:Gary: Kudo, my friend, sucky to hear about this challenging vermin! Jm has a good article on them:
https://www.autoflower.org/content/136-what-thrips.html
... I battled them too last season outside, and had great results with spray product with
Spinosad in it, and some diatomaceous earth on the soil surface,... Spinosad is a substance made by a special type bacteria, and it acts like a neurotoxin to a certain kinds of bugs (pretty broad spectrum),... it's rated safe for organic gardening, as it doesn't have harmful effects on most other creatures and never on plants... I don't know what's available in your part of the world, but there should be some product at a garden centre or nursery.... I would add extra wetting agent to it as well,.... I saw no negative impact on the plants, and the thrips were sickened soon after spraying, dead the next day,...I see very little residue from it on leaves, most likely from the wetting agent, so I think it's okay for budding plants (I used it at that time, keeping most of it away from the buds themselves)...
Another excellent product is
Axamax (General Hydroponics), a neem derived spray, that is okay to apply right up to harvest, so they say,... seen lots of good results here with it....OMRI listed...
Pyrethrum sprays are also a fine choice, also organic certf., food safe, etc.,... made from chrysanthemums!
The article will tell you about their life cycle, but in short eggs are not laid in soil, instead they get place on or in the plant tissues; larvae hatch, feed,
then drop into the soil to pupate, emerge as adults and climb back up to feed again,... so, this is where the DE comes into play... at the microscopic level, DE is made up of the shell-like frames aquatic algae build around their bodies; these are made of CaCO3, or more often SiO2 (glass); to the bugs, it's like nasty sharp glass shards they have to crawl over, which punctures their bodies and they bleed out! plus, it has some nute' value from the Si....
So, brv,.. :firedevil:

:thumbs: kill kill kill!!! -oh yh.... :smoke: