Call us: 1.877.420.2099
  • Subscribe to Our Newsletter
20/20 Seed Labs Inc.20/20 Seed Labs Inc.20/20 Seed Labs Inc.20/20 Seed Labs Inc.
  • Home
  • About Us
    • Our Goals
    • History of 20/20
    • Our Team
    • Our Qualifications
    • Customer Reviews
  • Services
    • Seed Testing
    • Seed Crop Inspection
    • Research
    • Seed Grading Services
    • Training & Consultation
    • Seed Import Release Services
    • Specialty Services
    • ISTA Program
    • Online Forms
    • Testing Packages
    • Terms of Service
  • Learning Centre
    • News
    • Events
    • Tech Bulletins
    • Videos
    • Newsletter Archives
  • Contact Us
  • LOG IN
  • SIGN UP
  • SUBMIT A SAMPLE

What Causes Alternaria Black Spot in Canola?

    Home Tech Bulletins What Causes Alternaria Black Spot in Canola?
    NextPrevious

    What Causes Alternaria Black Spot in Canola?

    By 20/20 Seed Labs | Tech Bulletins, Tests for Common Diseases | Comments are Closed | 10 May, 2017 | 0
    print
    Alternaria black spot, also known as grey leaf spot, is caused by three species of the Alternaria fungus:

    • Alternaria brassicae
    • Alternaria raphani
    • Alternaria alternata

    Why Does it Matter?

    • Alternaria is widespread on a large variety of plants and attacks the stems, leaves and pods of canola.
    • Low levels of fungi are found in most canola fields, but cause little damage unless moisture and temperature conditions are favourable for disease development.
    • Alternaria black spot can strike at all growth stages in particular, at early stages when infection can quickly build up and result in severe disease levels and eventually plant death.
    • Losses: Infection during podding and ripening can reduce yields by causing premature shattering, and reduce grades by causing higher green seed, chlorophyll content, shriveled seed and reduced oil content.

    What are the Symptoms?

    Early season:

    • Infected seed will produce seedlings with small dark spots on the cotyledons.

    Mid- to late season:

    • Grey to black spots on stems, leaves and pods.
    • Severe spotting causes leaves to wither and die and can also cause floret abortion.
    • Premature ripening of heavily infected plants; pod splitting.

    What is the Disease Cycle?

    • Alternaria fungi overwinter on seed, infected crop debris and on related (cruciferous) weeds, such as flixweed, mustards and stinkweed.
    • Spores are produced in the infected plants or crop debris and are spread by wind, rain and insects to other plants, where they remain until conditions turn warm (15o C to 20o C) and humid.
    • When conditions are right, the spores germinate and penetrate the plant surface, causing lesions to form within a few days.
    • These new lesions produce more spores for distribution by wind, rain and insects.
    • Seed can become infected through lesions on the pods or through spore contamination in the combine.

    How is it Controlled?

    • Use clean, high-germinating, disease-free seed.
    • Follow a minimum three-year canola rotation.
    • Control volunteer canola and cruciferous weeds.
    • Bury infected stubble.
    • If the disease does occur, apply fungicides to protect yield potential.

    How Does 20/20 Seed Labs Inc. Test for Alternaria Black Spot?

    • 200 seeds are put on culture agar and incubated for 7 days.
    • A qualified staff member examines the plates for the presence of Alternaria spp.; identification is made by the color and shape of the spores produced.
    • This test tells you the percentage of infected seeds to 0.5%.
    • If individual species of the fungus need to be identified, we can do that for an extra fee.
    • This test takes one week to complete.

    Please contact us for more information.

    No tags.

    20/20 Seed Labs

    More posts by 20/20 Seed Labs
    NextPrevious

    Video Series

    • 20/20 Talks – Learn about seed issues
    • Understanding the Results of Your Seed Analysis Report
    • Events from Around the World
    • View All Videos

    Tech Bulletins

    • Critical Testing Packages
    • Fusarium
    • Germination Laboratory
    • Molecular Laboratory
    • Reporting and Results
    • Rhizobium Tests / Nodulation
    • Tests for Common Diseases
    • View All Tech Bulletins

    Online Forms

    • Online Forms
    • Flax Sample Testing Form
    • View All Online Forms

    Resources

    • Provincial Agriculture
    • Crops
    • Regulatory Authorities and Associations
    • View All Resources
    20/20 Seed Labs, Inc.

    We are a global provider of superior seed testing services that includes all aspects of purity, germination and seed health.

    We are accredited by the Canadian Food Inspection Agency (CFIA), Canadian Seed Institute (CSI), ISO 9001 certified and the only private lab in Canada accredited by the International Seed Testing Association (ISTA).

    ISTACSICSAAC
 class=SCSTISSS

    ABOUT 20/20

    • Who We Are
    • History of 20/20
    • Our Qualifications
    • Our Goals
    • News & Learning Centre
    • Customer Reviews
    • Contact Us

    SERVICES WE OFFER

    • Send Us a Test Sample
    • Seed Testing
    • Research
    • Crop Inspection Services
    • Training & Consultation
    • Seed Grading Services
    • Specialty Services

    CONTACT US

    Alberta
    507 – 11 Avenue
    Nisku, AB
    T9E 7N5
    Phone: 1-877-420-2099

    Manitoba
    3489 Pembina Hwy
    Winnipeg, MB R3V 1A4
    Phone: 1-204-261-3755

    AIR MILES® Reward Miles
    ®™ Trademarks of AM Royalties Limited Partnership used under license by LoyaltyOne, Co. and 20/20 Seed Labs. Inc.
    Copyright © 2018 20/20 Seed Labs Inc. All Rights Reserved. Privacy Policy
    • Home
    • About Us
    • Services
      • Seed Testing
      • Crop Inspection Services
      • Research
      • Seed Grading Services
      • Training & Consultation
      • Seed Import Release Services
      • Specialty Services
      • ISTA Program
      • Testing Packages
      • Online Forms
      • Terms of Service
    • News & Learning Centre
    • Login
    • Sign-Up
    • Submit a Sample
    • Contact Us
    20/20 Seed Labs Inc.