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I give up, what causes this leaf necrosis?

Discussion in 'Marijuana Plant Problems' started by Randm, Jan 23, 2013.


    Randm Active Member

    I've searched all the marijuana trouble shooting guides I can find, but have not seen anything that looks like this. I am hoping that those with more experience than me can point me in the right direction.

    FoxFarm Ocean Forest soil
    400 watt MH lamp about 2 ft. above the plants.
    watered with well water, ph 7.0
    strain: Chronic
    Nutriants: None yet

    PA150013.jpg PA150014.jpg

    This particular plant is my Chronic Mom that is aproximately 2 months of age.
    I have seen this on several other of my plants at various stages of growth, from very young to flowering adults.
    ( Yes I know that they have evidence of spider mite infestation, I already treated with mighty wash about 3 days ago )
    This has been a persistant problem that shows up in my grow room on a regular basis, it doesnt seem to get too bad, at least not much worse than what you see here in the pictures, but I am stumped as to the causes of it.

    Any help would be apreciated, thanks in advance

    hexthat Well-Known Member

    most likely is burn from spraying.... I used one time 1 part SM-90 5 parts water with 2 tablespoons of neem oil per gallon in veg and have been spider mite free for 3 months.

    try watering with pH 6.5 its said to be better for soil

    dirtysnowball Well-Known Member

    that would be Phosphorus deficiency. any chance you PH your water, if so you should stop. the plant looks slightly hungry

    dirtysnowball Well-Known Member

    and for the mites, get cayenne pepper and garlic, blend them, and spray

    hexthat Well-Known Member

    maybe if he has purple stems

    ~Dankster~420 Well-Known Member

    Hey bro! It also looks like "Phosphurus" deficiency to me aswell! Although I may ne wrong. But from looking at this chart I'm going post 4 you, it seems like it is. Idk if you've seen this chart or not. But I use it to judge my deficiencys if I ever have any. Don't give up bro just because your having some issues! I know it sucks! And you get tired of dealing with shit of this nature! But look at it like this. We've ALL have had our share of problems such as this, your not in the boat all alone. ;) also, if it where me, I would take your plant/plants & put them in another room/closet or what have you, if possiable, & start treating them every other day with your "spider mite" regemine, atleast for a week! In the mean time, be cleaning your grow room, walls/floor/ceiling/ everything in there really! Make sure you wipe down everything!! I would use a "mixture of whatever your using to treat your plant/plants, "neem oiil" is what I used to treat mine & also wipe down my grow area with, & I havnt had not one issue with the little bastards since!! I hate them fuckers!! There the devil :twisted: !!! Anyways, that should fix your problem. Also, try in get that PH level down a few notches. ;) hope that helps bro..

    Randm Active Member

    Yeah, I've seen the charts, but not my particular problem on them.
    Mighty wash is a very effective mite killer but has no deterent powers. So I just use it when I see em. I'm sold on it as it is 100% enviromentally safe and it works. ( Just wish I could figure out how to make my own :) ).
    I did consider phosphoras def. as a possible, but they have only been in their current soil for about 4 weeks, since transplanting into a bigger pot, and I didn't think FFOF was phosphoris deficiant. I usually don't start feeding until around week 6 or so as the soil generally has enough to keep them going that long at least.
    Maybe I will start using ph down to bring the ph into a more acceptable level like 6.5 or so, when I water and see what happens.

    Thanks guys, any input appreciated.

    ~Dankster~420 Well-Known Member

    Well bro, you could always use a "base nute" somthing that would have all the nutrients in it, & that would 4 sure NAIL the problem!! And wouldn't hurt a thing either! Hell, I use a base nutrient, Jungle Juice weither or not they need it or not, & its never hurt um! And I've been growing for 13+ years or so. And although over the years my nutes have changed, I still do almost the samething I did back in the day! Well, when I got my groove on & was able to grow from seed to flower without having any problems!! ;)

    Randm Active Member

    Good idea. Sounds like you have your grow down.
    I've recently started using Jacks classic Citrus feed as a general purpose plant food. Its a 20-10-20 with magnesium (1%), sulfer (4.9%), Boron ( .02%) , copper (.05%), Iron (.15%0 Manganese (.075), Molybdenum (.0009%) and Zinc (.05%). As an all purpose that I feed my plants in veg as well as in flower.
    I'll check out the Jungle Juice later and see what it looks like.
    I tend to be wary of overfeeding my plants and try to give them what they need as opposed to force feeding them. I'm just trying to learn to 'read' my plants to see what it is that they are really in need of rather than having to deal with overfed plants.
    Also I really need to get a ph pen rather than useing the ph strips, as that would prove more accurate.
    Do you use any particular 'bud builders' or any other flowering type nutes or additives to increase bud and trich growth?
    Thanks for any input, good advice.

    ~Dankster~420 Well-Known Member

    I hear ya bro! Well, I don't claim to "know" it all by far!! Hell, I find myself learning "new" grow techniques everyday! One never stops learning! ;)

    And YES you do need to get yourself a PH instrurment! I just gote one of those "Burpee" garden helpers "electronic soil tester" at K-mart! It was 8.95$!! Its a PH reader & also tests the fertility in your soil aswell, with the flip of a switch!! A lot less the a "pen"!! And does the exact same thing, except the pens don't test the fertility of soil!! ;)

    And that's the good thing about the base nute "jungle juice" its not too strong to where it would "over power" your babies.

