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  • Leek pest?

    Hello all

    My leeks were rubbish so I cleared them up today. and planted some tulips and pansies instead... meanwhile, while I was sorting through the big bag of leekiness I'd collected to see what I could salvage before composting the rest (enough odds and sods for leek and potato soup, and three more usable leeks, for another leeky dinner later in the week) I noticed some little caterpillar-y things in there and wondered if it was a pest that was troubling them. I had assumed it was the weather to blame for doing them in but am not so sure now!

    The caterpillary things I saw were very thin (say about 1mm thickness) and maybe 2cm long, and medium/dark brown. It seemed able to spin a bit as one of them was dangling from a handle on the bag. I also saw, actually on the leaves of the leeks, a few things I thought might be pupa, about 1 to 1.5cm long, only 3-4mm wide and if I remember rightly they were a silvery-brown colour. The symptoms on the leeks were - lots of leeks with wilted / brown leaves, some of the leeks were very soft, possibly rotting but not at the base only on the wilted parts or the outer leaves, sometimes as far down as the base but only a few were soft / rotting actually below soil level. They all had good healthy root systems, it was above ground that the plants were suffering.

    Any ideas?

    Thanks!
    Warning: I have a dangerous tendency to act like I know what I'm talking about.

  • #2
    Leek moth? I've never had it, so I don't know what it looks like, but a quick Google brings up a lot of stuff.
    Royal Horticultural Society - Advice: Leek Moth

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    • #3
      Originally posted by SarzWix View Post
      Leek moth? I've never had it, so I don't know what it looks like, but a quick Google brings up a lot of stuff.
      Royal Horticultural Society - Advice: Leek Moth
      I don't think so - they have greenish yellow caterpillars from what I can find out whereas my culprit is brown all over. And allium leaf miners have cream / white larvae so it's not them either. Have googled but it doesn't seem to be any of the usual suspects. Sigh. (Thanks anyway...)
      Last edited by Demeter; 26-10-2008, 08:41 PM.
      Warning: I have a dangerous tendency to act like I know what I'm talking about.

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      • #4
        Leek Moth: The caterpillars are yellow-green in colour with grey-brown patches and a yellowish brown head.
        Mature caterpillars are up to 13mm long.
        Caterpillars pupate in white silk cocoons found within the foliage. They contain the reddish-brown pupae.
        All gardeners know better than other gardeners." -- Chinese Proverb.

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        • #5
          Try searching for 'cutworms' as that' the proper name given to some larvae and caterpillars of moths.

          See here for more info:

          Cutworms

          Regards

          Neil

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          • #6
            Forgot to say it's an american site, but the info is basically the same.

            Neil
            Last edited by plantsbypost.com; 27-10-2008, 09:07 AM.

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            • #7
              Thanks for that - I've inspected all the images google can throw at me now for leek pests, cutworms, you name it - none of them looked remotely like mine. They were very nondescript little thin brown larvae/caterpillar/cutworm things, you wouldn't think they could be so hard to ID!

              This image is what my leeks looked like (only mine were worse and these are in fact onions), and worryingly it is an image of white rot damage - however i didn't see anything horrible on the base or roots, the roots all looked exceptionally healthy and the bases were a bit soft here and there but mostly sound - so I don't think it's that (phew)

              Conclusion: some unidentified pest, or possibly a disease, or maybe just rubbish weather...

              Warning: I have a dangerous tendency to act like I know what I'm talking about.

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              • #8
                http://www.defra.gov.uk/planth/pestn...ium-notice.pdf - Have you seen this little beastie ?

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                • #9
                  Only on the internet!
                  Warning: I have a dangerous tendency to act like I know what I'm talking about.

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                  • #10
                    Originally posted by Tam View Post
                    http://www.defra.gov.uk/planth/pestn...ium-notice.pdf - Have you seen this little beastie ?
                    Yep...we got it on our site and most of the west midlands. We have to cover our alliums with fine mesh or plant after april.
                    Someone on our site reckons that there is an insectcide that will help and some of the plot holders are giving it a try.
                    If it works I'll let everyone know coz this little blighter is going nationwide sooner or later.

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                    • #11
                      Just found this:
                      The best methods of controlling P. gymnostoma in a private garden or on an
                      allotment would be to use a combination of measures including,
                      • removal and burning of infested plants. Infested plants should not be
                      composted since eggs, larvae and pupae could continue to develop
                      with adults emerging to disperse and infest available hosts,
                      • covering Allium with fleece in late February. This will inhibit newly
                      emerged female flies from finding a host on which to oviposit,
                      • delaying planting of Allium spp. until after April when the principal peak
                      in adult emergence has passed. Late maturng varieties of onions are
                      available which will help make this possible,
                      • rotation with non-Allium spp.,
                      There are only a few chemical options for pest management in private
                      gardens and on allotments, i.e. “Home and Garden” products. They are nonsystemic
                      sprays with active ingredients based on rotenone and pyrethrins.

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