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  • 1 Post By Dorsetman

combining neem oil & malathion

This is a discussion on combining neem oil & malathion within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; HI, guys...I have a question for the entire board. In dealing with a scale infestation, ...

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  1. #1
    remo is offline Senior Member
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    Default combining neem oil & malathion

    HI, guys...I have a question for the entire board. In dealing with a scale infestation, have any of you ever combined neem oil and malathion together? And if you have, what were the results?
    I ask because I have a bit of a problem with a group of cyms and a scale infestation and like the idea of neem for its sticking properties and of course malathion for its scale death properties. What do you think?
    Remo-looking forward to your experience and your ideas...Thanks!

  2. #2
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    Zozzl is offline Senior Member
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    I haven't combined them, but I have burned some of my leaves using malathion this summer. Some of the plants are sensitive to it in the heat and it can leave awful marks on the leaves.

    A grower told me of a producet called "Distance" that works great on scale but it is very expensive.

  3. #3
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    I've used an organic spray (expensive) that I get at the garden center, it's worked just fine and the cym had no residual issues with it. - martha

  4. #4
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    Malathion is now banned in Europe - at least for amateur use, and has been for many years. I used it some years ago on Phalaenopsis and found that they went blind - produced a spike instead of a leaf at the crown of the plant, and never grew another leaf, and general discussion with other growers at the time produced agreement about that.
    As to Neem, its insceticidal effect is on contact and it is effect that way for quite a short time (minutes) ; otherwise, the oily part remains and works by blocking the spiracles in the insect - those are the tiny hioles which allow oxygen to pass into the body of the insect - they don't breathe through the mouth the way we do . So any oil will do that job, e.g. corn oil ( a lot cheaper) but again it has to be contact to work.
    In general mixing two different products together is a risky thing to do , withuinlknown consequences - Look for books on orchid growing by Bob Gordon - he is very good on this subject and has a proper scientific approach ; I am sure you will find him tell you not to do it - miox two things.
    But if you must do it, remember that if you mix up a gallon of malathion at the full strength , and then a gallon of Neem likewise at full strength, , and add them together - both will be at half strength !

  5. #5
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    I would say a definite NO. I have found that Neem oil causes my Cattleya and Paphs to have yellow spots and patterns on their leaves. Malathion alone should be sufficient with some insecticidal soap or plain dish washing soap as a surfactant for better wetting and sticking properties. Malathion should not be used on Phalaenopsis though.

  6. #6
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    I have used both separately, but never in the same sprayer. Why not try it out on a sample to see what the results will be?

    cheers,
    BD

  7. #7
    remo is offline Senior Member
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    Thanks everyone...I'll take all advice under consideration and try to figure this thing out. Thanks, again!
    Remo

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