Unknown Problems with Jack Herer

[knowledgehunter]

I am growing the Jack Herer strain. I am having wierd problem during late flowering about 2 months in. The plants are showing signs of stress including pollen sacs in various areas. Although, the plants never make viable seeds. I have been very careful this grow to make sure the runoff is correct. I make sure night time humidity is < 60% by using exhaust fans and a night time only heater. I use neem oil + pyrethrin + pepper oil + organic soap for insecticide and fungicide purposes. I am using coco. pH at runoff is 6.4-6.7. Nutes at runoff are 850ppm. I flush every week with cal/350ppm nutes. I add nutes at 1470ppm every other watering with cal/mag water in between.

One Jack Herer plant over a 3 day period showed significant changes. I thought the problem was either nutes, bugs, or fungus. I photographed representative leaves from trim of the bud showing the most symptoms. Most of the pictures are of the problem areas and unknown items on the plant.

On inspection with a dissecting microscope. I did not find anything moving on the plants. I found clear to opaque bumps. I do have many knats (black clear winged). Please look at the bumps with the hairs sticking out from them. The brown necrosis happen in 3 days. What are the white bumps. Please give some advice.

Thank you for taking the time to respond.
-Knowledgehunter

 

[izzywozzywizzy]

If they were mine id lower ph in to 5.8 and hopefully run off would end up 6.0/6.2 .just my eyes but i would double check under leaves for spidermites ,i use ec 15 no higher in coco , i always had ph 5.8 in coco ,youve probaly done all this ,i used canna coco for years no probs with cal/mag ever ,so i wouldnt know if thats your prob,good luck.

 

[RetroGrow]

You have broad mites, going by the opaque bumps you see. Those are eggs.
You can usually see them on the underside of the leaves, but they require 100X scope to see. The mites are harder to see than the eggs. Google "broad mite eggs", or "cyclamen mite eggs", and you will see pictures of them. See if they match what you are seeing. The better the microscope, the easier to see. The mites hide and are translucent, so difficult to see.
If that's what it is, you are too late in flower to use chemicals, but can use the heat treatment, which is explained in the broad mite thread, starting around page 40.Since Jack Herer is a 14 week strain, you may still be able to rescue them.
Also, PH in coco should be 5.8.

 

[knowledgehunter]

Izzy and RetroGrow,
Thank you for the reply. I looked up broad mites and I am not seeing the same thing on the one plant. I have Black Widow in the same grow area that is not having any of the same effects. The BW plants do not show necrosis nor the bumps. Can BWs just have higher tolerance to the broad mites? I am tired of the Jack Here problems. These problems only happen late flower. I will lower my pH though.

I was hoping the bumps were developing tichcomes.

Seriously, thanks for the reply.

 

[knowledgehunter]

retro,
Will preforming the heat treatment (dunking the entire plant in 112F water for 10mins) dissolve the trichomes on the plants?

 

[Granger2]

Have you tried flicking or scratching the specks off? Or are they part of the leaf? The warm water dunk shouldn't dissolve the trichomes, but it you aren't gentle, they can get knocked off. Good luck. -granger