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iwltfum
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Bummer. I never heard of russet mites before recently. I'm off to google them and see what the buggers look like. Best of luck with them
Edit. That was scary reading. A bit of a doomsday scenario actually, from a couple sites anyway.
From the sounds of it though you already know how best to do with them. From what I read I sounded like heat was the best way to eradicate them (?) depending on the logistics of that?
"Russet, Cyclamen or Broad mites are very sensitive to heat. They are more difficult to control in winter than in summer due to lower greenhouse temperatures.
Hot Water Treatment: Soaking infested plants in water held at 111 - 115 degrees F for 15 minutes will destroy these mites without damage to most plants. (Not recommended for Medical or Hemp growers: use Hot Air Treatment)
Hot Air Treatment: This method can only be used in contained areas (areas or rooms that can be sealed) by raising the air temperature to 115 degrees F for 15 to 20 minutes. Best results were reported using (at least) two circulation fans to create some vortex. As all eggs may not be terminated using this method, weekly repeat applications may be necessary to achieve desired results."
I read that recently when I was catching up on the topic when I realized I had them again. It sounds sketchy to me though. When I first dealt with these mites, there was basically no information on the internet about what worked and didn't work for people so I had to just figure out what killed them myself. As far as I could tell, the sulfur burner worked the best (that's what I think finally killed them off). But all that sulfur burning did sever damage to the plants and so I'm going to try spinosad/iso everyday for a week and then ever other day or so for another week. I've heard very good things about spinosad as well as alcohol and I love combining iso with mite sprays, so I'm going to combine it with spinosad and see if it does any damage. If it doesn't seem to be working after the fist week. I'm just going to burn sulfur. I know it's not a good idea to use oil sprays and sulfur right after each other like that, but I've done it before and my plants survived so, if that's what it takes, then I'm all for it. Plus my sulfur burner is not working anymore so I don't want to have to go out and buy a new one.
You can't actually see the mites with the naked eye. The mites that I found with a 60x loupe were hard to identify as anything other than just a white speck. They looked about 10x smaller than a spider mite maybe more like 20-30x smaller.
The doomsday scenarios are just hype. The mites showed up a couple of years ago in the western us (as a vagrant species - which pretty much means "someone" put them here). The reason everyone freaked out about them so much is because there were no published results on the internet about controlling them. Now that a couple years have passed, the cannabis community knows alot more about them and methods for eradication (although it's still a relatively new beast).
Root aphids - now that's a doomsday scenario. Only control is toxic, synthetic pesticides. Now that I've had those fuckers, russet mites might seem like a breeze (knocking on wood). I actually suspect that the root aphids made the plants weak enough to let the russets take hold. I was very surprised that I had any bugs at all after applying some serious pesticides in my grow room in the past month. It made me think that I had TMV right off the bat, but there are definitely bugs on the leaf - now that I've looked with some magnification.