Not sure what it is, longtime grower. Hard water or virus?

[mr autoflow]

Hi guys, I got some fem plants that shows yellowing from bottom to top that end up killing the plant. Looks like nutrient blocked, but the first time that I saw this ( not sure if the same) was when clones expended too much time in the dome with high humidity, some clones turned yellow and die months later in vegetation.

Thing is, this plants are from seed, and with new medium (earth,dirt) So I dont know whats happening.
They seem to get better when transported from indoor to outdoor. Indoor I have fluorescent lights and hps. I have mild red spider but never been a problem Ive seen plants die from mites but they dont look like that, have use neem, soap, etc

So I dont know if its fungus, virus, or hard water.
thanks

 

[Koondense]

Increase airflow, use perlite in soil. They look like they need more air to the roots(and overall).

Cheers

 

[mr autoflow]

For the record, the little dark green plant is a cookies (classic look, dark green with indica like leaves) that was yellow and affected by the same but recovered after moving it to outdoor sunlight.

Can it be something related to UV rays?

 

[Creeperpark]

You are over-watering your cups. Let the soil dry between waterings and when you water don't saturate. Use a turkey baster to water your cups to keep from overwatering them.

 

[mr autoflow]

You are over-watering your cups. Let the soil dry between waterings and when you water don't saturate. Use a turkey baster to water your cups to keep from overwatering them.

Thanks for the advice but no, I just watered before the picture and after a dried soil. Its not first time using those red cups, but its first time with that yellowing.

 

[f-e]

Increase airflow, use perlite in soil. They look like they need more air to the roots(and overall).

Cheers

I can only echo this. Airflow outdoors is unstoppable. What's in like indoors, and how is your RH.
They look like they were grown in a cellar. If all you do is carry them outside to make them better, it's pretty much the atmosphere.

 

[mr autoflow]

I can only echo this. Airflow outdoors is unstoppable. What's in like indoors, and how is your RH.
They look like they were grown in a cellar. If all you do is carry them outside to make them better, it's pretty much the atmosphere.

Thanks, Ill upgrade the airflow, and its a dry climate, very low humidity.

 

[Creeperpark]

I'm not saying you don't know what you are doing. You are saturating when you water and washing out the nutrients in the cups. You only need 30 ml of water per cup every 3 to five days. Your mix may be holding on to too much water and if you add more perlite, it may help. I try not to let any water discharge out of the bottom by giving minimum amounts of water. The small tender roots like it on the dryer side because of more oxygen exposure. When you limit oxygen to the plants roots, it does what your plants are doing now.

 

[Roadblock]

Thanks, Ill upgrade the airflow, and its a dry climate, very low humidity.

Get hold of an evaporative cooler, I have around 12 - 25% humidity during the day and the Cooler brings it up to 50-60% this is lights out time, at night when lights come on the humidity is about 50% in the rooms without the cooler running water just the fan.

I use Rockwool cubes and when cloning have always just dipped the bottom 1/4 inch into fluid when I felt it was too light, I did the same with cups and coco would just dip the bottoms in fluid and go by how the weight felt.

 

[mr autoflow]

I think Ive seen overwatered plants before but still I have enough plants to experiment with one, lowering the water intake, thanks.

And Ill take aim on the humidity.

Its just that Ive been growing a lot of strains in more than 7 years in the same conditions without this problems, thats why I didnt thought it was the setup.

 

[f-e]

Weighing them shows you how much water they use each day. Every gram is 1ml. I have scales just for watering.

Compost comes dry. It might look and feel moist, but we call it dry. If should never get any lighter than how you buy it.
My 5" pots weigh 300g with compost in. They run-off about 475g. My plants just reached the point where taking them to 450g each day, is leaving some at 300g the next day. I must pot up. They are drinking the 150ml the pot can hold. Last week I was just watering to 400g and they were dropping to 320g in a day. I'm constantly watching the weights, adding enough water to last 1 day. Until I can't so must pot up.

You should take a cup and fill if from your bag. Then weigh it.
Then weigh one with a failing plant in it.
The difference in weight, is how many ml of water it has.
The next day, weigh again. Then you know how much the unhealthy plant is actually drinking/needing.
Then you will know how over watered they are.

I presume, like others, it's low RH as it's warm there. However, is it actually cold? The plant looks cold and wet.

 

[mr autoflow]

Not cold, were in spring, but its been colder and havent got problems. I use the same setup for years and its only a couple months ago that I got this yellowing problem.

 

[dramamine]

To have this suddenly happen after years of the same routine, it seems like it must be a pathogen. If you're able, you could send a sample off to a lab and have them test it. At least you could rule it out if they find nothing.

 

[f-e]

Using bags of soil brings a lack of consistency. We can't control what they sell us. We just hope it's the same. While they are messing around with it all the time.

 

[mr autoflow]

Thanks guys. At the moment Im increasing airflow, rh, using an antifungus, new soil each time. The thing that putting them outdoors helps them is weird, but only in early stages, when the necrosis/clorosis is too advanced they dont recover outdoors.