    And the only type of nutes I use during flowering are: on some I use Foxfarm Tiger Bloom/Big
    Bloom, the 1st 2 weeks of flowering, then switch over to Foxfarms Beastie Bloomz, then finish up with Cha-Ching, the whiole time using "Grandma's" Molasses unsulphred & also sensi-cal Bloom.

    On my others I am using: General Organics Bio Thrive "Grow" for vegging,Camg+,also General Organics Bio-Root, & for flowering I use General Organics Bloom, also the Molasses, & jungle juice with these.

    I have herd good things about the "Jacks"!! Keep up the good work though!! And 4 real bro, keep in touch, and stop in my grow & let me know what ya think! Located in signature. Later.

    *BUDS Well-Known Member

    Im 100% sure this is light burn, its affecting the thinest parts of leaves (edges and tips) . Raise the light ,the burnt area wont recover and dont be suprised if this bleaching/burn has affected the plant's health in general.

    Randm Active Member

    I've been using the Seablast transition and Seablast bloom as well. They are made by the same company I believe. Also the Microblast as a suppliment, as well as molassas. I'm still not sold on bud builders. I've read pros and cons and am trying to keep it simple.
    Thanks for the tip on the ph meter, I'll check it out next time I'm in town. I guess from what I am seeing is that I really need to get a handle on the ph. as thats probebly the first step in resolving this delima. Flushed the worse looking plant last night and did a low nute feed, so we shall see how that goes.
    I've got a Critical by Royal Queen thats about 3 weeks from harvest that was also showing signs of the same. Just feeding normally and keeping a closer eye on the ph. Buds and Trichs look good so far, just wish I had vegged them a little longer though. Not nearlly as much stretch as advertized.
    Not a critical problem apparently, As I said I am just trying to learn to read my plants and this was something that I considered an indicator. Figuring out just what it is an indicator of is the hard part. For now I will just consider PH as the main culprit. And try to improve my monitoring of it.

    Thanks again for all the input.

    *BUDS Well-Known Member

    Oh ok then.
    Guitar Man

    Guitar Man Well-Known Member

    How often are you watering? Also, do your pots drain?

    Randm Active Member

    PA160016.jpg PA160021.jpg

    Picts of my Critical from Royal Queen Seeds. Comming along nice, just wish I had left them in the grow room longer.

    ~Dankster~420 Well-Known Member

    Hell yeah bro!! Shit. I think they look good!! Your doing a good job!! How long you been growing bro??

    Randm Active Member

    Thank you. Been growing since it became legal for me to do so, about 4 years. It hasn't been an easy road at all, I made a bunch of mistakes that caused me untold hours of frustration and lost sleep. I grow in an shed in my back yard and makeing it all happen has been a chore. Proper ventilation and temp control where my biggest problems which I finally conquered with the addition of a swamp cooler to my flower room and 2 inch thick foam insulation all the way around it.. Also 2 more 400 watt lamps helped. I had almost a year of real crappy results and could not for the life of me figure out why. I was ready to just call it quits. I gave it one last shot and re-built the air intake system, cooling system and as I said, more insulation all the way around it. Now with a good supply of fresh air, proper heating and cooling, and (6) 400 watt lamps in an 8 ft. x 8 ft. flower room I may be on the way to actually getting a respectible harvest out of this. Plus I made up my mind to get the best genetics I could find. No more trying to do it with cheap genetics.
    This is actually the first harvest I will have out of there since the re-build, so I have my fingers crossed.

    ~Dankster~420 Well-Known Member

    I hear ya bro!! Good 4 you.! ;) its always a joy 2 hear about other sucess storys! And about the grows, & last but not least!! Bud porn!! ;) I know exactly what your talking about! Yeah, you gotta get into your "groove"!! ;) b4 you a "grower" can really have good results! I've been growing for over 11+ yr's myself. 1st started out growing outdoors! But had a lot of problems with damn "theives"!! That was really my main issue!! My dad had taught me almost everything he knew about growing back then. If not, then I know I would've had a shitty start! Lol. God rest his soul! ;) anyways, he is in a better place I know!! ;) and I know he's helping me & looking down on me & my grows! ;) now I been growing indoors for a good while! Don't get me wrong. I still have my occasional problem here & there! And I don't claim to "know" it all! Cause I don't!! Hell, I find myself learning "new" growing techniques everyday!! I still enjoy growing as if it where my 1st time honestly! It has a real sastifying affeect on me! ;) I love it! Also growing in my garden, & my roses!! I just recently added a 800watt LED system to my grow myself. It was just given to me by a LED company! All I did is ask to test out there products & that I would provide a grow journal in return,lol! And it worked!! Couldn't believe it! And still can't!! I also have a 400watt HPS for flowering, & during my vegging hours I just switch the HPS out with a 1000watt MH. I also have 3 300watt CFL'S & 4 120watt CFL'S, also a few blue spectrum CFL'S in there as well. Just hope its enough light!! I had really good results with the 1000watt Metal Halide! And the 400watt HPS. Just recently added the CFL'S & the LED system! So, it should produce alittle more, wouldn't ya say?? Well buddy, hope all is well your way. Hollar at me when you get a chance! Take er easy.. Dank.

    jpill Well-Known Member

    could be your well water.

    Krondizzel New Member

    Your PH is way off. That's what I call PH meltdown :)

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