Brownish spots, burned looking leaves?!?!?!?!?!?!?

I have 3 plants, looking mostly happy, the largest being about 4' tall, and the smallest around 2 1/2' tall.
They are all about 15 weeks old, but within the past couple of weeks, the largest plant has started to get sporadic leaves about mid-stalk getting brown spots. having a burned look to them, and feeling dry as though burned, getting this way within a 6-8 hour period usually.
I don't find any insects, and I know they aren't burned, as the leaves above and below aren't getting the same affliction.
Any ideas or guesses?

Ca/Mg. need more.

OK, I sprayed with epsom salt (1 tsp per 1/2 gal.), yesterday evening, and am getting a little worried, the spots seem to be moving up the stalk and beginning to show on some of the smaller leaves also.
My other two plants are fine, but another thing I noticed is the overall color of this plant seems to be a brighter shade of green than the smaller two.
Am I just over-worrying or what?
Should I continue to spray with the epsom salt for a couple days?
If it makes any difference, I am about 3-4 weeks since I saw the first fuzz after the white hairs

These things dont fix overnight. Give it a few days and then judge if its working.

Problems with Calcium being locked out by PH troubles
here is a pic look similar?


Very acidic soils with excessive potassium, dry and or wet soil. Lack of calcium in the soil may cause too acidic soil. This may cause to Mg or Iron deficiency or very slow stunted growth
Soil
Calcium gets locked out of soil growing at ph levels of 2.0- 6.4
Calcium is absorbed best in soil at a ph level of 6.5-9.1 (Wouldn’t recommend having a ph of over 7.0 in soil) anything out of the ranges listed will Attachment 285804to a
Calcium Deficiency.

Hydro and Soil less Mediums
Calcium gets locked out of Hydro and Soil less Mediums at ph levels of 2.0- 5.3
Calcium is absorbed best in Hydro and Soil less Mediums at ph levels of 5.4-5.8 (Wouldn’t recommend having a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil less mediums is 5.0 to 6.0. Anything out of the ranges listed will contribute to a Calcium Deficiency.

Solution to fixing a Calcium deficiency
To fix a calcium deficiency you can treat by foliar feeding with one teaspoon of dolomite lime or Garden lime per quart of water, Or Any Chemical/Organic nutrients that have Calcium in them will fix a Calcium deficiency. (Only mixing at ½ strength when using chemical nutrients or it will cause nutrient burn!)
Or you can take crushed up dolomite lime or garden lime in a gallon of water and water it in the soil. 1 to 2 teaspoons per gallon of water, which will be slow acting. Garden Gypsum, which is medium absorption. Limestone, which is medium absorption, Rock Phosphate and Animal wastes which are both medium/slow absorption. Note: Caution when using gypsum to an already acid soil (pH that is less than 5.5) can have a very bad effect on different types of plants by effecting the absorption of soil aluminum, which is poison to plant roots.

[attachment=o285817]Wow! Thanks Bloomin for that burst of info! I went ahead and sprayed again last night right at dusk, and this morning the spots seem to be contained and not spreading anymore, and the overall shade of the plant is beginning to get lighter like the other two plants. For a while there, it was slowly getting darker, but the foliar with epsom seems to be working, so I'm going to play it by ear, and maybe spray again tomorrow depending how they look.
Here is the pic again of what they look like before they (just a few, has been only the mid-height ones) shrivel up and dry out.
Thanks again for the info! It is helping! :thumbsup:



[attachment=o285817]

Quote:

---

Originally Posted by imchucky666

[ATTACH]285817[/ATTACH
Thanks again for the info! It is helping! :thumbsup:



[attachment=o285817]

---

No problem, I like to see success.

Attachment 287316
Is this the same Deff.? Started on the bottom leaves and moved its way up. i clipped the first set when they died and added cal mag. 300 ppm but now its moving to the next set. ph is 5.9. what should i do?