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Rhyzoctonia or Erwinia

This is a discussion on Rhyzoctonia or Erwinia within the General Orchid Culture forums, part of the Orchid Culture category; Hello eveyone! I think I'm getting desperate... The more I'm trying to figure this out, ...

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  1. #1
    MissValanor's Avatar
    MissValanor is offline Junior Member
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    Question Rhyzoctonia or Erwinia

    Hello eveyone! I think I'm getting desperate... The more I'm trying to figure this out, the more confused I get... Therefore I am hoping someone would help me... Is this Rhyzoctonia rot or Erwinia Brown rot on Phrags? If it was Erwinia cypripedii, it would quickly destroy whole plant nope? This doesn't spead so rapidly, it usually kills one leaf, and does not kill whole plant... I'm using cinnamon which dries the brown patches so they do not spread... Well... if anyone could help me, I'd be very thankful!!!!

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  2. #2
    ksriramkumar is offline Senior Member
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    Sorry about that. Does the infection start from the leaf tip and progress towards crown or how is it?. Does the description match with yours?. "This fungal disease infects the aerial portion of the plant. The leaves are most often attacked. Leaf tips turn brown beginning at the apex and proceeding toward the base. Dark brown or light gray patches develop, sometimes as concentric rings or as numerous dark bands across the leaf. The affected area is usually sharply defined and somewhat sunken, while the remainder of the leaf appears normal. Sporing bodies develop in the infected area."

    if yes this is Anthracnose. you would need remove the infected leaves with a sterile instrument and then treat the plant with thiophanate methyl or mancozeb

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    That doesn't sound 100% exactly, since it seems to appear randomly, anywhere from the crown, middle and top of leaves.. therefore I guess it's splashed water which transmits the rot... if it's in the crown as on the second photo, it might eventually kill the whole rosette, but it won't transmit onto new growths.. As mentioned, I treat it with ground cinnamon, which dries the brown patches which won't expand more... But of course I am also removing all the affected leaves as well...

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    I suspect it is a pseudomonas bacterial infection.

    Rhizoctonia is a root rot and erwinia proceeds by liquifying the internals of the plant and moves really fast.

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    That sounds about right... Will try to figure out more then... Thank you

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