I have successfully taken and fully established five clones (10 weeks old) from my Durban Poison plant. I now want to switch them to bloom. However, I have recently noticed that some of the leaves on all the clones have specks on them - see photo1. I have checked for spider mites under magnification but can see no signs of bugs on either side of the affected leaves. Also, some of the unaffected/less affected leaves are curling and twisting - see photo 2. I have been very sparing on nutrients and water only when soil is dry.
I would check for pests. It looks similar to thrip damage.
I have thoroughly checked both sides of many leaves with a 60 X microscope and can’t see any pests. Could pests cause the tips of the leaves to curl?
Do you have a fan blowing directly on the plants. I have seen wind burn look similar. Fill this out and we can help
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Pics of the whole plant will help too.