Blue Diesel Autoflower - Brown Spots on leafs - Any Diagnostics or Recommendations

[Tuskannabis]

Hey,

I wanted to post some pictures of my latest Blue Diesel autoflower grow. She recently started to have discolor fan leafs with brown spots mid flower. I looked online for leaf symptoms and my best guess would be that she has a calcium deficiency. Before any of these symptoms started to appear I was upping the nutrient ppm levels from 700ppm to 800ppm. The grow is a low pressure aquaponic set up in a five gallon bucket with about 1.25 gals of nutrient/water capacity. There is leaf tip burn from the high ppm level so I backed down to 600ppm. Not sure if that blocked the uptake of calcium to the plant. I just gave her a dose of cal/mal supplement. maybe tomorrow I'll flush with ph'd for a bit then add nutrients at 600ppm.

Let me know if you guys/gals have any advice or recommendations on what these brown spot leaf symptoms could be. I really appreciate your help and hope to hear back!

Best regards,

Mike

 

[Snoopy808]

Possibly a calcium deficiency but not likely this far into flower.
She is well fed! Your explanation is pretty sound. Cal mag wont hurt and surely help swell those if needed. And pHd water to flush is wise. You've pushed the feeds heavy so a flush will help.
But if not calcium deficiency....phos and potassium deficiency or excess

This will help

https://www.loudclouds.co/wp-content/uploads/2016/07/marijuana-deficiency-chart-jorge-cervantes.jpg

 

[Tuskannabis]

Possibly a calcium deficiency but not likely this far into flower.
She is well fed! Your explanation is pretty sound. Cal mag wont hurt and surely help swell those if needed. And pHd water to flush is wise. You've pushed the feeds heavy so a flush will help.
But if not calcium deficiency....phos and potassium deficiency or excess

This will help

https://www.loudclouds.co/wp-content/uploads/2016/07/marijuana-deficiency-chart-jorge-cervantes.jpg

I'll flush it tonight, just to be sure. Thank you for your input and the url link. I just need this to stop spreading before it gets to the flowers.
-Mike

 

[Southernontariogrower]

are you ph ing?

 

[Tuskannabis]

are you ph ing?

Yes, I check every other day and ph to 5.75. Now it looks like I'll be checking everyday. See my reservoir only holds about 1.25 gals of water. She drinks almost a gallon every two days, by the second day the ppm levels spike until I refill to max water capacity. She uses about 250-300ppm of nutes every two days too, so when I refill the water I also top off the ppm level.
-Mike

 

[Southernontariogrower]

Yes, I check every other day and ph to 5.75. Now it looks like I'll be checking everyday. See my reservoir only holds about 1.25 gals of water. She drinks almost a gallon every two days, by the second day the ppm levels spike until I refill to max water capacity. She uses about 250-300ppm of nutes every two days too, so when I refill the water I also top off the ppm level.
-Mike

Try 6.4 your ph is too low raise it, l water every second watering at 5.4 bc l like the growth l get, but 6.4 is what you should shoot for.

 

[Southernontariogrower]

The necro spots are from too acidic feed, purple and yellowing are soon to come. Already are. Looked again.

 

[Tuskannabis]

Try 6.4 your ph is too low raise it, l water every second watering at 5.4 bc l like the growth l get, but 6.4 is what you should shoot for.

Yeah, I'm about to do a flush right now.. I'll try 6.4 and see how she reacts. Thanks

 

[Southernontariogrower]

Yeah, I'm about to do a flush right now.. I'll try 6.4 and see how she reacts. Thanks

It will solve the issues, best of luck in your grow. Hope to see you on site.

 

[Tuskannabis]

It will solve the issues, best of luck in your grow. Hope to see you on site.

Alright so now she's just in ph'd water for tonight. I'm assuming flushing should only be for a day or two? Yeah this is my first grow post but definitely will be on the forums. Maybe log a grow journal. Thanks again.

 

[Tuskannabis]

This is just a follow up report of the nutrient burn fix. I believe the plant is in stable condition now, she's not burning anymore leaves. I stopped feeding with every water refill and will only feed once a week just adding ph'd water when the water level drops. I ph to 6.4 now and by the second day when the water level drops the ph drops too so I have a good ph range to work with now to make sure all nutrients will be available. I'm not sure if this saying/motto is correct but "Light is the fuel, nutrients are the supplements". I'm going to see if less is better at this growth stage. Thank you @Southernontariogrower and @Snoopy808 for your help.