Rusty brown spots all over late in flower...Advise PLEASE

I got yhese rusty brown spost and dont know if is Mg or K def....or if its that at all. Im day 70 from switch to 12/12 so im close bout 10-14 days away. strain is Triple OG. GH nutes w/ Hygrozyme/great white and Humbolt crystal burst. ppm was 1300 ph5.5 but now im weening down and at 900ppm 5.9ph. Start with RO H20 ppm0. 4x1000w HPS. Colas are still white pistls and all 20 of them are still trying to fill in and plump. other than the leaves and slowness, all looks beaut. id love a bit of advice..this ones over my head.



THANKS ALL!

Have you got spider mites? Check that first. Otherwise, I'd be interested to know, as I had this, and never really diagnosed it (I looked, but never found any spider mites, so it can't have been them)

I found that the yellow dots soon spread, causing thickened yellow leaves between still green veins...which then very sloly died off from the tip. It isn't N deficiency that's for sure.

Some more likely suspects for you if it isn't bugs are Mg or K deficiency...or the early signs of over-fert even.

Calcium deficiency. No big deal this late, but cal/mag would be a good tool for you in the future. No mites, I see no evidence of that in any of your pictures. Your ph is low, 6.5 is Ideal. Calcium is not utilized properly at such a low ph. At least keep it at 5.8-6.0. No worries brother, everything looks fine, and the rust spots will not affect your product in the least. Try to lower the N and add Cal/Mag to your arsenal next time. Adjust accordingly, as this will increase your ppms and up the nitrogen.

Don't worry, it might be ugly, but you're still ok.

This only happens to my plants when my ph fluctuates or is too high.What medium do you grow in?

GrnMn said:

Calcium deficiency. No big deal this late, but cal/mag would be a good tool for you in the future. No mites, I see no evidence of that in any of your pictures. Your ph is low, 6.5 is Ideal. Calcium is not utilized properly at such a low ph. At least keep it at 5.8-6.0. No worries brother, everything looks fine, and the rust spots will not affect your product in the least. Try to lower the N and add Cal/Mag to your arsenal next time. Adjust accordingly, as this will increase your ppms and up the nitrogen.

Don't worry, it might be ugly, but you're still ok.

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It does resemble ca def but ca def would have started from the side of the leaves,nut u are right about how much it don't matter i got some plants that looked almost the same but a 16.9 oz bottle of purified water fixed it.

HotShot7414 said:

It does resemble ca def but ca def would have started from the side of the leaves,nut u are right about how much it don't matter i got some plants that looked almost the same but a 16.9 oz bottle of purified water fixed it.

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Cal def will start from veins but affect entire leaves. This late it could be ph, nute lockout due to phosphorous toxicity, or just plain not enough calcium and magnesium. It's fine though, and even if you decide to supplement (check all basics first, ph, ppm, salt buildup) your leaves will not heal. they'll look like that and get worse, but this won't affect your product this late in flower. No worries brother, best of luck, and hope to see your outcome in the next few weeks!

Jason

looks like mites? check under your leaves

Saldaw said:

looks like mites? check under your leaves

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Looked again, this is possible though I see no webs at all. This late, and with that amount of rust, you should have webs at the base of your fan leaves and the tips of your colas. Check anyway, and if you find this to be the problem, spend a few hours wiping all leaves top and bottom with a heavy solution of dawn or lemon joy and water (very soapy, pretend you're washing a burnt greasy pot).

I hope its not the borg (spider mites) as they are almost impossible to eradicate. If it is mites, you will want to cease your op for a few months and sterilize everything. Once you're certain you are clean, grow a few test plants (strawberries and squash are good testers) before continuing your grow.

It's calcium add a little calmag and see what happened old growth won't heal but if it stops spreading you know you fixed your girls make sure it's not a ph issue before you add any thing.

Wow..thanks. all great advice. First im growin in 6x6 hugo rockwool in trays w/ top drip sys dual res. 35gal each. I have gone throught the mite thing and have a handle on it. my trick is azamax in the res at a lower dose than recomended through veg and into the first week of flower. thats it....it has been workin for me great the last two times. before that I got the mites real bad(not bad enough to loose the battle) but I had to stop and clear out everything and clean clean clean!. And ive got and tried it all with varied results, Azamax/Floramite/Forbid/mighty wash/liquid ladybug/D.E./the list goes on......they all have their special time of need.
Back to the point. Because these girls are going longer than expected, im week 11 from switch, the azamax built resistance is wearing off and one of the girls in that pic did have a few mites but only on one cola. and i went through allthe others...not a trace. so whatever this is is not from mites cause its the same on all of them. I tend to lean toward ph cause ive been running an average PH of 5.2 to 5.5 some times as low as 5.0. Im still learning to read the early signs of the plant to tell you what it needs, but that takes some time. I was under the impression that hydro likes 5.5 but this might be low. also I have been running my ppm higher than i normally do because i recently switched to R.O. and see how much better they respond the nute water. I topped out at 1300ppm at peak flower and now flushing. They just seem like they are filling out slow. Ill put up some more pics when the lights come on later. Im just worried about the final...its my bread and butter... thanks again all! -Chop

Here are some new pics. now that they are on flush, its not getting better but its not getting worse...lol