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greenhouse under attack!!!

This is a discussion on greenhouse under attack!!! within the New Growers: Ask the Senior Members forums, part of the New Growers category; Hi everyone! I am so depressed. I think my greenhouse is under attack by I ...

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  1. #1
    dukejenn's Avatar
    dukejenn is offline Senior Member
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    Jennevie Shih
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    Greenhouse
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    Phalaenopsis, Vanda, Cattleya
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    Default greenhouse under attack!!!

    Hi everyone! I am so depressed. I think my greenhouse is under attack by I don't know what...I suddenly found out these past two weeks that my orchids are sick, first the phals then next the dendrobiums, then next my sanderiana, now even my cattleyas!!! I can't really identify what's happening thou i searched for infos but still i found different things in my plants. Please help!!! I really do appreciate any advise. Thanks is advance. I'm posting pictures

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  2. #2
    dukejenn's Avatar
    dukejenn is offline Senior Member
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    Jennevie Shih
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    additional photos...
    Attached Images Attached Images   

  3. #3
    Halloamey's Avatar
    Halloamey is offline Senior Member
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    Amey Bhide
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    Looks like systemic fungal infections and also viral infections. For the fungus I would recommend using captan or any systemic fungicide. Spray weekly for a few months. For the virus, there is not much that can be done, but you could try using Ribavirin at 300 mg/litre water as a foliar spray, it is known to cure virus infested citrus and many other plants. (Ribavirin is a antiviral used for treating flu in humans so, it should be available at the chemists.)

  4. #4
    dukejenn's Avatar
    dukejenn is offline Senior Member
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    Jennevie Shih
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    Thank you very much for you advise! It's fungicide! It's summer here now and I think the place seems to be dry always and still they got fungicide!!! May I know which picture/plant that seems to be has viral problem? I think I need to segregate it first. Thanks!

  5. #5
    catttan's Avatar
    catttan is offline Senior Member
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    Yew-Sung
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    Glad Halloamey has responded to your cry for help. He did a great job by recommending Confidor (imidacloprid) when I had a bad infestation of thrips and this has taken care of the problem.The second photo shows infestation by spider mites and I suspect the dendrobiums too. Halloamey may be able to recommend some miticide. I think you will have to spray all your plants since the whole greenhouse seem to be affected.The use of Ribavirin sounds very interesting.
    When you have the mites under control make sure to wet the underside of your plants , particularly phals and dendrobes, when you water the plants. This will help to keep the mites at bay.This is a tip from a commercial grower who has acres of orchids.I have no more problems with mites after following this advice.

  6. #6
    dukejenn's Avatar
    dukejenn is offline Senior Member
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    Jennevie Shih
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    Phalaenopsis, Vanda, Cattleya
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    Thank you very much for the time to help me with this. This is the first time ever I encountered problem this big!!! I can still have fungicide if it's for fungal infection, but for viral, i read somewhere that the plant must be thrown away....therefore i was quite sad to know that there is a possibility of viral infection too...just this morning i found out that i got lots of infected leaves with my dancing ladies too...really the whole greenhouse is infected. so sad...i cut out all the leaves that are infected...so heartbreaking to see all those leaves on the floor...but Im trying to save my whole collection.

    May I ask a following question? How can I identify viral infections? I really dont know which plant has viral...thou the phals and dendros i think they're under fungal and mites attack...

    Really appreciates all your help Halloamey and Catttan! Thank you very much!

  7. #7
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    walingwaling is offline Senior Member
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    hi, i can relate to those false spider mites problem, which you clearly have on your phals. thats the easy part, spray a mix of soap and alcohol (70%), maybe twice a day on the underside of the leaves especially, repeat that for another day, should be it.
    i suspect your airflow wasnt enough.
    as for the virus id, its very difficult to determine....
    good luck!!!

  8. #8
    dukejenn's Avatar
    dukejenn is offline Senior Member
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    Jennevie Shih
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    Thank you very much for another help! I'm doing it now...

  9. #9
    Halloamey's Avatar
    Halloamey is offline Senior Member
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    Amey Bhide
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    Hey, i somehow missed this post, anywavs for mites I suggest the use of Axoris. As for the virus, I would strongly suspect the dendrobium and the cattleya, but it can also be primarily a mite infestation followed by a secondary fungal infection, so don't be in a hurry to discard any plants.

  10. #10
    gavstang's Avatar
    gavstang is offline Senior Member
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    Gavin Tang
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    Hey Jenn, sorry to hear abt the infestation, its always painful when it happens but I think Amey and Yew Sung have given very good advice so fingers crossed everything will be fine in time! Oh, and the tip abt watering the undersides of your phals and dendrobiums..spot on, Ive heard it from many ppl and practice it myself and so far no probs at all.

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