Please help, brown spots and curling leaves

[btownbuddah]

I'm not sure when this started but I know it has gotten worse since I watered last about 3 days ago. I made the mistake of trying to grow multiple strains in the same room with the same formula. It seems that only one of the strains is effected. The effected strain is querkle (purple erkle x space queen). Unfortunatly, I trimmed away all the worst leaves before I took these pictures. Hopefully you can still get a good idea of what's going on. The room is way overcrowed as it is and even though it would be a shame this late in the game, if I don't fix this soon, I may have to consider tossing them. Lets hope it doesn't come to that.

This is my first time growing soil so maybe I overnuted. Also, the last watering had a lower pH of 6.0. I had previously been giving them 6.6. Everything else looks super healthy with fat nugs already after 3 1/2 weeks flowering. Now I'm really freaking out because today I found beginning stages of white powdery mold on some of the bottom leaves. I've been hitting them with tons of serenade and pruning so hopfully it goes away the easy way. The humidity is about 40-50%

I'm using foxfarm for the majority with about 20% of both perlite and coco mixed in. I have 5 gallon pots under 1000W hps and mh reflectors. C02 is about 1300 I think but I don't have a meter. They've been getting about 1300 ppm of nutes (1600 tds w/ karma and sweet). Room is usually 75-80 degrees. What should I do? Can I bring them back? Should I leech them? Or should I toss them before the mold spreads? Any advice is very much appreciated. Thanks

btownbuddah Reviewed by btownbuddah on 07-09-2009. Please help, brown spots and curling leaves I'm not sure when this started but I know it has gotten worse since I watered last about 3 days ago. I made the mistake of trying to grow multiple strains in the same room with the same formula. It seems that only one of the strains is effected. The effected strain is querkle (purple erkle x space queen). Unfortunatly, I trimmed away all the worst leaves before I took these pictures. Hopefully you can still get a good idea of what's going on. The room is way overcrowed as it is and even Rating: 5

[EnhAnceD]

Your pictures are not very good unfortunitly. Its hard to see exactly what your talking about. try using macro on the cam and getting close to one leaf.

[btownbuddah]

yea i know my friend took them

[btownbuddah]

I'll try to get some more on there tomorrow. If you look close you can kinda see some brown spots on the top and middle canopy fan leaves.

[cptcannabis]

Typically curling leaves is an indication of stress pointing toward a pH problem. Test your soil and make sure it's between 6.2-6.4 pH. Also if you started with a rich soil like Miracle Grow Potting Mix or something similar, if you added nutrients, you probably burned the plants a bit, causing that spotting.

[btownbuddah]

yea that's kinda what i was thinking. The majority of my plants are doing great though. Do you think I should mix up a different batch of nutes for the querkles? Shoiuld I leach them first? I've never grown with soil before. My general approach with hydro has always been to give them as much nutes as they can take. I've heard that some people don't even add nutes every watering. Is this reccomended? I use foxfarm ocean which has lots of fertilizer to begin with but i think most of it gets used up in veg.

[btownbuddah]

Ok these should be a little better. I've never grown with soil before so I don't know much about flushing/leaching. Is this something I should be doing anyway? I would really appreciate any help at all. Thanks again everyone

[phatsesh101]

the form man, the form

[btownbuddah]

S=Answer if you grow traditional soil (foxfarm with coco and perlite mixed in)



E-indoor or outdoor INDOOR

SCLR-Soil or slab runoff pH
E-Water source
TAP WATER 40 PPM
E-Source water pH
7.3 ORIGIONALLY, ADJUSTED TO 6.5 LAST WATER WAS 6.0

E-Age of plant
4 WEEKS INTO FLOWER VEGGED ABOUT 3-4 WEEKS
E-Type of fertilizer
SUPERNATURAL BLOOM, BUD BLASTER, LIQUID KARMA, SWEET
E-Rate of application (if hydro, this is your PPM number, preferably after each component is added)
1600PPM
E-Lighting source and distance from plant
4 1000W HPS, 1 1000W MH 18" FROM PLANTS
E-Air temperature (both day and night if you are running a dark period)
75-80 DAY 65-70 NIGHT
E-Air % Relative humidity
40-60 %
E-Lighting schedule
12/12
E-Type of ventilation your room has
SEALED ROOM EXCEPT AC WASTES SOME CO2
TR-Did you pre-soak your media in pH corrected solution?
NO

[Rusty Trichome]

Why are you mixing the coco in?

I'd flush well (two to three times the pot volume) with 6.8 ph water.

Mix per soil applications, not hydro. Big difference in needs.

If feeding daily, you are building-up the nutrient level to toxic levels and dropping the ph. Likely getting a salt build up as well depending on the nutes.

6.3 to 6.8 ph for peat based soil (and peat based soilless) mixes. :thumbsup:

I'd back off the additives till they are looking better.