Is this leaf septoria? If so, what should I do?

When I first started researching everything I looked into UV lighting. After finding this article in a medical journal I decided not to.

Indoor grown cannabis yield increased proportionally with light intensity, but ultraviolet radiation did not affect yield or cannabinoid content - PMC

I am going to be honest.....I didn't read the article. I skimmed it a little and jumped to the conclusion which stated UV lighting didn't add a benefit to commercial operations. I was reading something that was saying using UV lighting in greenhouses can help reduce bacteria's and fungus and this article came to mind and I decided to look at it again. I thought even though it determined UV lighting didn't increase the CBD and THC levels enough to apply to a commercial operation that maybe it would be at the personal level. When revisiting this article I realized they only looked at the CBD and THC levels in the plant tissue. The article mentioned the effects of the UV lighting on the trichomes but not in depth. The article showed 3 trichomes pics. One of the control plant with no UV lighting, a pic of a plant with UVA and the 3rd with UVA and UVB lighting. The control plant with no UV lighting had the least trichomes, the one with UVA had more and the one with UVA and UVB had the most.

I feel like the conclusion to this article may be a little flawed. Doesn't more trichomes mean more strength? And maybe it isn't flawed because one of the things they were looking for was to see if the UV lighting would trigger a secondary metabolite which it didn't.
 
If their conclusion was "we found no commercially relevant benefits of adding UV to indoor cannabis production" then that would be my takeaway without reading all of it.
 
InTheShed said:
If their conclusion was "we found no commercially relevant benefits of adding UV to indoor cannabis production" then that would be my takeaway without reading all of it.
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And that was the takeaway the first time I read it too. But looking at the trichome pics and seeing that there is definitely way more on the plants exposed to UV lighting I am wondering if it wouldn't be beneficial at a personal level.

I know we all want more trichomes but exactly what role do they play?
 
Lovie said:
but exactly what role do they play?
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That's where the THC is, but if their highly controlled and detailed analysis led them to the conclusion that there were no commercially relevant benefits, then you will need to do your own analysis on their data to decide if it would still be worth it personally.
 
InTheShed said:
That's where the THC is, but if their highly controlled and detailed analysis led them to the conclusion that there were no commercially relevant benefits, then you will need to do your own analysis on their data to decide if it would still be worth it personally.
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The article only tested the plant tissue, not the trichomes. Other than the trichome pics the trichomes are never mentioned.
 
Lovie said:
The article only tested the plant tissue, not the trichomes. Other than the trichome pics the trichomes are never mentioned.
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They measured cannabinoid content and inflorescence, which would be trichomes on flowers.

"Cannabis proliferates at very high canopy LIs (light intensities) in indoor production environments. The increasing inflorescence (and associated cannabinoid) yield responses to high LI in this trial clearly shows the benefits to maximizing canopy-level PPFD within the economical constraints imposed by other production logistics (including input costs). Conversely, we saw no commercially-relevant benefits to exposing cannabis plants to UV radiation."
 
All of the surfaced can be cleaned with bleach. Soil can be baked at 200deg for half hour. Spores constantly present in the air is a different issue harder to deal with. Indoors you can create an environment that it will not readily grow in.

UV is an antibacterial and anti fungal. They use it to sterilize surgical rooms and that is how they treat the tap water here without chlorines. The key to that and plant growth is in the dose. UV and green spectrum were considered useless to flowering plants for a long time. Now they find they are beneficial. A small amount is all that is needed for plants but a large amount is needed for disinfecting, Most all commercial lights have sufficient UV spectrum for plants now, but no where near enough to disinfect.
 
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