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  • 1 Post By clintdawley

Scale on Cattleya in Europe/UK

This is a discussion on Scale on Cattleya in Europe/UK within the Genus Specific forums, part of the Orchid Culture category; Hi Folks, I'm posting this to see what approaches different people take in Europe/the UK ...

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  1. #1
    Nathanb is offline Junior Member
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    Default Scale on Cattleya in Europe/UK

    Hi Folks,

    I'm posting this to see what approaches different people take in Europe/the UK to deal with this annoying little blighter seeing as most of the decent synthetic insecticides are now banned for us (our US friends have it easy on the insecticide front)! I've been battling a scale infestation for a number of months (annoyingly kept thinking it was gone only for it to pop up again)

    Unfortunately my Cattleya collection is too large for softer treatments such as Neeam oil etc and I've got too many (and am too attached to a lot of them or they'd be too expensive to replace for me to even consider starting to pitch the infected ones) so synthetic insecticide is the only option - a few really infested plants have gone in the bin, but not many.

    I finally seem to be getting on top of it thanks in no small part to one of the Orchid nurseries in the UK giving me some very good advice. On their advice I've done it by using a combination of bug clear ultra (acetamiprid) and provado ultimate bug killer (thiacloprid) (the local garden centre must have thought I was mad when I walked in and bought 5 bottles of each!). I've been working on a 2 week cycle over 8 weeks:

    Session 1 the plants were taken out one by one, hosed off with one of the insecticide (I also mixed 10 ml per litre of horticultural soap with the insecticide mix) - all parts of the plant sprayed off and then the pot dunked in a vat of the stuff and left to 'water' for 10-15 mins (I purposely didn't water them for 3 weeks before this so they'd have a good drink - some of the plants had scale all over the roots, which is something I've not seen before, have included a photo of a L tenabrosa whose roots were covered), all surfaces and walls of the greenhouse, plant trays etc were sprayed off as well.

    Session 2 the other insecticide was used to mix things up a bit, I think on inspection about 15 out 200 odd Catts/Laelias still had visible new Scale with crawlers on them, I didn't dunk them this time, just took them out one by one and sprayed them off making sure all leave and pseudobulb surfaces were wet

    Session 3 I repeated the process from session 1 etc, that's where I'm up to at present and only 5 plants today had scale insects visible on them, so I seem to be getting somewhere.

    I'd be interested to know if any other Cattleya enthusiasts (who are working under the same insecticide constraints that I am) have an easier way of dealing with it as it is a very long drawn out, frustrating and time consuming process!

    Thanks

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  2. #2
    cucubirds is offline Senior Member
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    Default

    Sorry, I don't know if you like my idea or not. If there are too much scale on roots & your plant is healthy, I would cut off the roots and discard old media & pot as I'm afraid there might be some leftover of scales even if repeatedly spraying. Then spray with white summer oil/neem oil as a preventive measure.

    Or just stick to the session your currently on till all scales disappear.

  3. #3
    ksriramkumar is offline Senior Member
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    Sorry to hear the magnitude of scale infestation. would a 50:50 isopropyl alcohol and water jet spray help?.

  4. #4
    plucker is offline Member
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    I found the only way I could control it was using a chemical with active ingredient imidacloprid. - Confidor in my case but not sure what is available for you.
    It has 15g/l ingredients and I used 6.66ml/L for 3 consecutive weeks. It is systemic and I spray on all leaves and inside the pot.
    You have to be persistant to break the cycle. I would guess that fortnightly spraying is not stopping the cycle.

  5. #5
    Nathanb is offline Junior Member
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    Thanks Plucker, unfortunately imidacloprid is banned in the EU so that's not an option - thiacloprid, acetamiprid and cypermethrin are the only options. I hear what you're saying though about fortnightly not being enough - at the minute I'm alternating the 2 insecticides every fortnight, I think I'll try weekly and see where I end up! It does seem to be getting better slowly but surely, just very very frustrating!

  6. #6
    78Terp's Avatar
    78Terp is offline An Avant Gardner
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    So sorry to see/hear of your scale infestation. I hope to never have your experience with scale. I will now be far more vigilant in my inspection of new additions looking for this critter in particular.

  7. #7
    clintdawley's Avatar
    clintdawley is offline Wrapped in metal..wrapped in ivy...
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    I pour straight neem oil in my hands and work it over the surface of the scale. I leave it for a day or two (plant in pretty heavy shade) and then rinse off...

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