Can someone try and diagnose my problem

Hi guys hope you can help with this I have attached some photos of some leaves that I am having problems with dying off they have brown rust like spots with a yellow tinge to the leaf and eventually wilt and fall off does anybody have any ideas ????

Calcium or magnesium deficiency, maybe?

I need a photo of the whole plant in normal lighting, like blue/white type fluorescent. Please describe how you are growing, what nutrient solutions have you watered with, and what have you sprayed on them. Believe it or not we need a good idea what your temps / humidity has been. Also please let us know the strain (if known) and it would help to know veg or flower with a description of the grow room.

Looks like too much Nitrogen (leaves are very dark green) alongside a Magnesium def

I see calcium, phosphorous and potassium or burn at least but that usually means things are way out of balance. We need way more info than random leaf pics to help someone.

Ok so here is the full run down I am growing 6 big buhhda blue cheese from cutting thet are 21 days into flower they are in a under current deep water culture system running on the shogun nutrient full line up including hydro bloom a and b , calmag, sumo boost (flower booster), Dutch master root zone , and just started using PK last night when I done a nutrient change which is every 7 days. They are under 2x 600w hps air cooled hoods with a 6" extractor running through them to a carbon filter and 4 inch intake the tent the temps have been 22 Celsius at night and up to about 27 max at day time (I know that's a bit high ) the humidity has been my biggest problem for about the last 2-3 weeks sitting between 50% and 70% but I did put a dehumidifier in the tent last night so that should be better from now on but unfortunately it has brought my temp up to about 28 the water temp is spot on as I have a large water chiller hooked to the system which keeps the temp at 19-20 Celsius at all times my ph has been stable at 5.8 - 6.0 never higher or lower and my EC level is 0.5 now never been higher ..... Hope this helps guys if there is anything else you need to know please just ask and I will do my best to answer thanks

too much N, and cal/mag deficiency, try letting your ph rise to 6.3 so you dont lock out cal/mag

Ok so I have adjusted my ph to 6.2 as to try and prevent cal mag lock out and adding the ok should bump up potassium and phosphorus so that should help also what else can I do? How can I reduce the amount of nitrogen ?

Any more help please guys I am losing a lot of leaves now and I'm getting worried I may lose the crop if something is not done soon what else can I try ????

Here are some better pics of the leafs anybody know what this could be please

View attachment 3785154 View attachment 3785155 View attachment 3785157 Here are some better pics of the leafs anybody know what this could be please

calcium deficiency

Thanks for the reply cindysid and I have adjusted my ph to 6.3 so it can uptake calcium easier but do I need to add more Calmag when doing nutrient change thanks

I think too much nutes. Especially the pk causing the cal problem. Maybe run a lower ppm?

And no pk boosters till you see improvement.

And you got to get the temps down a bit. The leaf edges are upturned and showing the stress.

They are transpiring hard and taking in too many nutes. Have to find environmental and nutritional balance.

They look like they are growing well though. Nice straight out white pistils and green leaves.

I hope a hydro guy will chime in with specifics for you I grow in potting mix. Good luck sir!

Mine just did the same thing! I thought it was a lack and it was a lockout/overdose of N. I flushed with some revive.

You probably don't need revive just had other plants that showed a lack of mobile nutes.

Ph is huge in hydro I think it was part of my problem I was getting pretty lax at checkin because everything was goin good.

Hi guys thanks for the replies I have been away so I haven't been able to reply but I have to say that I am still having issues with my plants the bud production has come to a stop I think aswel I have kept my ph at 6.2 I have lowered my bloom nutrients down to nearly half I have kept the Calmag at the same strength and the heat stress problems I am having there is not much I can do about that as my lights are as high as they can go and it's only the canopy temp that is high the ambient temp is spot on. And also I am confused about lockout and overdose arnt they opposite things ? Any more help would be greatly appreciated thanks

Bait head said:

Hi guys thanks for the replies I have been away so I haven't been able to reply but I have to say that I am still having issues with my plants the bud production has come to a stop I think aswel I have kept my ph at 6.2 I have lowered my bloom nutrients down to nearly half I have kept the Calmag at the same strength and the heat stress problems I am having there is not much I can do about that as my lights are as high as they can go and it's only the canopy temp that is high the ambient temp is spot on. And also I am confused about lockout and overdose arnt they opposite things ? Any more help would be greatly appreciated thanks

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For DWC ph should never be higher than 6.0 in flower. 5.9 is generally a sweet spot. Change your rez and just run with ph'd calmag water for a couple days. Then slowly add back base nutes, micro/grow/bloom. PPM of around 650 should be enough. Goodluck!

I called lockout an overdose, and they are clearly not the same. My error, sorry to confuse. I would use straight water and calmag like suggested above.

Edit: lockout is the plant stopping from uptaking nutes because it has too much nutes or the wrong ph.