Please help, my dracaena marginata is and has been getting black spots


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My indoor plant which I adore is getting black spots on the leaves. You can scrape them off. I feel that it most likely has to do with a bug, but I couldn't find anything online. I gently scraped off most of the black spots but left some in hoping for some help/answers. If anyone knows how to help this, I'd greatly appreciate it!
 

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My indoor plant which I adore is getting black spots on the leaves. You can scrape them off. I feel that it most likely has to do with a bug, but I couldn't find anything online. I gently scraped off most of the black spots but left some in hoping for some help/answers. If anyone knows how to help this, I'd greatly appreciate it!
If these "spots" are difficult to scrape off what you have are hard scale insects. To get rid of them spray with Neem Oil. If the "spots" are easy to remove spray with a spinosad based insecticide as the insects are likely some type of beetle. Or you can take a much better close up picture and we can tell you for sure what it is.
 
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If these "spots" are difficult to scrape off what you have are hard scale insects. To get rid of them spray with Neem Oil. If the "spots" are easy to remove spray with a spinosad based insecticide as the insects are likely some type of beetle. Or you can take a much better close up picture and we can tell you for sure what it is.
Thank you so much for that awesome information, truly grateful.
I attached a couple more pictures in hopes you might be able to tell which one exactly. (Last one is the close shot)
Thank you so much!
 

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Thank you so much for that awesome information, truly grateful.
I attached a couple more pictures in hopes you might be able to tell which one exactly. (Last one is the close shot)
Thank you so much!
Those are hard scale insects. They permanently attach themselves to the plant and do not move. When you kill them they do not fall off of the plant immediately. Neem Oil is the best remedy and it smothers them and their eggs. Spray all of the plants in your house just to be on the safe side.
 
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Those are hard scale insects. They permanently attach themselves to the plant and do not move. When you kill them they do not fall off of the plant immediately. Neem Oil is the best remedy and it smothers them and their eggs. Spray all of the plants in your house just to be on the safe side.
Thank you very much Chuck, I'll go buy neem oil today. I moved it outside because I was worried about my other ones but I still will to be safe like you said. Thank you so very much!!
 
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One last question. Should I get natural 100% neem oil and spray it on, or should I mix it with water or anything to dilute it?
 
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One last question. Should I get natural 100% neem oil and spray it on, or should I mix it with water or anything to dilute it?
All of the Neem Oil I have seen and I have used different brand names are all 70% Neem Oil concentrate. The rate of usage states 1 oz per gallon of water but I always use 2 oz for scale. Do not apply in the heat of the day if you spray outside.
 
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Thanks again Chuck! I was just looking for a cheaper alternative on amazon which seems to be pure neem oil.
May I ask if you have any products you recommend? Then I'll happily just get that product :)
 
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Thanks again Chuck! I was just looking for a cheaper alternative on amazon which seems to be pure neem oil.
May I ask if you have any products you recommend? Then I'll happily just get that product :)
I think that all neem oil is basically the same. The neem here in Texas is marketed by Monterrey and sold as Neem Oil Concentrate. The active ingredient is 70% neem oil. It may seem expensive but it makes a recommended 16 gallons. That's a lot of spray.
 

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