threatco
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Hello folks.
Been keeping an eye on my leaves since some visual imperfections showed up last week on a couple of leaves. I would appreciate anyone sharing their experience and helping diagnose what is on my leaves, and prescribe a remedy.
Background:
100cm by 100cm, 200cm tall grow tent. Ebb and flow in Hydroton. 3x 1500w KingPlus LEDs, 24 inches above the canopy, the middle LED set to half power. 5.5-6.5 range PH. 30ppm tap water, nutrient range from 300-750 between full refills. Remo Nutrients. 6-inch 340 CFM inline fan creating positive pressure in the tent from the bottom. Flaps near top open to let air-flow up through leaves. No carbon filter. Temp range 65-81. rH range 31-49%. Growing NL#5 x Haze and Ice Cool. Never foliar spray or get leaves wet.
Last week I added the third light, at first at 18 inches. So I was watching closely for heat stress/ bleaching / burnt tips. I ended up not finding what I expected.
Situation:
For the past week, there have been a very small number of leaves that have caught my eye as having imperfections. I was assuming it was related to the extra light so I reduced ppm, raised lights while reducing intensity 16%, and kept an eye on it.
The above plan did stop the minor tip burn I started seeing in some places. But these other spots kept drawing my eye. So today I cut off 4 leaves for a look with a digital cam on zoom, and some 60x/120x microscope pics.
I labeled the leaves A, B, C, and D.
A and B are the ones I am concerned about. They show little black rings on the underside and a faint orange rusty color on the top side.
I would say there are maybe only 2-5 leaves in the whole tent that have similar signs but not as bad.
D is my control. I cut it from near the same part of the canopy. This is what 99% of my leaves look like. To my eyes, just about perfect. This is posted for comparison purposes.
C is another story. You may have seen in the LED lights forum my Kingplus rebuild. In that, I drilled some holes in a license plate to rig up a new light.
Not being a handy kind of guy, I did not anticipate how many tiny little bits of metal drill debris can remain even after wiping it down. So after mounting the light, I found a couple of leaves with a handful of tiny tiny dust size little metal bits on them. I think these cause some kind of light burn where they were heating up by the direct LED light. I have added the pics of C leaf for curiosity's sake.
So what do you think?
C pics in reply.
Been keeping an eye on my leaves since some visual imperfections showed up last week on a couple of leaves. I would appreciate anyone sharing their experience and helping diagnose what is on my leaves, and prescribe a remedy.
Background:
100cm by 100cm, 200cm tall grow tent. Ebb and flow in Hydroton. 3x 1500w KingPlus LEDs, 24 inches above the canopy, the middle LED set to half power. 5.5-6.5 range PH. 30ppm tap water, nutrient range from 300-750 between full refills. Remo Nutrients. 6-inch 340 CFM inline fan creating positive pressure in the tent from the bottom. Flaps near top open to let air-flow up through leaves. No carbon filter. Temp range 65-81. rH range 31-49%. Growing NL#5 x Haze and Ice Cool. Never foliar spray or get leaves wet.
Last week I added the third light, at first at 18 inches. So I was watching closely for heat stress/ bleaching / burnt tips. I ended up not finding what I expected.
Situation:
For the past week, there have been a very small number of leaves that have caught my eye as having imperfections. I was assuming it was related to the extra light so I reduced ppm, raised lights while reducing intensity 16%, and kept an eye on it.
The above plan did stop the minor tip burn I started seeing in some places. But these other spots kept drawing my eye. So today I cut off 4 leaves for a look with a digital cam on zoom, and some 60x/120x microscope pics.
I labeled the leaves A, B, C, and D.
A and B are the ones I am concerned about. They show little black rings on the underside and a faint orange rusty color on the top side.
I would say there are maybe only 2-5 leaves in the whole tent that have similar signs but not as bad.
D is my control. I cut it from near the same part of the canopy. This is what 99% of my leaves look like. To my eyes, just about perfect. This is posted for comparison purposes.
C is another story. You may have seen in the LED lights forum my Kingplus rebuild. In that, I drilled some holes in a license plate to rig up a new light.
Not being a handy kind of guy, I did not anticipate how many tiny little bits of metal drill debris can remain even after wiping it down. So after mounting the light, I found a couple of leaves with a handful of tiny tiny dust size little metal bits on them. I think these cause some kind of light burn where they were heating up by the direct LED light. I have added the pics of C leaf for curiosity's sake.
So what do you think?
C pics in reply.
Last edited:
