1st real problem, 3rd wk into flower

Panhead59 · Jun 30, 2021

1st real problem, 3 wks into flower. Ffhf soil. 2-300w leds. Brown spots on about 4-6 leaves on ac/dc. I think auto, 'cuzz it flowered on it's own. Supposed to have been photo but that's water under the bridge at this point. All affected leaves at same height. I suspect light burn. Whadaya think ? 12-16" from light. What's throwing me off is obviously a severe lack of experience !!!!!! A total lack of communication !!!! The bud above the burned/affected leaves doesn't show any issues. Shouldn't that top area be showing light stress if indeed it is the light? I tied it back, again, just to see if my hunch is correct. Other ac/dc and white widow look fine except for very slightly brown tips on white widow. Pretty sure that's me pushing just a tad too hard on the nutes. It's definitely not overwatered.

karolanne · Jun 30, 2021

They will all tell you: add pictures...

Panhead59 · Jun 30, 2021

000ps sorry. Maybe I'm the one stressed !!!!!

Panhead59 · Jun 30, 2021

Now i notice the spots are on the outter half of leaves. Gotta go to bed, it's been a long night.

Panhead59 · Jun 30, 2021

Last time feed was Friday,am. Ff trio + cal-mag. Water only monday pm. Notation on calendar says "pretty dry and light, just about right timing". (Today is Wed.)

Ponky · Jun 30, 2021

Looks like an example of calcium deficiency. Stretching possibly from heat stress. Over all not looking terrible. Is it a pure sativa?

Panhead59 · Jun 30, 2021

Ac/dc. Write up from seed co. Says 50/50. Also says to go easy on nutes. Susceptible to nute burn.

Panhead59 · Jun 30, 2021

Anybody else recognize these brown spots? Looks like rust.

Panhead59 · Jul 1, 2021

I should add that i recently got a dehumidifier for tent. Rh was high, now 40-50 %. Was 60-70.

tobh · Jul 1, 2021

the distribution of the spots look like pest issues to me. scope the leafs. the collapsing of the cells like that in nonuniform fashion isn't indicative of a nutrient issue ime, especially with how healthy they look otherwise. could be a consequence of the transition to lower rh as well. but definitely scope the underside of those leafs.

Panhead59 · Jul 1, 2021

Ok tks

chemistry · Jul 1, 2021

Panhead59 said:
000ps sorry. Maybe I'm the one stressed !!!!!

4th pic down looks like the start of a mite attack, other than that you plants are fine, just watch you Nitrogen.

Frankster · Jul 1, 2021

I have to lean toward pest too, at first I thought cal, TBH.

I think the op would be well advised to give us some better more "in focus" leaf shots, if possible of the actual damage.
The stippling is apparent, but it's not as obvious or advanced as I would normally anticipate.

Check the undersides, post pics of them if possible also, and good shots of the tops.
Please post some more pics.

Panhead59 · Jul 1, 2021

I bought some neem oil just in case this happened. Got a decent scope. Won't be home till fri
Am. Hope it's not too bad by then.

Panhead59 · Jul 1, 2021

will do on pics bit it'll be Friday. Tks guys

Frego · Jul 1, 2021

tobh said:
the distribution of the spots look like pest issues to me. scope the leafs. the collapsing of the cells like that in nonuniform fashion isn't indicative of a nutrient issue ime, especially with how healthy they look otherwise. could be a consequence of the transition to lower rh as well. but definitely scope the underside of those leafs.

Noob here don’t mites attack the veins of the leaf also are you referring to a gnat infestation where they attack the roots and show tell take signs above soil??

second point
According to the graph arnt his numbers in the danger zone
26c
44%
I’m confused

UkSkunkLegends · Jul 1, 2021

Definitely Doesn't look like gnats to me , more like mites but the only way to see if it mites from a picture would be to get a picture of the underside of the leaf as this is where they lay eggs. Neem , I would also go a little bit weaker on the nutrients but only slightly .

Aqua Man · Jul 1, 2021

Frego said:
Noob here don’t mites attack the veins of the leaf also are you referring to a gnat infestation where they attack the roots and show tell take signs above soil??

second point
According to the graph arnt his numbers in the danger zone
26c
44%
I’m confused

It all depends on leaf temp and stage of growth. Don't use online charts they are garbage and will more than likely be quite a bit off.

Here is an explanation and below is a calculator for VPD leaf temps are absolutely crucial in using VPD.

VPD (vapor pressure deficit)

Ok i was gonna sit down and write out a whole article but i have been lazy so instead instead I'm going to copy paste because im lazy. This is not my work so let start. You may find this very long but its worth the read. Some may want to skip ahead. I have added here and there to what i feel is...

www.thcfarmer.com

VPD Calculator - Vapor Pressur - Apps on Google Play

Simple calculator to generate VPD based on Air/Surface Temps and Humidity.

play.google.com

Panhead59 · Jul 2, 2021

Ok got some more pics. It does look like something has been eating on a couple edges. Has not spread at all that i can see. 3-5 leaves effected, that's all. My new magnifing glass is garbage. Not nearly strong enough. There might be some tiny, and i mean tiny, white spots/possibly bugs on a few leaves. Zooming in with camera makes it look like lint. No bugs/pests that i can see with naked eye. Red "ball" by tip of pen looks like lint off of strings i am using to tie branches. Good pic of under a leaf. I've got some insecticidal super soap, made by Bonide, and some Capt. Jack's deadbug brew, also made by Bonide, on standby just in case one of em is what i need. I won't apply anything till i hear back from ya'll. Thanks for helping me. 4 weeks into flower, buds gaining size nicely, I'd hate to lose them now!!!!!

Panhead59 · Jul 2, 2021

2 pics on white, lined paper are bottoms of leaf.

1st real problem, 3rd wk into flower

1st real problem, 3rd wk into flower

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Never trust a doctor who's plants have died.

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1st real problem, 3rd wk into flower

1st real problem, 3rd wk into flower

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Never trust a doctor who's plants have died.

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VPD Calculator - Vapor Pressur - Apps on Google Play

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