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You have a pest investation. Can try neem seed oil or nematodes, however nematodes will only kill larva in the soil. For thirps need a 2 step combat with nematodes in soil and neemseed for vegatation.
Looks like a peat problem, what kind? Don't know. Identify the pest, by close observation. Try some organic pesticides, I have a lot of success with Growsafe gs420.