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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; Thank you again to all of you! the other day i sprayed fungicide then this ...

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  1. #11
    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 again to all of you! the other day i sprayed fungicide then this morning i sprayed water+alchohol mixture. And I water even each leaf of the plants now just like cleaning them up. Thanks lot learned a lot from you guys. Fingers crossed! This is quite a challenge for me.

  2. #12
    opaline's Avatar
    opaline is offline Senior Member
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    Matt
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    A sulphur bomb might be a good idea if you can get one. Se it off and shut the greenhouse off for 24 hrs. You can also buy sulphur in many fungicides and works brilliantly. The sulphur bomb will help greatly in sterilizing your greenhouse. Implement measures to increase humidity and air flow, a fan maybe. As for the mites they do show widespread resistance to many pesticides so concentrate on purchasing a miticide as mites are not insects. All of the above can be used as a precaution in the future. Forbid 4F miticide 0.5 ml per 2 liter water proved a success for me and showed no phytotoxicity ( bad reaction to chemicals) on my orchids. Continually wipe underside of leaves if possible but remember to not cross infect. Dedication and patience is your key here and you will get there. Mites have given me many nightmares but I know the early signs now so they always lose.

  3. #13
    cdayinflorida's Avatar
    cdayinflorida is offline Senior Member
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    Cathy
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    I will throw in my 2 cents. I use Avid for mites and thrips. It is a systemic and you have to be careful. I make a fungicide cocktail of a combo of Thiomil, Banrot and Dithane M45. Not all three together...but I mix Thiomil and Banrot and the next time I spray I use Diathane and Thiomil. These are systemic, as well.
    Ribavirin is used for several viruses on people including Hep C. I've read a few articles on using it horticulturally. I know it is crazy expensive.

    Looking at your photos...I think you have several issues going on.
    It is hard to trash plants. But if it is isolated in one section of the greenhouse, move that section out. If you can't bear to dispose of them...move them to a shaded area of your yard and treat them there. Treat the rest of the greenhouse aggressively.
    Clean the entire greenhouse. Bleach everything.
    Remember, I don't care where you got it, your best friend, grower, boxstore...QUARANTINE it. Make the new plants the last thing you touch, water, brush against.
    Air movement is a saving grace...during the heat of summer.
    Never water unless you know for sure the plants are going to be dry by late afternoon.

    Good luck with this...I know it can be just devastating

  4. #14
    sherene's Avatar
    sherene is offline Senior Member
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    Tan Poh Hong
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    Outside 24/7
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    vanda, paphiopedilum
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    agreed with Yew And Gavin. Sometimes ago I had the same problem for my phal and after watering the undersides, the problem gone. Good luck!

  5. #15
    Gin's Avatar
    Gin
    Gin is offline Senior Member
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    Sep 2004
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    Missouri
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    Looks like false spider mites they like Phals. the best but will attack other plants Catts. Dends. Vandas ect dry conditions encourage them . The hatch cycle is short on mites have to stay on it .

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