If they keep returning, it’s likely that some eggs or larvae are surviving treatments, there are hidden thrips in soil or crevices, or your approach needs a more aggressive, multi-step routine to fully eradicate them.
To break the cycle, you’ll need a consistent, layered attack: quarantine affected plants, trim off and immediately dispose of infested leaves.
Wipe all leaves with insecticidal soap or a diluted neem oil solution every three to four days for at least a month.
Place yellow sticky traps near plants to catch flying adults before they lay eggs.
Or introduce lacewing larvae or predatory mites (Amblyseius cucumeris), which target thrips at multiple life stages.
