Leaf discoloration and spotting starting

[RaggedyMan]

This is a rdwc auto grow (tyson & white widow) beginning its 6th week and lately been having a few of these turn on me. I use 2 mars hydro tsw2000 led lights (at 18") 24/7 and the full (or fool depending on how you look at it) array of general hydroponics flora nutes according to their mixing chart for "early" flower. The rez is currently at 480ppm. Ph ranges only from 5.7-5.9. I did boost the "bloom" nutes from 1ml to 2.5 per gallon (per GH's

chart). Also I was boosting the tds up 10 or 20 points every couple of days depending on how much they used the night before until I got to the 480 mark where I've stopped. It appears at this point it's only the Tyson but they're a bit ahead in the flowering phase than the white widows.
The other picture is of the Tyson side of my grow. You can see it's not affecting most of the plant yet, but I'm trying to fix it before it gets out of control if that's where it's heading.

 

[Herby Paisley]

Hi Raggedyman ... You said you were in your sixth week of flowering, I think your ppms are a lil low for that time frame at that stage you want your ppms up to 800 to 1000ppms, Everything else you seem to have in the right spot. Looks like you may have the start of a mag deficiency, You can use epson salt to help with that issue. You also said you have 2 2000 watt leds over them at 18 inchs that might be too close with that amount of light they could be stressing from that causing nute lockout.

 

[RaggedyMan]

Hi Raggedyman ... You said you were in your sixth week of flowering, I think your ppms are a lil low for that time frame at that stage you want your ppms up to 800 to 1000ppms, Everything else you seem to have in the right spot. Looks like you may have the start of a mag deficiency, You can use epson salt to help with that issue. You also said you have 2 2000 watt leds over them at 18 inchs that might be too close with that amount of light they could be stressing from that causing nute lockout.

Thanks Herby
They are autos so that's why the low ppm. I've only grown autos for the last year now and have never been able to get over 500 at anytime during a grow. I was afraid I'm pushing the limit now causing this.

Edited to add that they are 6 weeks from seed, not 6 weeks in flower

 

[Herby Paisley]

Thanks Herby
They are autos so that's why the low ppm. I've only grown autos for the last year now and have never been able to get over 500 at anytime during a grow. I was afraid I'm pushing the limit now causing this.

Edited to add that they are 6 weeks from seed, not 6 weeks in flower

Oh sorry.. I missed the auto part lol... Hmm what is the temp and humdity in the grow area?

 

[RaggedyMan]

Temperature generally runs between 70 and 82. Humidity is in the high 60's (inside the canopy). I have all my unused jar hygrometers (they are monitored through an app on my phone) and a humidity probe hanging just under the scrog screen. The probe is a switch to turn my humidifier on/off but since "the stretch" the humidity stays higher than I really want inside the canopy.

 

[RaggedyMan]

Found these underneath the canopy near the front of my grow. Couldn't have been there too long as I recently trimmed out some growth.

 

[Herby Paisley]

Temperature generally runs between 70 and 82. Humidity is in the high 60's (inside the canopy). I have all my unused jar hygrometers (they are monitored through an app on my phone) and a humidity probe hanging just under the scrog screen. The probe is a switch to turn my humidifier on/off but since "the stretch" the humidity stays higher than I really want inside the canopy.

You might want to try to get those temps down to 68 to 77 at 82 its pushing being too hot in there for them.