Need help

[xsnoder]

Hi everyone, Need help.
Some redish rust color spots have appeared on a few leaves of two of my plants during flowering. The spots aren't ,really, going crazy but definitly spreading when they show on a leaf? Checked k-def? and trying to apply a mild n-p-k but am unsure if the spots and yellowing aren't normal for some strains during flowering?
My medium is Sh. peat 75%-- 25% mixed soil. First time using this type of medium.
total ph for that mix is around 5.0 I believe
I feed one with BC products and the other with Fox farm products.
Both plants show signs of the spots but when the little plant shows spots on a leaf, it will spread across the leaf pretty fast.
I am new to growing indoors and in soilless applications. Any help would be very much appreciated.

xsnoder Reviewed by xsnoder on 01-08-2011. Need help Hi everyone, Need help. Some redish rust color spots have appeared on a few leaves of two of my plants during flowering. The spots aren't ,really, going crazy but definitly spreading when they show on a leaf? Checked k-def? and trying to apply a mild n-p-k but am unsure if the spots and yellowing aren't normal for some strains during flowering? My medium is Sh. peat 75%-- 25% mixed soil. First time using this type of medium. total ph for that mix is around 5.0 I believe I feed one with BC Rating: 5

[jaydee84]

Hi everyone, Need help.
Some redish rust color spots have appeared on a few leaves of two of my plants during flowering. The spots aren't ,really, going crazy but definitly spreading when they show on a leaf? Checked k-def? and trying to apply a mild n-p-k but am unsure if the spots and yellowing aren't normal for some strains during flowering?
My medium is Sh. peat 75%-- 25% mixed soil. First time using this type of medium.
total ph for that mix is around 5.0 I believe
I feed one with BC products and the other with Fox farm products.
Both plants show signs of the spots but when the little plant shows spots on a leaf, it will spread across the leaf pretty fast.
I am new to growing indoors and in soilless applications. Any help would be very much appreciated.

are you giving ferts if not i would try something with N P K in it normally lack of fertilizer nitrogen lack will cause these problems are the steam also redish color have you had problems with spider mites

[xsnoder]

are you giving ferts if not i would try something with N P K in it normally lack of fertilizer nitrogen lack will cause these problems are the steam also redish color have you had problems with spider mites

I have closley inspected leaves and stems under a x4 bio scope for spider mites, molds ect.. but find none.
My curiosity is-" does a soiless medium take more nutes then a soil medium"?
I normaly -feed, water, flush, in about 14 days flowering, with soil, but find that the peat drains alot better then the soil did. It holds water pretty good but the soil held it much longer. It is taking roughly 32oz every other day with the peat.
The stems are redish?

[NMPatient]

They look a little pale, could need some nitrogen. The spots are hard to tell from the picture but look like a magnesium deficiency. What kind of water do you use, what is the ppm? I would try using cal-mag. There is also a little purple in the leaf stems, could be a lack of phosphorus. What flower nutes, and what soil are you using? Sometimes Foxfarms Ocean Forest runs hot and can cause some issues. I would also suggest flushing the plant out and testing the ph on the water that runs out. Starting with a soil ph of 5 is very low and could be a culprit, often leading to nutrient lockout ( should be about 6.5-7). Do you test the ph of the water that you use? What are the temps and humidity day and night?

Yellowing is common during the last weeks of flowering, the plants have used up there stored nitrogen and it shows usually on the lower leaves. This is not a problem and things continue to yellow during the last 2 weeks of flushing. It does not look like it, but spots can also appear from misting or spraying while the lights are on.

Overall they look fine. They made it to the flower stage and should make it through to the end. I would start with a flush and test the ph and ppm of water that comes out. This will give you a jumping off point in tackling the problem.

Best of luck, please let us know what happens.

[shmedy]

just a thought, might possibly be a calcium deficiency. the following is from "Marijuana Garden Saver, Handbook for healthy plants"

Calcium deficiency sometimes occurs in soil-less growing mediums that have not been supplemented with lime.
Distilled and reverse osmosis water, as well as some tap water, lack significant amounts of dissolved calcium.

One symptom the book lists is, Necrotic blotches of tan, dried tissue. Another is stunted plant growth and makes the leaves turn dark green. I noticed your leaves dont look dark green, but i also noticed what appeared to be necrotic blotches of tan. (Plus you mention the soil-less mix). Good Luck

[MadSativa]

I agree it is some kind of defficency, with the medium you are usesing, if no dolomite lime was added before you should add some to the top of the pot now, also if your soil has dolomite in it, then mabey try some cal/mag. the soil ph and wter ph should be at about 6.0.

test your run off from the pot and also test the water ph before feeding. they should be realy close 6.0, also since your plant is already sick, some enzyms to help the roots would be a good idea, hygrozyme, and sensizyme is available localy or cannzym is available for about9 bucks at BGH. ph being off can stop the plant from taking in nutrients so look at ph first, then look at adding suppliments, or you could make things way worse. thats a very nice bush buy the way, if your a new grower your doing great

[xsnoder]

Right on,:thumbsup:Thank you very much everyone. The domilite would make alot of since seeing how I never put any in the mix:asskick: Will start by flushing and testing the water tomorrow.
My water is tap but set in open containers for 3 to 4 days before use. The mix is 25% potting soil and 75% peat. I honestly have never tested my water only becuase I had not had any problems before, but I am going to start asap. If, the ph of the water is within norm, both in supply and drain, could I add some worm castings to the top of the mix? I didn't really think this thing through the way I should have (was forced into transplant due to root bound,bond?) but the mix seemed to be doing fine up until the flowering stage.
Awesome advice!
I will post some more pics of the progress, thanks for compliments on my girls MadSativa.

[ScaredasHell]

Peat or peat moss is way too acidic - rather than trying to counter that with lime, I'd suggest using coco or vermiculite. Peat is usually added to acidify the soil - and cannabis is one of a few plants (e.g. asparagus) that does better in a slightly alkaline mix.

Scared

[xsnoder]

Ok, had been feeding a normal shedule with the nuts but decieded to start feeding every other day and flush in between a day or so ago. I am on my way to go get some supplies to test the water and get some lime but wanted to drop a few photos before I split.
They look really good this morning and perky They eem to be ok with the feed /flush thing but agian it has only been in that new feed schedule for a couple of days.
When I get home I will post some pics of the nuts I have been using for all plants and my resaults with the water.
Thanks again everyone.

[xsnoder]

Peat or peat moss is way too acidic - rather than trying to counter that with lime, I'd suggest using coco or vermiculite. Peat is usually added to acidify the soil - and cannabis is one of a few plants (e.g. asparagus) that does better in a slightly alkaline mix.

Scared

I added the lime but am going to try the coco next time around, Hear good things about it.
This has been a great learning experience.