Things were going so well and then this happens...

[menk]

Problem: Dark/dying patches

Soil - 2/3 OF with 1/3 Perlite

Feed: and supplements used: Fox Farm Trio give 1/4 dosage, feed every other watering. Have Cal-Mag but not used.

water source: Tap-Let it sit a few days then PH adjust to 6.5.

Strain/age: ILGM Blueberry Auto

light used: PlatinumLED P300 - (Started on Maxsisun 300w dimmable) - 18/6 cycle

Climate: Temps 70-80 -- RH 35-45

Additional info: Soil PH 5.8

Things were going fine until a few days ago, I gave her a feeding of 1/4 strength Big Bloom and Tiger Bloom and within the next 2 days this happened. Not sure what's going on...I didn't do anything different, (Ph'd water, added nutes). The only thing odd was that I Ph'd the soil a day before feeding and it was at 6.5. Checked this morning and Ph was 5.8, its never been that low.
Today I flushed the soil and added 1/2 strength Cal mag and 1/4 Tiger Bloom with water ph'd at 7.0. I'm not sure if this was the correct thing to do but things were going to hell quick and I'm just trying to stop it.
Any clues as to what happened and if i did the right thing to fix it?
Thanks

 

[Rev. Green Genes]

Problem: Dark/dying patches

Soil - 2/3 OF with 1/3 Perlite

Feed: and supplements used: Fox Farm Trio give 1/4 dosage, feed every other watering. Have Cal-Mag but not used.

water source: Tap-Let it sit a few days then PH adjust to 6.5.

Strain/age: ILGM Blueberry Auto

light used: PlatinumLED P300 - (Started on Maxsisun 300w dimmable) - 18/6 cycle

Climate: Temps 70-80 -- RH 35-45

Additional info: Soil PH 5.8

Things were going fine until a few days ago, I gave her a feeding of 1/4 strength Big Bloom and Tiger Bloom and within the next 2 days this happened. Not sure what's going on...I didn't do anything different, (Ph'd water, added nutes). The only thing odd was that I Ph'd the soil a day before feeding and it was at 6.5. Checked this morning and Ph was 5.8, its never been that low.
Today I flushed the soil and added 1/2 strength Cal mag and 1/4 Tiger Bloom with water ph'd at 7.0. I'm not sure if this was the correct thing to do but things were going to hell quick and I'm just trying to stop it.
Any clues as to what happened and if i did the right thing to fix it?
Thanks

Hi menk, sorry to see it. Thats a lot of browning leaf. It does look like a lockout. I think you are on the right track though.

Three questions, what sort of test do you do to get the soil pH reading, and are you measuring the pH of feed before or after adding nutes? And which specific calmag product are you using?

The LED lights known issue is cal mag deficiency, but during a lockout pH level, it is not being used anyway. unless calcium is given in a chelated form it is plant unavailable at pH lower than 6. But even chelated calcium is not used fully at less than 5.8

 

[GoAuto6]

You say you h then add nutes? You should be adding nutes then ph'ing... Also do you have a soil probe? So you can adjust your feed according to your soils ph?

 

[namvet25]

Looks like phosphorous def do to lock out also start of cal/mag def.If you haven't used calmag this is probably causing this problem.Damage is pretty extensive but you could flush with ph'd water than feed her 1/2 strength flower nutes with added cal/mag at one tsp.per cal.Continue giving calmag at every feeding and hopefully this will help.Next time you have a problem report it right away and not wait until it gets like this.

 

[menk]

Hey @Rev. Green Genes and @GoAuto6 thanks for the reply...I used an Accurate 8 probe to test the soil ph. I usually ph the water before adding nutes (though I’ve ph’d after a few times), but i’ve never had this happen before. I’m using Botanicare’s CalMag plus.
Only thing I can think is that my ph meter is out of whack, I ordered a new one so I’ll see what’s going on. This happened really quick...about 2 days. It wiped out nearly all of the sugar leaves and quite a few fans, I removed 8 - 10 fans that were completely cooked before I took the photos.

 

[Rev. Green Genes]

Some strains are very susceptable to low or high pH. More than others. The accurate 8 is a great one to use. It can get out of whack quick, it usually is harder to fix than it is to let it drift off course. Namvets advice above is perfect. The only thing I would add is using a foliar spray while she recovers.

 

[menk]

Soil Ph is up to the mid 6's.I'll follow @namvet25 's advice and keep the Cal mag flowing and see how it goes. @Rev. Green Genes what type of foliar spray do you recommend? I know absolutely nothing about those.
Thanks for the help.

 

[Rev. Green Genes]

Soil Ph is up to the mid 6's.I'll follow @namvet25 's advice and keep the Cal mag flowing and see how it goes. @Rev. Green Genes what type of foliar spray do you recommend? I know absolutely nothing about those.
Thanks for the help.

For a ready to use spray, you can't beat Optic Foliar. I always keep some on hand for this sort of problem. If I didn't have Optic Foliar I use whatever I have on hand. I check all my nute bottles for instructions and if it is advised to use as a foliar spray it will have directions for mixing it on the bottle.

 

[Waira]

- Menk..... I'm leaning toward a Mn defc.,... here's why: low inputs all along, and now high demands for micronutes as well as primary and secondary which are better covered even under low feeds; symptoms are all up top, a sign it's an immobile micronute defc., and they match well with the rare but always possible Mn defc.,... most of the micronutes ( includes Fe, Zn, Cu, B, Mn, Mo, Cl, etc.) are immobile within the plant, which means the plant can't translocate them from older established tissues to newer growth,.... I think, with that pH, this is a simple lack-of defc., just plain depleted,... many micros lock-out when pH gets past 6.8+pH.... acid conditions keep them in available forms.... Now this said, P defc, which also causes broader necrotic patches could be a co-defc. here, and it would also follow since demand for that is highest now, and from what I've seen, the plant won't necessarily tap into far lower fans first, but take from more proximal ones instead,... also causing that yellowing too,... So, the guys called it on the fix, and you did some things already too,.. I recommend a dedicated micronut supplement (Earth Juice Microblast is my choice), and also start feeding Tiger bllom at hiogher rates, like half str, to start,....ease it up from there perhaps, depending on her response,...
I don't recommend foliar this late in the game, too much mold potential, residues,... OF's Overgrow might make matters worse in fact, and it doesn't have Mn in it anyway,... only exception there would be with using Transport along with EJ Microblast,.. Transport is a carrier that allows temporary penetration through the leaf cuticle, allowing stuff to sink right in! In any case, you don't have much longer to go, so get on these ASAP before it's pointless,... buds looks OK though, and that's what matters most! Some extra PK will fatten them up some more before harvest.... Just try to keep that pH in the low to mid 6's...

 

[menk]

@Waira @Rev. Green Genes thanks for the info, I gave them 1/2 strength calmag and tiger bloom and the soil PH is right at 6.4 (the Microblast should arrive tomorrow). Whatever is happening is getting worse, its spreading and at this point I'm really hoping Im not going to lose her . I had trimmed most of the necrotic fans and smaller leaves back, but you can see in the photos its just spreading like a f@#*ing wildfire. Aaarrgghh. Man what a shitty feeling.