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01-03-2021, 07:49 PM
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Member
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Join Date: Apr 2019
Location: Georgia
Posts: 79
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Grammatiphylum issues
I have 2 grammatophylums.... The big one (first 2 pics) has sticky substance on the underside of the sleeves, and reddish brown spots. The smaller one (second 2 pics) has a lot of spots on its leaves. I’ve had a problem with spider mites in the past, but they both been treated. Help would be greatly appreciated
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01-03-2021, 08:58 PM
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Super Moderator
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Join Date: Jun 2008
Zone: 10a
Location: Coastal southern California, USA
Posts: 13,735
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How recently were they treated for spider mites? And how many times? Generally, when using a pesticide one is not done... you need to apply it every 5 -7 days, at least 3 times to be sure that you have killed multiple generations.
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01-03-2021, 09:20 PM
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Member
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Join Date: Apr 2019
Location: Georgia
Posts: 79
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I failed, I only treated it once. I will start over, are the spider mites related to the sticky substance?
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01-03-2021, 09:26 PM
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Super Moderator
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Join Date: Jun 2008
Zone: 10a
Location: Coastal southern California, USA
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Very likely.... they nibble on the cells on the underside of the leaves, causing them to "leak" and eventually die. Yeah, hit those bad boys again. Most pesticides don't kill eggs, so that's why the repeat applications are needed. You kill the adults, but then the eggs hatch and grow up to be new adults... you want to nail the successive generations so that they don't keep reproducing. And make sure that what you're treating with is a miticide... mites are arachnids not insects, so insecticides don't kill them, at least not efficiently. If you are using something mild, like Neem, there is no residual effect so even more important to be persistent.
Last edited by Roberta; 01-03-2021 at 09:29 PM..
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01-03-2021, 09:59 PM
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Member
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Join Date: Apr 2019
Location: Georgia
Posts: 79
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Thank you so much!! I have Ortho insect, mite and disease spray, so I will hit them up weekly for the next several weeks. Really hoping to get rid of this problem for good!!
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01-03-2021, 10:02 PM
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Super Moderator
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Join Date: Jun 2008
Zone: 10a
Location: Coastal southern California, USA
Posts: 13,735
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Well, not for good... for the time being. They're teensy, and in the environment. You'll get the ones that you have right now, but you'll still need to stay vigilant, the world is full of them and they are small enough to find their way into the house.
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01-03-2021, 10:18 PM
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Member
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Join Date: Apr 2019
Location: Georgia
Posts: 79
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Sigh, ok, I’m sure you’re right, it’s just disheartening to me. Thank you again
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01-03-2021, 10:48 PM
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Super Moderator
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Join Date: Jun 2008
Zone: 10a
Location: Coastal southern California, USA
Posts: 13,735
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The invertebrates were on the planet long before we were, and likely will be there when we're extinct. We can mitigate, but permanent victory not going to happen.   |
01-04-2021, 04:55 AM
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Senior Member
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Join Date: Jun 2015
Zone: 9b
Location: Phoenix AZ - Lower Sonoran Desert
Posts: 18,567
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Some thin-leaved orchids are more susceptible to spider mites. Grammatophyllums are in this category. You need to look at them frequently for mites.
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