it also seems to me that you gave foliar spray too early with diatom earth, the plants in the first weeks are little resistant to any type of insecticide even natural like neem oil. I think you should let the plants gain more structure before applying diatom earth. at first you should just give them a bath with some pest prevention product like the bio bizz leaf coat or canna cannacure. these burns on the leaves can be the effect of diatom earth. good luck mate 🙏👍😎
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