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Phalaenopsis leaf problem

This is a discussion on Phalaenopsis leaf problem within the New Growers: Ask the Senior Members forums, part of the New Growers category; I have a phalaenopsis that is growing near a west facing window (slightly tinted). i ...

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  1. #1
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    Default Phalaenopsis leaf problem

    I have a phalaenopsis that is growing near a west facing window (slightly tinted). i have noticed some kind of brown patches (looks cottony, puffy) starting at the tip of the lowest 2 leaves. I cut and removed the affected areas the other day but later found further brown patches of the underside of the same leaves. I sprayed with an insecticide (suppose to be a sistemic one) about twice a week for about 3 weeks and the patches have turned black and have seemed to stop 'growing'. the affected leaves are still green and upright and there are roots starting to grow at the base of the leaves. A small leave is also starting to grow from the top. My questions are :

    1) Is this some kind of infection? Don't think it is scales cos i couldn't rub it off. It was just a brown patch that got bigger and bigger. It seems that only parts that were brown turned black.

    2) Is it normal for the leaves to start dropping off once new roots appear at the base of the leaf?

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    Sounds like possibly a burn? Can you post a photo of the leaves and plant.

    Cheers,
    BD

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    hi and thanks for the reponse. i am new to this forum. can you please tell me how i can upload my photos onto this thread? thanks in advance.

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    No worries, here is a thread to help you: How to post photos 101

    Cheers,
    BD


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    got it! here goes....

    Name:  my plant.JPG
Views: 3109
Size:  36.3 KB
    my plant

    Name:  leaf top.JPG
Views: 4447
Size:  55.2 KB
    top of affected leaf

    Name:  leaf bottom.JPG
Views: 3558
Size:  45.0 KB
    leaf underside

    thanks and cheers.

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    Hi, does anyone know if the condition of the leaves is normal?

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    That's a new one on me. I'd cut the entire leaf off to prevent spreading. I hope someone can help identify it. Good luck!

    Tami

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    The silver looks like it could be damage from spider mites. Also, sometimes a plant that was attacked by mites develops a fungal infection as a result which could explain the black. If so, sorry. I hate mites!!

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    The silvery looking damage to the leaf is the typical appearance seen secondary to mite damage. There are 2 types of mites that effect orchids spider mites, and flat mites. Flat mites are native to tropical and subtropical area and are moved globally by the importation of plants. The most common species to effect Phals is the phalaenopsis mite (Tenuipalpus pacificus).

    They tend to multiply in dry conditions with low humidity levels. So winter tends to be a time one sees an outbreak.

    There are multi ways to control mites. First spraying with water decreases their population. Also filling a spray bottle with rubbing alcohol and spraying all surfaces of the plant. is effective for all stages except the eggs. Also eggs and resting adults may be in the medium. You may want to do a repot.

    I find oiling to be very effective. Horticultural oil, neem oil, mineral oil, and insecticidal soaps are readily available, inexpensive, and effective against mites but don't use on a hot sunny day.

    For full guns out, you can purchase a miticide but you need to be careful using these in an indoor growing area, they are pretty toxic.

    You may want to oil the rest of your collection for mites can spread fairly rapidly.

    The white/cottony spots may be mealie bugs. It is difficult to tell from your pics. Acohol followed by oiling also works for them.

    I would treat every 10 days over the course of a month.

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    Thank you all for your responses.

    1) The white spots in the 2nd foto is probably residue from the fertilizer i have been using. it has a high K constituent. 34 i think.

    2) black coloration under the leaf appeared only after using the insecticide. it was previously a brownish patch. am using an insecticide containing LDimenthoate. Does anybody know if this will be effective? i have removed the potting medium from the plant. can i spray the stem and the roots (formerly in the potting medium) with the insecticide before re potting?

    3) i have a fungicide containing trichloromethylthio 50% (whatever that means....???) can it be dusted directly onto the roots and stem during re-potting?

    4) is rooting powder for all types of plants? i saw some on the shelf that says it contains IBA and NAA (i think) hormones. didn't buy it cos i didn't know if it is suitable for orchids?


    am really sorry for asking some stupid questions but would really not like to see the plant go to waste under my care. it would be wonderful if i could rid the pest and let the plant flourish.

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