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This topic contains 4 replies, has 0 voices, and was last updated by  Jason Horner 10 months, 3 weeks ago.

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  • #2777

    adamyork
    Member

    Anybody struck with this yet? Blowing a big whole in our brassica plan right now and seemingly worsening across the UK

    https://www.dekalb.co.uk/news-and-events/clubroot-challenge-grows.

    We’ve never dealt with iffy Born levels and I’m not clear how critical this is.Any thoughts?

    #6073

    adamyork
    Member

    From more reading getting pretty sceptical about transmission physically Eg machinery,boots.Seems more likely to be endemic on much land.Maybe far more critical as to whether conditions suit it’s spread or not (like so many weeds in the soil seedbank).Biological interactions seem little understood despite much Canadian work since their OSR crisis of recent years.Certainly the point about 15degreeC/warmer Winters should make us all nervous and monitoring pH/Calcium levels.Growing below pH 7 may have become relatively risky,long rotation or not.

    #6074

    Jason Horner
    Member

    Hi Adam, had problems here in our early years as our starting pH was 5.2 but mainly with crops that were in the ground a long time eg sprouts and PSB other brassica crops seemed less affected. At one stage I took a two year complete break in the brassica rotation and then went back three years in the rotation so effectively a five year break in crop. This seemed to make a difference but I never went back to sprouts or PSB. My pH is now 6.0/6.5 and boron would be low on soil samples and I havent limed for about ten years. Kale, calabrese, turnips and cabbage all seem to be OK these times. Would imagine a low boron level would not help plants especially brassicas but not sure that having good levels would make much difference to clubroot apart from strengthening the plant some bit. 

    #6081

    I agree with Jason.Have had clubroot for many years now (through using imported compost from unknown source,doh).At first tried to maintain high hygiene levels after first spotting initial infection. but impossible really.

    I do manage to grow PSB though some plantts are affected. Have given up on sprouts& cabbage. Again some turnips and calabrese affected, but still sellable. Not done any boron checks, but could be affecting 1st heads of calabrese I check pH levals every year in all plots

    #6132

    adamyork
    Member

    With our new found paranioa about brassicas and clubroot been thinking a bit more about Watercress(a brassica)and salad brassicas.We have previously taken the common view that particularly on intensive,composted beds that salad brassicas could escape normal rotational constraints,feel less sure about this now.Watercress which most growers seem to be ignoring(despite it being the most profitable crop….),is something we also need to be clearer about rotational issues.Any thoughts on this?

     

    #6134

    Jason Horner
    Member

    Hi Adam,

        Think it all depends how long plants are in the ground, generally find that rocket mizuna etc. is only in the ground for maybe two or three months and doesnt seem to pick up clubroot badly in that period. Generally when I grow these in a tunnel I try to follow with spincah or lettuce or any non brassica crop, that way you are not giving the disease chance to get established in that soil. I dont rotate religously in the tunnels because its too complicated but would try to avoid planting brassicas over a long period in a tunnel. Outside I have found a five year rotation to be sufficient but am careful about varieties and dont grow PSB and sprouts.  

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