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Orchids and Scale - out with the old?

This is a discussion on Orchids and Scale - out with the old? within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Hi all... This past Saturday, I woke up like an overly excited puppy because I ...

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  1. #1
    cakedaddy's Avatar
    cakedaddy is offline Senior Member
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    Default Orchids and Scale - out with the old?

    Hi all...
    This past Saturday, I woke up like an overly excited puppy because I was going to the Pacific Orchid Expo in San Francisco. I had moved my cymbidium from the front porch to the back deck the night before so it could get a bit of rain. When I went out for my morning "air", I was fiddling around with it and found TONS of scale! Long story short, it's a bad infestation. I don't think its worth the risk to treat it and keep it going. It's a huge plant and I can't possibly go through the leaves by hand and I can't keep it isolated long term...Should I treat my more valuable plants just in case? I have malathion and the bayer rose product. From what I found about scale reading online, it is the boisduval scale. Trash it and treat others? This is my first pest problem.

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    Daethen is offline Senior Member
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    I opened a thread about scale a while back. I don't know if you read it. I bought about 40 plants from someone who was downsizing their greenhouse. They were infested!!!! I made up a plastic tub of malathion and dunked every plant. I let the media soak in the tub (in the pot) for about 5-10 minutes then baptised the foliage until I knew every nook and cranny was wet. Did it again a week or so later. I did use alcohol to wipe off what I could see, but that was just so I didn't see the dead ones. Haven't had a single one show up again. I feel this was easier than repotting and trying to wipe off all the leaves and for me it worked!

  3. #3
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    Once scale gets a foot-hold in your collection, it is really hard to get rid of it. My advice: Clean that plant really well or consider growing it well away from your collection.

    Cheers,
    BD

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    Daethen, I have read every thread I could find here that was related to scale. Then I googled and read everything I could find about scale elsewhere. The plant is just so large, I don't really think I could clean it well enough and the only area I have to keep it in that is away from the other plants could expose my neighbors children and pets to the chemicals if I treat it. I am really more worried about the other plants...they are much more valuable to me on both monetary and personal levels. I just don't really know if I should treat them preemptively. Thanks for the responses guys!

  5. #5
    tcatl is offline Member
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    I have a relatively new plant that apparently came with scales. It was fine at first, then covered in brown bumps. I really got to know my plant and pamper it as I washed the leaves by hand. The problem now is that they showed up after we moved, and I have found them on my huge Monstera! The only time these two plants could have come in contact was during transport in the back of my car. I need to keep my eyes out for any more that came in that trip to develop bugs.
    It does take time and patience to clean all the leaves, but for me it is calming to "pet" my plants. Take a partner out to the portch with you and relax as you clean the plant. And dont forget to treat for the ones you can't see (something I've been meaning to do to mine...). Good luck!

  6. #6
    Michael Saar is offline Senior Member
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    I have battled scale over many years with many products; the best control (with the least effort) I have found recently is Bayer Advanced Tree & Shrub granules. I have virtually eliminated scale from potted orchids in my greenhouse. Application rate was 1 teaspoon/6" pot scattered on the media, adjusted by pot size volume for other sizes. It takes a month or so to take effect, and you will still have to deal with mounted plants some other way. I have seen the Bayer Rose product mentioned by others in this forum; a quick comparison of labels shows that the Tree & Shrub granular product has a higher insecticide concentration and lower fertilizer analysis than the Rose product.

  7. #7
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    Jason, I hear what you are saying about it being too big to treat confidently. If it were me, I might take a small division of it to treat & keep and toss the rest. And, I think I would preemptively treat the rest of the collection.

  8. #8
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    One word systemic ! I would spray the plant with a quick kill then apply the systemic I use the Bayer Tree and Shrub or the Soil and Turf .

  9. #9
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    Quote Originally Posted by Gin View Post
    One word systemic ! I would spray the plant with a quick kill then apply the systemic I use the Bayer Tree and Shrub or the Soil and Turf .
    I would agree for a large plant like this if you decide to treat it.

    Susan

  10. #10
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    I would definitely treat it with a systemic. I have had the best luck with Imidocloprid or another product that used to be called Isotox. The Isotox stinks to high heaven, the Imidiocloprid can be found in several products, PM me if you want some names.

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