Wild oat chemical resistance

Discussion in 'Direct Drilling Crops & Agronomy' started by kiwi, Nov 13, 2017.

  1. kiwi

    kiwi Member

    we have developed chemical resistance to wild oats and the only option in barley is a mix of either avadex and Triflur or just avadex. We have been using the Dale seedhawk drill since 2003 and the problem being New Zealand don't have registration for granulated avadex for no or low tillage. It would be a sad day if we need to go back to minimum tillage!!
    My question is , do farmers in the u.k or Europe have wildoat resistance issues and does going to very low disturbance drills and using covercrops ,reduce the need for chemicals?
  2. shakerator

    shakerator Member


    ALS or ACCASE or both?

    is it pinoxiden resistant too?

    no generally not the issue here
  3. kiwi

    kiwi Member

    Yes Pinoxaden resistant and all the chemical group A that end in fop or den. We have hopefully relief in wheat with Dow agro Rexade but seems to take two applications. Our neighbours that are minimum tillage had the trouble first and spread from there. They are getting on reasonably well with a mix of treflan and avadex but of course they burn their straw mostly. Scary when we become solely reliant on chemicals in notillage. We have a diverse range of break crops but of course Haloxyfop-p is resistant as well.
  4. shakerator

    shakerator Member

    We have broadway star that includes pyrosulam. I am surprised you have resistance to axial
  5. Happy

    Happy Member

    How did that happen?
    Too low rates for too long?
    Scary right enough. No resistance problems here yet but also no burning or Treflan available should it become an issue.
  6. Broadway Star or Atlantis for you.

    ACCase resistant oats are ten a penny here.
  7. Will Blackburn

  8. kiwi

    kiwi Member

    . Possibly it was from 3/4 rates being used but also the scientists believe we have what they call a slender wildoat which is slightly different to the standard wildoat.
    I have wondered if we treated them more like your Blackgrass with very low disturbance at drilling and plenty of cover , if we could reduce the germination of them?
    Happy likes this.
  9. Douglasmn

    Douglasmn Member

    Can't beat a rogueing gang for wild oats. Are you on too big an acreage for this to be practical?
    ollie989898 likes this.
  10. kiwi

    kiwi Member

    The patches of wild oats are to thick for rogueing to be practical. We have tried this but you can't get all the wild oats and damage to much of the crop. If there was just a wid oat here and there it would be practical. In hindsight we should have round upped the patches when they were smaller .
  11. phil

    phil Member

    Do you have IPU
  12. Badshot

    Badshot Member

    Avadex is supposed to be very good for wildoats. Can be used on barley and wheat.
    Isn't there a liquid version again?
  13. kiwi

    kiwi Member

    We have used IPU in the past in a mixture with diflufenican to target other weeds but never knew it had suppression activity on wild oats. We did have to still spray with a specialised wild oat spray though. Thanks for the idea I will investigate some more.
    We have liquid avadex as I said but need to incorporate it here to be effective. Do you apply differently the liquid?
  14. Wheatseeker

    Wheatseeker Member

    IPU/Treflan pre emergence of the wild oats should work. As for Avadex the granular formula was developed after difficulties with incorporating liquid Avadex and the associated crop side effects. Its much safer even if it more difficult to apply.
    Wild oats here have largely been forgotten about due to the amount of chemistry that has been thrown at blackgrass. As most of it is pre em and has been followed with Atlantis type products that were good on wild oats, they largely disappeared. However I have noticed more spring germinating ones cropping up now that we don’t do a spring Atlantis anymore.
    Have you got Dagger? Been a while since it was available here, but it’s another chemical class.
  15. kiwi

    kiwi Member

    Thanks Wheat seeker. How have you got on with pre emergence sprays with lots of straw on top with notill?
    We have tried treflan but have mixed results in notillage situation, even though the seedhawk throws a bit of soil around. We could use treflan and avadex in minimum tillage situation but trying to avoid that.
    What is the chemical in Dagger? Can't seem to find it on google.
  16. Wheatseeker

    Wheatseeker Member

    Dagger is/was imazamethabenz-methyl.
    Brisel likes this.
  17. Audlem Agron

    Audlem Agron New Member

    You have some useful chemistry Vs Oats. I would suggest looking at broad leafed spring breaks to diversify the actives you can use - try and get as many glyphosate sprays in as you can. Cultivation plays a big part in perpetuating Oats. Try not to move soil. keep the Oat seeds on the soil surface so they are fully exposed to Avadex.

    One successful tactic I use is to use the following rotation :-
    Cover crop into spring beans
    Cover crop into spring linseed
    Winter cereal
    Winter cereal
  18. kiwi

    kiwi Member

    Thanks Audlem. We have a break crop every three years and run some covercrop as lamb grazing over winter. You sound like you are stacking your rotation which may well be what we need to do. I don't think our liquid avadex will work in the notillage situation with lots of cover on soil but your experience may be different?
  19. Audlem Agron

    Audlem Agron New Member

    Hi Kiwi, the spring crop strategy opens up the opportunities for glyphosate and can quadruple the chances to get it on which over two seasons drastically reduces the populations of problem weeds. If you don't cultivate, so any seed is left on the surface, the results are even more dramatic as the weed seeds have three lifestyle choices - germinate, rot or get eaten. They usually choose to germinate, so we get a quick flush with no dormancy and nothing hiding in the soil, so we take much bigger chunks out of the population with much cheaper chemistry.

    Re the liquid Avadex, Id get that on the day the drill is in the field, after rolling. Its a bit too erratic in its performance for me though - but if its what you have try and get all the factors that make it inconsistent right (seed bed, timing, moisture, water volume of application etc) and go for it.

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