Canola Watch

Additional Photos Required for Canola Diagnostic Chart for Pre-emergent Seedling Mortality

Email to:maykoj@canola-council.org
OR
Mail to:Diagnostic Photos
400-167 Lombard Ave.
Winnipeg, MB
R3B 0T6
  1. Mushy seed with signs of initial germination (cracked seed coat, radicle emergence)
  2. Mushy seed without sprouts (signs of seed rot)
  3. Seedlings seeded deep > 2" with signs of seedling blight.
  4. Seed mixed with straw/chaff residue in the row.
  5. Seed mixed in straw/chaff piles (signs of poor residue management)
  6. Straw hairpinning with seed (with disk openers)
  7. Fertilizer granules mixed with seed (signs of poor fertilizer/seed separation, worn openers or too fast seeding speed))
  8. Coarse, dry seedbed caused by untimely pre-seeding tillage
  9. Uneven seed placement within the seed row (may be caused by high seeding speed or uneven seed depth)
  10. Seedlings un-emerged due to soil crusting.
  11. Better emergence in wheel tracks (caused by dry, cold, coarse, unpacked soil or deeper seeding away from the tractor wheel tracks.)
  12. Seedlings with brown/withered hypocotyls or roots browned/pruned
  13. Seed germinated then stopped with short root/shoot sprouts (<1/2") with 3 scenarios
    1. Roots branched, white hypocotyls, turgid white- may be sign of poor vigour
    2. Roots lacking, hypocotyls white to purple- may be pythium
    3. Roots branched and healthy, hypocotyls with brown discolouration- may be rhizoctonia, fusarium
  14. Plants with shredding damage (may be wireworms or cutworms)
  15. Repeating pattern of poor emergence matching rows or sections of implements. (may be from uneven seeder depths across the seeding machine or from sprayer overlaps/misses from previous years)
  16. Twisting/cupping of leaves, normal colour, thick stem/base (may be caused by Group 4 residues)
  17. Wind erosion damage of seedlings
  18. Gopher damage
  19. Yellow/purple seedlings with green growing point (caused by recent excess soil moisture/flooding)
  20. Plant injury mainly on hilltops (may be caused by wireworms/cutworms/gophers or herbicide injury)
  21. Plant injury mainly in low areas (may be caused by excess soil moisture or herbicide residue)
  22. Plants growing between seed rows (check for signs of seed treatment)- may be caused by high seeding speed, (no signs of seed treatment- likely volunteers from previous years)
  23. Plants with random herbicide damage- may be caused by susceptible plants within the seed-lot, most likely with HT varieties)

THANKS!

Spring 2005


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