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07-31-2012, 08:40 AM
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Senior Member
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Join Date: Aug 2010
Location: St. Louis, MO
Posts: 3,806
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Silvery/whitish dust?
I've seen this for a few weeks on one of my Dendrobiums on the leaves. I've been spraying with cinnamon extract/water/soap mixture thinking it was mites, but I'm wondering if that assumption is wrong. What do you think?
Since I've been spraying, it does seem to be going away though.
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07-31-2012, 09:35 AM
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Senior Member
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Join Date: Jul 2008
Zone: 8a
Location: West Midlands, UK
Age: 49
Posts: 25,462
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It's difficult to tell from the pic, but it could just be hard water deposits.
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07-31-2012, 09:52 AM
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Join Date: May 2005
Location: Oak Island NC
Posts: 15,204
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Is it a powdery deposit, or is it more like a thin layer that has separated from the leaf surface (which is what it looks like to me)?
If it's the latter, it's definitely a mite issue.
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07-31-2012, 10:19 AM
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Join Date: Aug 2010
Location: St. Louis, MO
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It feels powdery as it seems to come off on my fingers, but it's kinda scaly looking. I'll see if I can't get some better pics tonight.
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07-31-2012, 10:53 AM
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mealybugs leftovers?
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07-31-2012, 12:19 PM
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Join Date: May 2005
Location: Oak Island NC
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The part I've circled in red looks to be more "flaky" than that in blue, and that's what led me to guess mites - especially two-spotted spider mites that spin no webs. It could be that the blue area is just not as extensively damaged.
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07-31-2012, 08:24 PM
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Join Date: Aug 2010
Location: St. Louis, MO
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Ok, does this pic help. It's the top.
It's scaly/bumpy.
Here's the underside which is why I suspected mites. It's powdery.
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08-01-2012, 09:15 PM
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Join Date: Aug 2010
Location: St. Louis, MO
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Don't know if this counts, but a 10x loupe didn't show anything other than powdery appearance....
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08-02-2012, 12:26 AM
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Join Date: Jul 2010
Location: Oceanside, Ca
Age: 75
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When you rub the leaf between your fingers and draw them across the leaf surface, does it leave a trail of bug guts or any discoloration? Or take some kleenex or tissue paper and do that. Is there any discoloration on the tissue paper?
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08-02-2012, 04:26 AM
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Member
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Join Date: Aug 2012
Posts: 84
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Powdery mildew
I know I'm a bit of a newbie, but it looks a bit like powdery mildew. If the *Rubbing the leaf* test doesn't show any discolouration, it could be that. If so, it's harmless, just ugly! Wipe it off with damp tissue!
Last edited by Miri the Wildmage; 08-05-2012 at 09:19 AM..
Reason: Way to fix not included in original message
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