When will the csfb larvae pupate?

Discussion in 'Cropping' started by Flat 10, Feb 12, 2019.

  1. Flat 10

    Flat 10 Member

    Location:
    Fen Edge
    And leave my Osr plants and go into the soil? End March? Some are pretty big now!
     
  2. Brisel

    Brisel Member

    Location:
    Dorset
  3. crop looks dire here. fantastic in autumn its now brown and stuffed with larvae. never seen so many, really cant see it performing. To think some get 6.7t/ha ?
     
    Against_the_grain and Flat 10 like this.
  4. Flat 10

    Flat 10 Member

    Location:
    Fen Edge
    So does mine. I would be chuffed get half of that number at the moment
     
  5. Flat 10

    Flat 10 Member

    Location:
    Fen Edge
  6. Brisel

    Brisel Member

    Location:
    Dorset
    Mine has perked up in the last week, with new leaves emerging and the buds visible in the growing point. I do hope it doesn't do this:

    [​IMG]
     
    JCMaloney and Flat 10 like this.
  7. Against_the_grain

    Location:
    Colchester
    Loads of larvae here. Loss of neonics and now metaldahyde mean I am going to admit defeat and give them what they want which is to stop growing osr.
     
    Fromebridge likes this.
  8. robbie

    robbie Member

    Location:
    the brecks norfolk
    I haven't got masses of larvae but you can find some but what i have noticed is that a lot of the smaller ones have died and only the odd big one is still alive, I assume it's the frosts that have done the business.

    As for the look of my rape it's gone brown and yukky looking but it's now moving on with new growth.
     
    Brisel likes this.
  9. robbie

    robbie Member

    Location:
    the brecks norfolk
    Is it normal to see flee beetle adults at this time of year???
    While on my hands and knees today looking at larvae damage I saw a beetle jump from the plant I touched, when I looked closer and moved other plants I saw his friends jumping about.
     
  10. Fromebridge

    Fromebridge Member

    Location:
    Glos
    Where pests are concerned, there are no rules anymore.
     
  11. Flat 10

    Flat 10 Member

    Location:
    Fen Edge
    If the growing point has gone brown and crispy is that it ? Game over for that plant?
     
  12. when tray testing my fert spreader a csfb jumped in the tray
     
    JCMaloney likes this.
  13. Brisel

    Brisel Member

    Location:
    Dorset
    It is possible for the plant to branch out but it depends on how much damage the larvae have done to it.
     
  14. Flat 10

    Flat 10 Member

    Location:
    Fen Edge
    I saw one today :(
     
  15. if they all come out now and then we get a cold mid march will they die out without procreating
     
  16. robbie

    robbie Member

    Location:
    the brecks norfolk
    I've got some plants that have had the growing point/green buds chewed and have gone brown. I assumed it must be csfb but when I've dissected the plant there's no damage in the the main stem so how have they got to the growing point? do They travel up on the outside of the plant. All the larvae I've found on the lower older leaves are still a 1/4 inch from the main stem.
     
  17. Hindsight

    Hindsight Member

    Location:
    Lincolnshire
    If I recall correctly from listening to an ADAS entomologist decades ago larvae can exit a leaf petiole and migrate around a plant on the outside of the plant then burrow in again.
     
    Flat 10 likes this.
  18. robbie

    robbie Member

    Location:
    the brecks norfolk
    Interesting, I couldn't work out how they got to the top of the plant then there was no damage to the inside of a dissected plant.

    Do you know what the criteria is for them to be able to exit and get to the growing point, it could be a real problem.
     
  19. principal skinner

    Location:
    Bedfordshire
    I think your right on that one
     
  20. MrNoo

    MrNoo Member

    Location:
    Cirencester
    Ploughed all mine in, know of a chap who reputedly has written off 1600ac of OSR, wont be growing it here any more.
     

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