Bit of crispy yellowness at end of leaf tips

polishpollack

polishpollack

Well-Known Member
The grower's question was: "Just trying to learn here, with coco how do you get them to decide to change up what they will absorb?"

Instead of LMAO, why don't you tell how plants can decide what to take up? (like the plant has a brain...).
A plant can only take up what is available and doesn't "decide" anything. If that were the case then we'd never see leaf tip death from too much nitrogen as plants would decide they have enough and stop. There's no decisions being made. If you over fert your plants, they will die, pretty simple.
 
CornerStone

CornerStone

Well-Known Member
I say lower your ppm. Its always easier to deal with deficiency than burning. lower the ppm and let her do her thing. some plants have higher sensitive to nutes.
 
worldspawn

worldspawn

Well-Known Member
Uggh my coco has turned against me. After my feed today the ppm went up to 980 and the ph (from 6) went to 5.2 :(

I've done a flush with just plain ph 7.1 water and the runoff was ph 5.7 :o I've just left the soil flushed and tomorrow will flush it again and start it back on a very low strength solution, like 200ppm. I'm just going to maintain that till i see my ph start rising again. Hate that this is happening late in my flower :cry:
 
polishpollack

polishpollack

Well-Known Member
worldspawn, what ppm are you measuring when you say it went up? the runoff? be aware that coco is going to trap nutrients. people say to treat coco like hydro but that's not right. you treat it more like soil, meaning you shouldn't need to add nutes too often.
 
worldspawn

worldspawn

Well-Known Member
Hey, just reporting back. The problem was ultimately diagnosed as fungus gnats. I spotted a few of them flying around and the condition of my leaves matches perfectly with pics of fungus gnat damage on growweedeasy.com. Apparently the gnats also lay larvae in the soil which eat the roots which I'm guessing was attributing to my low PH. I ended up just aborting my harvest, it could have probably used another week but the crops condition was going downhill fast.

I've got these gnats in my Vietnamese mint growing in the kitchen so I'm trying a few methods to kill them off. I've got fly paper, i've applied a neem oil top soil drench and I've also dropped an inch of perlite over the top of the soil. I'm also only watering it now when I see the leaves wilting a bit (gnats love moist top soil to lay their larvae in). I'm trying to get some diatomaceous earth to lay over the top too.

Starting my new grow now, just two pots - Pineapple Kush. Wish me luck :)
 
im4satori

im4satori

Well-Known Member
gnatrol works on the larvae or liquid BMC (biological misquito control )
both of which are bacteria and safe and very effective

neem wont do much for ridding gnats.. itll kill the adults but they'll be back the next day or even within hours, they reproduce and hatch so fast itll make your head spin

hang some sticky stuff but don't try and cure it by chasing the adults you gotta focus on the larvae

add gnatrol every week for 3 to 4 weeks and they wont come back
 
worldspawn

worldspawn

Well-Known Member
I cant seem to find anything with Bacillus thuringiensis israelensis in shops here. Found a product with Bacillus thuringiensis kurstaki but that seems to be targeted to caterpillars. I dont have an urgent need right now, the gnatrol should be here in 3 weeks.
 
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