Storkanswered grow question a year ago Take a dark piece of paper into the garden and knock the onion tops against it; if thrips are present, you will spot their tan-colored bodies on the paper. A couple of treatments with insecticidal soap kill them
Shaking branches to remove the thrips and catching them on a cloth underneath is one easy way to quickly remove the thrips from your plants
try using yellow or blue sticky traps. 🍻🍻🍻