I had broad mites, I tried N. Cucumeris (1 or 2k , can't remember, but on one 1.25'x1.25'x2.0' plant, ordered from 'Nature's good guys') but didn't seem to see much curbing of BM symptoms and ended up with a relatively weak harvest with weak resin production and flavor. The first night I deployed I thought I saw an improvement, but I now attribute it to a feeding with aspirin mixed in coincidentally the same night.
I also added 500 ladybugs 2 week prior to harvest to help control spider mite population. The lady bugs I could at least see, and they seemed to be feeding off of something on the buds (when they were on the plant and not crawling the walls ect) and I will probably do again considering the price.
I will not be using N. Cucumeris again, they were the cheapest and were described as feeders of broadmite eggs and larvae, but I'm nut sure if it was RH, their natural ability, or what, but I did not conclude that they were effective. Also, the amount I purchased was supposed to be several times overkill for my one plant. Like I said, I could have killed the Cucumeris with my grow environment, but I've been reading more and have been finding that they are not effective in treating broadmite.
My next grow is going to be done in Coco coir/perlite/neem cake/sf nematode and I will be spraying neem once a week during veg, and then one shot of forbid 4f before harvest and then adding N. Californicus (this time) and ladybugs during flower (cpl days after forbid 4f) and finish the grow off.
N. Californicus thrives at a greater RH and temp fluctuation than N. Cucumeris and is a more aggressive predator well.
Here's a site that sells N. Californicus at the cheapest price I have been able to find.
10,000 for $22.50
https://bugsforbugs.com.au/product/californicus/
Good luck on your grow, if you have success using N. Californicus or using another method hit me up. I'm still trying to figure out a process that actually work's too..
Here's a side by side, I think I started seeing obvi symptoms by week 3/4 or the 3rd/4th pic..
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