when they get to that 3rd to 4th week and beyond the tips of the leaves turn brown no matter what nutrient strength i tested them at, the leaves from the tips moving inwards will get very thin like paper and turn necrotic. they are very sensitive to intense light and heat although these problems will also arise at temps 78 degrees and far from the lights as i have tested it. the leaves look like light damage but this happens at the top and bottom of the plant and there does not appear to be a pattern of moving up or downward. as time goes on they get more thin and dry each day.
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the plants are always very stretched out and are incredibly weak - they have tiny popcorn buds and the branches still collapse. the trichomes never turn amber even if i let the plant go weeks after they would normally be done. bud is not really even smokable - i just try to make oil out of what i can. they seem to go to a certain point in flowering then stop growing. by the end the roots are almost non-existent in the coco recently. any roots like pictured above are all gone when those bugs are around. they seem to eat all the tiny hairs and herring bone types branches off from what i saw when i had them in DWC. the main root was still there but it was like overcooked spaghetti with no tiny hairs or any branches.
Corvette - I feel your pain! Unfortunetly you might have more than mites to contend with. The nodules sound like root knot nematodes. Chems don't work well. Hot water dunks works well for commercial growers. But you might have good luck with predator nematodes. About 20 bucks per million. Couple apps might do it.I tried to find a camera i could borrow to get some pics of the mites them-selves but i don't know any-one who has one. here are a couple of pics of the plant i am having the most trouble with...i was going to cut it down untill i saw that the buggers are on all of them. There are 3 lifesaver indica doms, 2 wheelchair kush and the one in trouble is a jha kush (sp?). So maybe that strain is just more susceptible to this infestation??? I feed with maxsea 16-16-16 untill a couple of weeks after flipping to normal sun light times (i use several CFLs to extend light time untill July 4th) then switch to maxibloom and molasses in low dose with every watering. My soil is a mix of ocean forest and happy frog with dolomite and a couple of other things that shouldn't matter.
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The top half of this plant is doing fair but the lower half looks like it will die before the end of the day but doesn't.
If you look at the second pic you can see how the stems just below the bud sites have swollen up...ignore the 45 degree bend that was my getting too rough on trying to get that branch back into the cage. This swelling is only happening on the branches from the bottom third of the plant. The buds have completely quit growing above these swellings and the leaves seem to be confused as to what direction is up around the swellings as well. The fan leaves near the bottom are like parchment paper but do not completely dry out like when they die off so i think they are still alive if just barely. The top half of the plant is budding close to normal but slightly slower than i am use to.
Several of the plants are doing something i have never seen outside of Bonsai circles. Some of the roots are actually growing right on top of the soil and turning green. I dug a couple of small test holes near the main stems and found the roots are turning into small clusters that have nodules (like a potato does) about the size of a 22 pellet that are covered in these smaller mites. The inside of these branch swellings have some mites INSIDE of them as well.
I have been spraying azatrol once a week since i got the clones in April and bumped it up to every 2-3 days since i started seeing this several weeks ago. This week i have tried a Dr.Doom Bomb, Bayer advanced, and my bird cage spray (actually for over a week every other day on the cage spray) these were all i could find local. I ordered safer soap and floramite and hope they will be here in a few more days. I forgot that put sevin dust on the one plant and all around the Green-House as well as Melathion on the ground around the greenhouse.
Yesterday a friend sent his kid over since she works for the CU Extension office here. She said that it would be very hard to tell what these are exactly with-out doing a full genetic testing...VERY expensive. But she is also pretty sure my main problem isn't the normal spider mites. She thinks she saw as many as 5 different types of mites while searching my plants! There are many types of spider mites that arise in this area but there are twice as many other types of mites as well...I never knew about that till yesterday. She isn't allowed to work on MMJ grows by the State Education Rules so she can't do a lot to help me beyond looking and trying to do research on the sly. She will get back to me later in the week if she finds anything but said that the Floramite was the best option at this point (thus i ordered it yesterday). She asked me to keep some record on the citronella if i can since she heard of a research going on up north that she wanted to compare to. She is thinking of trying to get a couple of special traps to try and sneak them in for testing but doesn't know if she can yet...i am hoping she can.
I am less certain now that i have the same thing as you guys now since she talked with me but think what i learn on this quest might be helpful to those that are better versed than i in growing. There may be too many types out there to ever be certain.
I scrapped the clones and am cleaning the living #@!! out of everything in there.
I will post pics in a few days as I'm working on getting high