Spotted leaves, What's up...?

Vincent Vega · #1 (**permalink**) 12-07-2007, 12:41 AM

Plants are now in week 5 of their bloom cycle, and have all started to have these spots recently, but are otherwise healthy. They are fed with Dyna-Grow bloom 3-12-6, checked with EC trunchen and kept around 25 on the meter. PH is balanced between 5.8 to 6.0 after nutes are added. I have a total of 3200 watts in this room, on movers. Lights on temps stay around 79-80, and lights off temps stay around 74-75. Room gets CO2 injected by an atmospheric controller. Room has AC and heat source, fresh air intake, stale air exhaust, and lights are ducted and vented outside the room.

This is our third grow under all the same conditions and we have not had this problem in the past. I'm currently taking a hydroponics class and asked the professor about this problem without disclosing the type of plant, and he thinks they need more nutes. That's just the opposite of what I was thinking.

Any thoughts...?

jcj77d · #2 (**permalink**) 12-07-2007, 01:10 AM

have u looked for pests, it could be just that strain or plant. could be bleach spots from misting & the lights hitting the water drops. it looks like they will be ok. u can try changing the res & start over w/ fresh everything.

Vincent Vega · #3 (**permalink**) 12-07-2007, 01:31 AM

Grow room is very controlled, I'm quite sure there are no pests.

Plants have never been misted.

I have two 55gal drums for watering and they are refilled every few days.

I have tried flushing with just ph water but hasn't helped yet.

jcj77d · #4 (**permalink**) 12-08-2007, 07:28 PM

what strain are u growing. have u tryed adding h2o2 to the res or adding it to a flush

SmknVTEC · #5 (**permalink**) 12-08-2007, 09:40 PM

Are those in soil? If so your pH is off. Soil pH should be between 6.2-6.8 hydro pH 5.2-5.8. Check for bugs like jcj77d said. If you are sure there are no pests, it looks like it could be a calcium deficiency. Those spots don't rub off do they?

Vincent Vega · #6 (**permalink**) 12-09-2007, 04:11 PM

Quote:

Originally Posted by SmknVTEC

Are those in soil? If so your pH is off. Soil pH should be between 6.2-6.8 hydro pH 5.2-5.8. Check for bugs like jcj77d said. If you are sure there are no pests, it looks like it could be a calcium deficiency. Those spots don't rub off do they?

Yes these are in soil, and ph is checked daily and kept btw 5.8- 6.0.
No, the spots do not rub off.
I have inspected leaves with 30x magnifier and can find no evidence of pests.

jcj77d......I have six different strains in this room

Ganja Guerrilla · #7 (**permalink**) 12-09-2007, 06:28 PM

SmknVTEC is correct you have a PH problem, your growing in soil but using PH levels for soilless grow conditions, raise the ph to 6.8

jcj77d · #8 (**permalink**) 12-09-2007, 08:07 PM

yea, i didnt realize u where growin in soil, get that ph up 6.5-6.8

mrscooter · #9 (**permalink**) 12-12-2007, 02:38 PM

I had som plants that looked the same. on mine there was some pollen looking stuff on the underside of the leaf, it took some time to figure out but turned out to be mites.

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#2 (permalink) 12-07-2007, 01:10 AM
jcj77d POT GOD Join Date: Mar 2007 Posts: 9,859	have u looked for pests, it could be just that strain or plant. could be bleach spots from misting & the lights hitting the water drops. it looks like they will be ok. u can try changing the res & start over w/ fresh everything. __________________ The Beginners Guide To Get You Started in Growing Cannabis So you want to grow POT, your ?'s answered here. Learning how to show your Appreciation, Giving Thanks DIY HUMIDIFER/CHILLER POT GOD'S 1st ever Hydro Grow DIY Ebb & Flow for under 100$ How Light is Measured & Lighting Spectrum and Photosythesis Sig By BtrBR

#3 (permalink) 12-07-2007, 01:31 AM
Vincent Vega Registered User Join Date: Sep 2007 Posts: 3	Grow room is very controlled, I'm quite sure there are no pests. Plants have never been misted. I have two 55gal drums for watering and they are refilled every few days. I have tried flushing with just ph water but hasn't helped yet.

#4 (permalink) 12-08-2007, 07:28 PM
jcj77d POT GOD Join Date: Mar 2007 Posts: 9,859	what strain are u growing. have u tryed adding h2o2 to the res or adding it to a flush __________________ The Beginners Guide To Get You Started in Growing Cannabis So you want to grow POT, your ?'s answered here. Learning how to show your Appreciation, Giving Thanks DIY HUMIDIFER/CHILLER POT GOD'S 1st ever Hydro Grow DIY Ebb & Flow for under 100$ How Light is Measured & Lighting Spectrum and Photosythesis Sig By BtrBR

#5 (permalink) 12-08-2007, 09:40 PM
SmknVTEC Moderator Extraordinaire Join Date: May 2003 Location: Tornado Alley Posts: 8,084	Are those in soil? If so your pH is off. Soil pH should be between 6.2-6.8 hydro pH 5.2-5.8. Check for bugs like jcj77d said. If you are sure there are no pests, it looks like it could be a calcium deficiency. Those spots don't rub off do they? __________________ "I build cars for young men that only old men can afford"- Enzo Ferrari (1898-1988) LED Thread PGAMG Thread MG vs. Generic Soil Current and Legit Seedbanks GC Forum Rules

#7 (permalink) 12-09-2007, 06:28 PM
Ganja Guerrilla www.ganjaguerrilla.net Join Date: Jul 2006 Posts: 2,822	SmknVTEC is correct you have a PH problem, your growing in soil but using PH levels for soilless grow conditions, raise the ph to 6.8 __________________ Diagnose your own plants...Visit my site www.ganjaguerrilla.net

#8 (permalink) 12-09-2007, 08:07 PM
jcj77d POT GOD Join Date: Mar 2007 Posts: 9,859	yea, i didnt realize u where growin in soil, get that ph up 6.5-6.8 __________________ The Beginners Guide To Get You Started in Growing Cannabis So you want to grow POT, your ?'s answered here. Learning how to show your Appreciation, Giving Thanks DIY HUMIDIFER/CHILLER POT GOD'S 1st ever Hydro Grow DIY Ebb & Flow for under 100$ How Light is Measured & Lighting Spectrum and Photosythesis Sig By BtrBR

#9 (permalink) 12-12-2007, 02:38 PM
mrscooter Registered User Join Date: Nov 2007 Posts: 3	I had som plants that looked the same. on mine there was some pollen looking stuff on the underside of the leaf, it took some time to figure out but turned out to be mites.

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