I have tried to kill them with Neudorff Spruzit spray (Pyrethrin) and Provanto spray (Flupyradifurone) and they still keep spreading after 2-3 months from first poisoning. I really need help because now they spread somehow in my Thai constellation monster. enter image description here

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  • it is difficult to see. Check with a lens. To me it seems much more bites (e.g. from spiders and aphids) and not scale insects. Do they move? Could you detach them? (e.g. with water or water+soap) Dec 2, 2020 at 11:01
  • Are they bumps that can be removed with a finger nail or a depression? Is there sticky sap on the floor or rim of the pot?
    – kevinskio
    Dec 2, 2020 at 16:25
  • @kevinsky Sometimes but fresh bumps are very hard to remove. And there is not any sap anywhere.
    – Ville
    Dec 2, 2020 at 18:52
  • @GiacomoCatenazzi They don't move and I cant detach them without needle or toothpick
    – Ville
    Dec 2, 2020 at 18:52
  • I wonder if it's a gall. May 27, 2022 at 6:07

2 Answers 2


It is hard to see the insects in the pictures and the damage done to the plant looks extensive.

If these are scale, spraying with an insecticide is next to useless. Insects like adult scale cover themselves with a hard shell that protects them from most insecticides. The juvenile stage, which are called 'crawlers' are the only ones exposed to a sprayed insecticide.

Unfortunately, you are going to have to remove them by hand with Q-tips or cotton facial pads dipped in rubbing alcohol. After you have removed all the ones you can see with the cotton swabs/pads then you need to spray the entire plant with a modified soap spray. The one I like to use is mix a few drops of Dawn dish liquid, about 3-4 tablespoons of rubbing alcohol with distilled water in a spray bottle. Spray the plant thoroughly, making sure to get all stems and leaves. You will need to repeat the process every 3 days until there is no longer any sign of the insects. This process will also get rid of any other type of insects, if we are mistaken about the identity of the insects

It looks like you have a very high insect infestation on your plant so you will have to be diligent to remove them. Don't forget to check all other plants you have in the same area as this one. It is likely the infestation would have spread to other plants nearby. If they are infested too, they will need the same treatment

  • Hi, In the images is fresh damages in another plant. You can see that these scales or what ever they are, are very small at the beginning. It's impossible to remove them mechanically and rubbing with alcohol won't help at all. What you think about sinking whole plant? I bought a large canister for it. ibb.co/tzF2rTK ibb.co/wct4Y7G ibb.co/NWyXJsp
    – Ville
    Dec 2, 2020 at 17:39

A systemic poison should get them . Regular sprays do not reach them under the shell . You can't use systemic on a food or spice plant. I need hours to scrape larger scales off my sweet bay bush because I don't use systemic on it.

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