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  #1  
Old 09-11-2018, 09:02 AM
jwhitley527 jwhitley527 is offline
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Hi everyone,
It has been a long time since I have posted my rescues are all doing great I repotted most in Semi Hydro. This particular orchid Den. Royal wings is brand new to my collection. I purchased her three months ago and two weeks ago I noticed this white what looks like powdery mildew on the leaves. Does anyone have an idea of what it may be. I have cleaned the leaves with alcohol dish soap water mix, lemon juice, and straight peroxide. I have a grow space set like a greenhouse has two fans in it humidity is 60 temp it 80. here are some pictures.

Thanks everyone

Julie
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  #2  
Old 09-11-2018, 10:58 PM
estación seca's Avatar
estación seca estación seca is offline
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That looks like spider mite damage. Spider mites love thin-leafed plants of all kinds, and are common in warm and low-humidity environments. Some thin-leafed plants are such delicacies they even attack in higher humidity. Spider mites are famous for attacking thin-leafed Dendrobiums like this one.

Take a tissue and rub from the stem to the leaf tip on the underside of the leaves. If you see brownish or red streaks you have spider mites. You need to move fast. They can kill plants in a few days. They will be on all your plants, but damage won't be visible on the more resistant ones.

Spray the entire surface of all your plants with one of two things: 70% isopropyl alcohol (rubbing alcohol), or 1 Tablespoon of liquid dish soap for hand washing dishes in a quart of water (15ml soap in 1 liter water.) Then read more about spider mites here on Orchid Board in the Pests and Diseases forum.
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  #3  
Old 09-12-2018, 05:53 AM
jwhitley527 jwhitley527 is offline
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Quote:
Originally Posted by estación seca View Post
That looks like spider mite damage. Spider mites love thin-leafed plants of all kinds, and are common in warm and low-humidity environments. Some thin-leafed plants are such delicacies they even attack in higher humidity. Spider mites are famous for attacking thin-leafed Dendrobiums like this one.

Take a tissue and rub from the stem to the leaf tip on the underside of the leaves. If you see brownish or red streaks you have spider mites. You need to move fast. They can kill plants in a few days. They will be on all your plants, but damage won't be visible on the more resistant ones.

Spray the entire surface of all your plants with one of two things: 70% isopropyl alcohol (rubbing alcohol), or 1 Tablespoon of liquid dish soap for hand washing dishes in a quart of water (15ml soap in 1 liter water.) Then read more about spider mites here on Orchid Board in the Pests and Diseases forum.
Thank you,
I did that last week but I did see what you said . I just did not know if the white was fungus because it did not come off. So my leaves will stay like that? The texture is different to so sad I cleaned all my orchids again yesterday.
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