Help for piercing caterpillars 4th flowering week

You could try and use parasitic wasps, they will lay their eggs inside the caterpillars and kill them.

Also spraying Diatomaceous Earth isn't a good idea. What you put in the spray might be safe, but the water is not! With holes/wounds on your plant, spraying anything will raise the chance of running into more rot issues than just with the caterpillars.

Bacillus thuringiensis kurstaki. It's a bacteria that will kill the caterpillars that try to eat your plant, but it needs to be given to the plant in veg to uptake before flower. It mainly targets caterpillars, so it won't kill any beneficial bugs you might have around. BT is a bacterium, so it is not spores. You need to add it as a preventative before the worms come, not as a reaction once you see them. Once they are in your plant and eating it is too late. You are now learning a lesson on how to go about your next season, BT is not going to save you now. You also don't want to spray anything on your plant now unless you want to throw the whole thing away in a few weeks. You can apply BT as a soil drench and the bacteria will form a relationship with your plants to stop the caterpillars on the 1st bite when they do come round later. Sorry for the bad news, but all you can do now is scout and cut your losses.

I think you have more pest issues than you realize. I’d get a Microscope and check out your entire garden because I’m pretty sure you are going to find some spider mites as well amongst the pests you’ve already located. I use neem oil and diameters earth. Neem oil is out of the question but you can use a small amount of diametreous earth while in flower. At this point if you don’t really have many good options available. I use fox farm soil conditioner which has a lot of fungus gnats so I always top dress a tiny amount of diameters earth during my week 3-4 top dressing even if I don’t see any evidence of existing pests. Good luck and I hope this helps my friend.

BT be is BTi or BTk works when the caterpillars ingest it. So it will need to be sprayed on the plant and they will have to consume it. The spores then germinate inside them and make a toxin that kills the caterpillars.