Nothing I Have Seen Before

[dutch.lover]

I have some dark spots on quite a few of my plants leaves, I have never seen this before. Can anyone enlighten me? I am guessing it would be some sort of nute problem, except I don't think any of my plants are suffering from anything other than this (check out my grow log thru my sig, i just posted new pics of my vegging plants). So anyways, here are some pics.

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[attachment=o111747]

[GaGrown]

Dude you sure better look on the underside of that leaf in the pic!!!!! That looks just like the mite damage that my gurls suffered! Got a magnifying glass?Check for the crawling critters!The damaged parts on my leaf was white to brown to black! They even started to yellow some as well!I know for a fact my problem was not nute burn! It was FREAKIN' MITES! I hope it is just a nute burn!

Ga Grown!

[dutch.lover]

i really really hope you ARENT right. lol. We had a thrip problem (still sorta do actually), and therefore we have been spraying with insecticide like at least every week for the last couple weeks. so i would hope that it would be unlikely that it's a pest problem...but maybe i will go spray all the plants down again. fuck that. lol.

[dutch.lover]

come on guys... not one of the 25 who have looked at this knows whats going on? i have checked the charts with pics showing defs and burns, nothing seems to match up... i shouldn't have a pest problem, as mentioned above... anyone know? I have no clue what it is, and i would really like to fix it before it gets worse.

[GaGrown]

I did'nt say it was a pest problem! I said you should check!Try flushing and foliar feeding with plain ole' ph'd water.I'm just trying to let you know that the signs were the same.Does it look like a fungus,to you? Sulfur would work in that case.

Ga Grown!

[Cautios]

I do believe that I read such symptoms occur from root rot. Also the downturned leaf edges, as well as the discoloration could be result of some type of deficiency. There are plenty of guides that can walk you through that, but I'm sure you know that.

[Cautios]

Didn't read all the posts first, sorry. Well anyways. It could be multiple deficiencies instead of just one. Look for terms such a necrosis.

[stinkyattic]

Is that a peat-based soil?

[dutch.lover]

i wouldn't say it is peat based, but it has peat moss in it (along with top soil, sand, perlite, and worm castings). We pH'd the soil too btw, so pH really shouldn't be an issue. hmmm maybe I will flush them just to be safe. any other ideas? what were you thinking stinky?

[stinkyattic]

I'm thinking that your pH-ing didn't 'take' and that you have a serious pH problem. I've seen that before. What is the sand? Does it have limestone in it? Did it have a reddish tint indicating high iron? Minerals in your soil are BAD because they make it really tough to feed properly or keep the pH stable. You need to use totally chemically inert agents like perlite to make the soil more friable wihtout adding minerals by mistake. I'd take that sucker right out of its current pot and shake off the rootball just a bit, and repot it into KNOWN good soil, and then give it a nice drench with water at pH 6.8.

[dutch.lover]

hmmm... to answer your sand questions- we didn't add the sand ourselves, it just happens to be in the standard potting mix we buy (also has peat moss and perlite in it). We have all of our plants in the exact same soil mix, so i don't think that's the problem- although I really have no idea what else it could be. We have a pH tester, so maybe I will test the runoff water again and see how it is. We test the plants intermittently for pH, so maybe it's time to do that again. Thanks for your input, I hope you are right cause I have no clue what else it could be.

ps: some of our other plants have strange spotting too, but instead of darker spots, they're yellow. maybe that will help with the diagnosis...

[stinkyattic]

Maybe that batch of potting soil was not very well mixed and contained pockets of peat. That really looks ph-y to me anyway.
Did you do the runoff test yet?

[slowlickitysplit]

It looks exactly like what i had last week! I don't know what it was but I was overdue to repot. It has been about 4 days since I repotted and the problem seems to be clearing up. Only change I made was that I added 2 tablespoons of lime for every gallon of soil mix. I used Promix BX 50% and 50% perilite. Hope that helps.

[slowlickitysplit]

From the guildes the only thing else it could be IMO was a Ka deficiency which can be resolved by foliage feeding with 1 teaspoon (I think-better check!) of lime with a gallon of water. Let me know how it goes.

[slowlickitysplit]

Sorry. My problem looks to be Mg lockout. Got this from a plant health guide (this site???)...

Magnesium (Mg)
Magnesium is a component of the chlorophyll molecule and serves as a cofactor in most enzymes.
Magnesium (Mg) deficiency:
Magnesium deficiency will exhibit a yellowing (which may turn brown) and interveinal chlorosis beginning in the older leaves. The older leaves will be the first to develop interveinal chlorosis. Starting at leaf margin or tip and progressing inward between the veins. Notice how the veins remain somewhat green though as can be seen in figure 15.
Notice how in figure 16 and 17 the leaves curl upwards like they're praying? They're praying for Mg! The tips may also twist.
This can be quickly resolved by watering with 1 tablespoon Epsom salts/gallon of water. Until you can correct nutrient lockout, try foliar feeding. That way the plants get all the nitrogen and Mg they need. The plants can be foliar feed at ½ teaspoon/quart of Epsom salts (first powdered and dissolved in some hot water). When mixing up soil, use 2 teaspoon dolomite lime per gallon of soil.
If the starting water is above 200 ppm, that is pretty hard water, that will lock out mg with all of the calcium in the water. Either add a 1/4 teaspoon per gallon of epsom salts or lime (both will effectively reduce the lockout or invest into a reverse osmosis water filter.
Mg can get locked-up by too much Ca, Cl or ammonium nitrogen. Don't overdo Mg or you'll lock up other nutrients.


I don't know how to add a link. Hope this helped and keep us updated.

-Slow-

[dutch.lover]

first off, i havent tested the pH yet as i have been really busy but will do that tonight (accompanied with a flush as all the plants are probably overdue for one). also plan on repotting soon, and will try to put less peat in and more lime.

[PatrickHenry]

PH brotha, I think you have a nutrient lockout. See how the leaves are turning yellow and then dying at the tips? Get some distilled water from the grocery store (to ensure proper PH) and throw a tablespoon of epsom salt per gallon. That should clear it up for you.

Also, you may consider throwing in a nute that has some nitrogen, like fish emulsion (smells like crap, but works).

[dutch.lover]

I tested the pH of three plants with similar symptoms, and they were all 6.6pH. That's a good level is it not? Anyways, repotting is gonna happen soon (tonight if we pick up some more supplies) so hopefully that will fix things. Should I flush first before repotting them? I'm thinking yes...detox them! lol. umm don't really know what else to add right now...so thanks again for the help and i will let you know if/when things get better/worse!