watch the video and answer the following 10 questions to test your knowledge. If you don't get 10/10, you can take the test again.

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1. What species of blackleg contributes to yield loss in Canadian canola production?

Leptosphaeria biglobosa

Leptosphaeria maculans

Aphonomyces eutiches

Plasmodiophora brassicae

2. Which technology was introduced in the mid 1990s to help manage blackleg?

A biological product that targeted pseudothecia of blackleg in the field.

Early season fungicide product that helped to minimize the disease pressure.

Seed treatments to protect the cotyledons from an early blackleg infection.

Resistant varieties to help provide protection from blackleg throughout the growing season.

3. If your canola variety has the major resistance gene Rlm1, what avirulence gene would it need to interact with to create a hypersensitive reaction?

AvrLm3

AvrLm9

AvrLm1

AvrLm2

4. Major gene resistance in canola will not be able to stop the pathogen when which genes/alleles are present in the blackleg population?

Virulent genes

Avirulent genes

Polygenric genes

Lethal genes

5. How do quantitative genes work to control blackleg?

They work to slow the disease development within the plant. The plant still gets infected because it not a complete resistance.

They work to stop the disease at the initial sight of infection, creating a hypersensitive reaction.

They work together in the plant to provide total immunity from blackleg.

They work to prevent blackleg spore germination from previous year’s stubble.

6. One challenge to disease management is the difference in diversity between the blackleg pathogen populations, and the resistance genes deployed. How do the blackleg pathogen populations compare to the current Canadian resistant varieties being used?

High diversity in the blackleg pathogen population; narrow diversity in resistant varieties.

Low diversity in the blackleg pathogen population; narrow diversity in resistant varieties.

High diversity in the blackleg pathogen population; wide diversity in resistant varieties.

Low diversity in the blackleg pathogen population; wide diversity in resistant varieties.

7. With the adoption/increase of using one major resistance gene, what happened to the pathogen population in western Canada?

Population remained avirulent allowing for the resistance gene deployed to remain effective.

With the intense selection pressure, the population changed species which allowed for Leptosphaeria biglobosa to become the dominant species.

Population became virulent allowing for infection of resistant varieties.

Blackleg resistance genes were inactivated with the plants.

8. Using the 0-5 disease severity scale, what was the decline in yield for every unit increase in disease severity?

27.5%

22.7%

19.6%

17.2%

9. What are the 3 top management practices that need to be used when dealing with blackleg?

Fungicide Use, Scouting, and Crop Rotation.

Scouting, Crop Rotation, and Growing Resistant Varieties.

Growing Resistant Varieties, Major Gene Rotation, and Fungicide Use.

Growing Resistant Varieties, Scouting and Tillage.

10. Having a variety that is labelled as R(BC) means?

Variety has a field testing rating of “Resistant” and has no major genes

Variety has a field testing rating of “Moderately Resistant” and contains major genes Rlm2 and Rlm3

Variety has a field testing rating of “Resistant” and contains major genes Rlm2 and Rlm3

Variety has a field testing rating of “Resistant” and contains major gene Rlm1

Quiz

Blackleg video quiz for CCA credit

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