I'm stumped! Would like to know what this is before I lose my whole crop :(

Hi, I am new here, but I have been growing for a few years now. I don't know what I am dealing with now, and it is just devastating. The plants will be growing fine, and then they start getting these brownish spots and then they wilt and die. If I am lucky enough to get them to finish they are yellow and gross looking. Here are some pics. The first three are in flower wk 5, wk 5, wk 8, and the leaves are in this order: flower, flower, veg, veg, veg, flower. I do have a few guesses, but I would like to hear some other opinions before I throw out what I think it might be. Thank you!!!

r u growing in a soilless like sunshine#4 or pro mix?

Nutes, schedule,type? soil,hydro,recirc? PH? PPM of nutes, water RO or what is it's ppm.

Since your problem is consistant, odds are severe nute burn/lockout or ph issue

Soil(happyfrog) Foxfarm nutes (Big Bloom, Grow Big, Tiger Bloom, Open Sesame, Beastie Bloom, Cha-Ching) with some snowstorm, gravity, crystalburst, and roots excel. I use less nutes than the schedules call for. I use the tall boy water filter, but not RO. I have been on the same nutrient schedule with the same strains for a while, and this problem is recent. Not sure of PPM, but my friend who uses my nutrient schedule tested it at 800 a while ago. It has been a little hot in one room, but this is happening all over. I have four different rooms.

Also looks like overfert to me...so the only thing you haven't tried is extensive periods of just water I take it?

I use one nute for veg, one for flower...no reason to have all those additives and what not...

and it might be good on the schedule, but ummm, it's not showing up good for your plants...so regardless of all that it is time to rethink your nutes...

I use fox farm nutes too. If I use them like they recommend it frys my plants. Very similar in looks to yours. I have been using the them at 1/5 strength every feeding. Plants are happy and growing big. Good luck.

I have been watering very lightly for a couple weeks now, thinking it might be nutes. I'm thinking a fungus, as I've spotted some fungus gnats. The pictures under the light are doing it no justice. The plants turn yellowish brown and it's almost like they just commit suicide in week five or so. I spray with neem and excel fungicide every four to five days and figure this should have taken care of a fungus problem?

I would go with straight water for 2 weeks or so, see if they perk up.

All the pictures of the leaves are early stage of it, then the plant almost browns up overnight and then gets worse in the last few weeks. Any plant I have thrown outside has recovered and is looking great though.

Let's get away from the nute thing for a minute. I'm thinking fusarium or pythium. Sometimes they just wilt overnight looking like overwatering, but not being overwatered.

Lower the nutes and make sure your water is ph'd

There is also little black spots on the top of the leaves that you can't see in the pics.

Take some of the guess work out of it and buy a PPM meter($25-$50). Check the levels of the nutes youre feeding it and check the run off level. It looks like the same problem i used to have with FF products. Flush them babies now!

Please look at the pictures better. It is not nutes. I have been growing the same strains on the same schedules for a couple years now, I know a nute problem when I see it and this is not a nute problem. I wouldn't be posting here for a nute problem. Nutes do not make a plant brown up and die like they are. Plus, it's only some plants, not all. It will start in one spot and then spread, like a mold or a fungus. The fungus gnats being there are not good. Is this what they do to a plant? The third pic in of the bud, if you look closely you can see what I'm talking about.

oicu4202 said:

Any plant I have thrown outside has recovered and is looking great though.

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Really? they recover after looking like they do in the photo's ? So should we concentrate on the environment? You think you might have an infestation wherever you are growing inside? Maybe extreme temp/moisture/air deprivation issue? I would thing if it's a fungus or such, it would stay with the plant even if you take it outside. I have never seen knats tear the hell out of a plant like that. interesting.

I was going to say a bad bag of happy frog. Do you use those other nutes in grow because HF is fine by itself i'm sure you are aware of, its fortified.

Here are some more pics of the week sevens with the light off, maybe this will help clear things up that it's not nutes.

That's why I'm stumped

patlpp said:

Really? they recover after looking like they do in the photo's ? So should we concentrate on the environment? You think you might have an infestation wherever you are growing inside? Maybe extreme temp/moisture/air deprivation issue? I would thing if it's a fungus or such, it would stay with the plant even if you take it outside. I have never seen knats tear the hell out of a plant like that. interesting.

I was going to say a bad bag of happy frog. Do you use those other nutes in grow because HF is fine by itself i'm sure you are aware of, its fortified.

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Pretty sure it wasn't a bad bag of the frog, since this has slowly developed over time it seems. I just sterilized my whole house, and the temp is a little high, but not ever over 90 during the day or over 50% humidity. I have multiple fans, filters, etc. so air quality is legit. I only spray an hour before the lights come on, so that's under control. I guess a good description of it is it looks like the lights are too close and the plant is burnt, but this is not the case.