Shcrews,
Have you seen an actual mite yet? Overwatering can cause yellowing on lower leaves and so can a phosphorus deficiency. It would be good to see a picture of what you're describing if there is any plant material left showing it.
i'll get a picture soon. it's definitely russet mites or something similar, the damage looks exactly like most of the images on google... dead brown growth tips and tacoed leaves... I looked at a branch with mite damage under a 100x microscope and saw several of the tiny fuckers crawling around on the stem. been spraying everyday with wettable sulfur and essential oils, seems to have stopped the problem from spreading. The damaged plants seem to be improving too. I think/hope we caught the problem early enough to avoid any significant losses. going to keep spraying daily until the predator mites arrive in the mail.
i like Mean Gene's explanation better. i dont think the plants have a fungal infection because they seem to be growing just fine , no problems since i pulled off the wilting lower branches.Regarding the potential fungal issues I would say hemp canker first. I used to deal with it at an old property and the guaranteed way to not have it infect your plants is to crop rotate, treat the old soil with contans (I don't know if you can get it in OR anymore, maybe Cali still), plant some cover that isn't a target crop for the fungus (Sclerotinia sclerotiorum) like something in the grass family. You've been growing here for years now and once hemp canker is there, it's there indefinitely as long as you keep growing cannabis in the same soil. My old property had zero loss to it the first year, 5% plants infected the next, 20% third year, 45% the fourth year...
hemp canker scares me , i hope we dont have it. will any labs accept tissue samples to confirm its presence?
...
HThere was a small thread on insta last year and meangenefrommendocino said the following which makes sense to me- "i get this most commonly when the stem sort of kinks the cambium layer on the bottom side where the bulk of nutrients are carried. most common on the lowest six branches, and so i remove those at the baby stage, then i tie the branches near the base up to the plant to make sure they maintain the correct angle. Some strains are more resistant to the problem than others"