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White patches on leaves

This is a discussion on White patches on leaves within the Orchid Ailments / The Compost Pile forums, part of the Orchid Culture category; Thanks, Carol, this is the only one in my collection of orchids which has been ...

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  1. #11
    eeyore is offline Senior Member
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    Thanks, Carol, this is the only one in my collection of orchids which has been susceptible to the spider mites...

  2. #12
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    Looks like a typical spider mite infestation. The silvery, white coating is because the mites have sucked the chlorophyll out of the leave. The cause very often is low humidity. I use Bayer 3 in 1 with great results, not sure you have this in Hong Kong. Most miticides require 3 applications, 7-10 days apart.
    Good luck.

  3. #13
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    citywildcat is offline Senior Member
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    Quote Originally Posted by Puppies2 View Post
    Looks like a typical spider mite infestation. The silvery, white coating is because the mites have sucked the chlorophyll out of the leave. The cause very often is low humidity. I use Bayer 3 in 1 with great results, not sure you have this in Hong Kong. Most miticides require 3 applications, 7-10 days apart.
    Good luck.
    I used the Bayers for something else (can't remember)/not orchids, but in any case, it's good stuff! I would definitely give it a try.

  4. #14
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    T4tlrman is offline My name is Terry and I'm an addict ~
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    Quote Originally Posted by catttan View Post
    Since the 'patches' occur on the surface of the leaves I don't think that they are spider mites as these tend to occur on the under sides of leaves. Most probably water spots/ chemical or fertilizer residue.
    I concur cattan, or could it be scale of some sort, like roses get?

  5. #15
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    t4tlrman, that's what I originally said too......I was the first one to step out with that unpopular opinion, LOL. Perhaps I'm wrong because I tend to be a positive thinker..... I'd rather have water spots then spider mites! I always go with the least deadly diagnosis

  6. #16
    eeyore is offline Senior Member
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    I think it was probably spider mite but perhaps it was earlier in the year when the weather was drier. We are now in the midst of a very humid summer and as I understand spider mites don't like the damp? The undersides of the leaves are very silvery, more so than the top, so Carol is probably right that the damage started on the undersides and spread to the top. I have now also managed to get some neem oil so I'm trying that out... As I've got herbs growing in the same area, I'm sticking with food-safe products. I'm hoping anyway that the infestation is actually already gone but I will spray them preventatively anyway. I'll let you all know when new leaves appear as to whether they are then clear of the spotting...

    Once again, thank you to everyone who has helped to analyse this for me. This community is SO helpful! You guys are great!

  7. #17
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    citywildcat is offline Senior Member
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    Quote Originally Posted by eeyore View Post
    I think it was probably spider mite but perhaps it was earlier in the year when the weather was drier. We are now in the midst of a very humid summer and as I understand spider mites don't like the damp? The undersides of the leaves are very silvery, more so than the top, so Carol is probably right that the damage started on the undersides and spread to the top. I have now also managed to get some neem oil so I'm trying that out... As I've got herbs growing in the same area, I'm sticking with food-safe products. I'm hoping anyway that the infestation is actually already gone but I will spray them preventatively anyway. I'll let you all know when new leaves appear as to whether they are then clear of the spotting...

    Once again, thank you to everyone who has helped to analyse this for me. This community is SO helpful! You guys are great!
    eeyore, many people kind of pooh-pooh this idea but I try it first before reaching for something more toxic like neem oil or other pesticides - insecticidal soap. A lot of people think it's pretty lame when dealing with a major infestation but I don't know what you have - everything that comes in the door gets hit with insecticidal soap before going into my greenhouse. I HEARD neem oil has some properties that are toxic to cats, or maybe even pets in general. Whether this is true, I don't know. Better to be safe than sorry which is why I start with insecticidal soap and move down the list...GOOD LUCK!

  8. #18
    eeyore is offline Senior Member
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    Quote Originally Posted by citywildcat View Post
    eeyore, many people kind of pooh-pooh this idea but I try it first before reaching for something more toxic like neem oil or other pesticides - insecticidal soap. A lot of people think it's pretty lame when dealing with a major infestation but I don't know what you have - everything that comes in the door gets hit with insecticidal soap before going into my greenhouse. I HEARD neem oil has some properties that are toxic to cats, or maybe even pets in general. Whether this is true, I don't know. Better to be safe than sorry which is why I start with insecticidal soap and move down the list...GOOD LUCK!
    Thanks for the warning, citywildcat. Sadly I have not been able to find insecticidal soap here, even finding neem oil was tricky. However, thankfully I don't have cats and from the reading I have done (e.g. Neem Oil General Fact Sheet and http://www.epa.gov/opp00001/chem_sea..._07-Apr-10.pdf, it seems that neem oil is found in a lot of products we use already and if used in the right ways and concentrations, then it is safe.

  9. #19
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    Neem oil is quite safe for pets too. I dont have pets myself but know quite a few of my friends who have pets and for that reason use only neem oil.

  10. #20
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    This may sound different but you could try to use a thin layer of vegetable oil over the top and bottom of the leaves. The down side is that it will leave leaves feeling waxy and fake. Upside is that it can be a substitute for leaf shine and insects don't seem to like the change in taste. Just make sure it is vegetable though this is the only oil that works on plants ironically.

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