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May 18, 2020 9:53 AM CST
Thread OP

I would be very gratefull if someone could help me identify the reason for these problems.
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This is a croton. A few weeks ago it had some aphids and I got rid of them using an insecticide. Now I noticed these spots on the leaves. They spread quickly and then the leaves fall off. The plant is not overwatered and hasn't been fertilized soon because of the treatment.

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The same, or at least they look like it, spots were on the leaves of these avocado trees and in just a few days the fell off and now this is what is left.

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I noticed these tine black spots that are a little bit protuberant. They are on the back on the Hibiscus leaves. This plant also had aphids and was treated with the same insecticide.

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These black spots I noticed on the new leaves of the fiddle-leaf fig. It isn't overwated, has been fertilized with a special fertilizer in the dosage written on the bottle. The leaves fell off.
Also today I noticed that the Hoya I have is droopy and the leaves are soft. It is near the croton plant.
Please if you can help with at least some of these problems, write some suggestions. I really don't want the to die.
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