I thought you "organic" nutrient people put sh!t in the soil, not all over the plants
.
But, seriously, condolences and commiserations re: your thrip issue. One of the downsides to running a perpetual and always having multiple plants at multiple stages in the life cycle is that you probably don't feel like ending every plant in the apartment and fumigating the place. Ever.
Probably convenient that your bathroom is no longer an active plant-growing zone. A shower is a valuable pest-fighting tool (especially if the showerhead is on a flexible hose and there are three+ hands available).
Pyrethrum seems pretty capable, where thrips are concerned. There are foggers available that would allow you to do your entire apartment. Will also take down many things that you might not even know about (if you even have such critters). But I don't remember whether or not it has any residual power.
A big part of the thrip problem is that the pupal stage (in the soil) doesn't eat, so poisons that depend on consumption won't touch them at this stage.
I've got about 40 pounds of diazinon granules. IDK if it's still good; has been in the shed for years and may have gotten wet a time or two. Then again, it's listed as a nonsystemic insecticide, so it might not be effective on the little b@stards (I think that means that plants won't take it up from the surrounding soil to later be consumed by the insects - and... people?). But it might also mean that it wasn't dissolved if it got wet. I guess they took it off the market years ago because it worked as good on birds as on bugs, lol. I hate pigeons and don't care for other birds unless I'm
really hungry, but I've heard it also kills bees
. And probably bats, too, and they're pretty important animals. So I still have the stuff, having refrained from using it.
Malathion probably works, at least on the adults. Is that one still available? I remember being told not to use it in small, confined spaces. Maybe the lady at the old hardware store thought I was growing something in small, confined spaces, lol?
Here's an article I found in my web browser's bookmarks when I typed "thrips" into the search gizmo:
Managing Western Flower Thrips on Greenhouse Crops - CT Integrated Pest Management Program
Oh, that's a long one. Maybe I should include a code-box copy of its address in case the forum software breaks it up for multiple lines and word-wrap?
Code:
https://ipm.uconn.edu/documents/raw2/Managing%20Western%20Flower%20Thrips%20on%20Greenhouse%20Crops/Managing%20Western%20Flower%20Thrips%20on%20Greenhouse%20Crops.php?aid=204
I don't remember reading it, to be honest. I just glanced at it, though, and there is a bit on biological control. I liked seeing "...may also feed on mites, in the absence of thrips." Sounds like a winner, that does
. How do you know all your thrips are dead? Your mites start to die off, hee hee hee.
Put either blue or yellow index card, coat with vaseline,
Yeah, I read once that they like blue better. Must have something to do with the flowers on (or leaf coloration of) the plant(s) they evolved to consume as the main portion of their diet. Kind of unusual for suchlike, isn't it? Most bugs seem to gravitate toward the yellow colors.
EDIT: I also just read of a study done trying to figure out a way to kill the things from grape vines without chemicals. Turns out that submerging a plant into 125°F water for five minutes kills all life-stages of them...
"Phylloxera in Oregon Grape Vines: Biology and Treatment ofPlanting Stock With Hot Water Dips Bernadine Strik and Paula Stonerod Associate Professor and Research Aide, Dept. of Horticulture Oregon State University"