Powdery mildew versus calcium deficiency

[johnehazeharvester]

Anyone know this. Some tan spots on the leaves in one grow room seems to involve all plants. I am thinking it may be powdery mildew but it's slightly tan. I do see it under the leaves as well. Fairly mild. Does this look like powdery mildew to you?

 

[Sueet]

No. PM kind of looks like ..... a dim, flat patch that will grow larger with time. (usually starts in multiple spots and grows together)
eta: I meant flat like, flat paint, all shine is gone off of the spot, not flat like surface.

 

[Phytoplankton]

Doesn't really look like PM, take a good look under the spotting leaves with a loop and check for critters.

 

[KeithLemon]

I know this. Some tan spots on the leaves in one grow room seems to involve all plants. I am thinking it may be powdery mildew but it's slightly tan. I do see it under the leaves as well. Fairly mild. Does this look like powdery mildew to you?

Does not look like PM to me. I had it last year and it did not look like this.

 

[cbdhemp808]

Probably nothing to worry about here – yet, anyway.

I do see some irregular leaf margins. Leaves are looking kinda dry and brittle. Can you show us a photo of the whole plant? i.e. big plant(s), not the little ones.

 

[johnehazeharvester]

Probably nothing to worry about here – yet, anyway.

I do see some irregular leaf margins. Leaves are looking kinda dry and brittle. Can you show us a photo of the whole plant? i.e. big plant(s), not the little ones.

Big plant head a bit of curl from heat or light stress. I was fairly comfortable. It was not mold and it is now in my flower room and doing okay soon to flower. One of the ceilings is not doing as good as the others. There is also now some necrosis at older leaf margins. I did use used soil reimmended mixed with some fresh soil. Not sure. Maybe the soil was a bit hot for it. In early seedling moisture was fairly high. Now relative humidity is on the low side near 40%

 

[cbdhemp808]

Color is very deep green... yes, perhaps too much N.

One of the [seedlings] is not doing as good as the others.

Maybe this is a case where you keep the strong phenos and let the one go... but see if it improves over time.

 

[johnehazeharvester]

Color is very deep green... yes, perhaps too much N.


Maybe this is a case where you keep the strong phenos and let the one go... but see if it improves over time.

Thanks! I am planning on transplanting outdoors at some point, maybe in 2 to 3 weeks. This will be my first outdoor grow so if they stay alive I'll still let them grow

 

[johnehazeharvester]

Probably nothing to worry about here – yet, anyway.

I do see some irregular leaf margins. Leaves are looking kinda dry and brittle. Can you show us a photo of the whole plant? i.e. big plant(s), not the little ones.

This is worst effected fan leaf of the big clone. Top growth seems ok
Maybe phosphorus deficiency?

 

[cbdhemp808]

Please show me a picture of the whole plant.

 

[johnehazeharvester]

Please show me a picture of the whole plant.

This was right after watering yesterday. Leaves got a bit droopy probably from too much water. They should be praying again by the time I get home

 

[cbdhemp808]

This was right after watering yesterday. Leaves got a bit droopy probably from too much water. They should be praying again by the time I get home

What kind of soil is this plant growing in, and are you feeding her? If so, what are you feeding and how often? Are you following a wet/dry watering cycle?

If you follow the wet/dry watering cycle, then when you water, the plant should immediately perk up. There shouldn't be any droop. Note that at night, it's normal for plants to show some droop.

 

[johnehazeharvester]

What kind of soil is this plant growing in, and are you feeding her? If so, what are you feeding and how often? Are you following a wet/dry watering cycle?

If you follow the wet/dry watering cycle, then when you water, the plant should immediately perk up. There shouldn't be any droop. Note that at night, it's normal for plants to show some droop.

I use a water gauge and wait till it is just getting into the dry zone. I don't let it dry out too much and try not to let it dry out until it droops. This is reamended used soil mixed with a slow release soil viagro.
Soil mix
In 28 gallon tote
About 20 gallons used
Used soil mixed w Vigoro
○ 2 gallons perlite
○
Evenly mix in the following amendments:
• Kelp meal, ½ cup per cubic foot of soil*
• Neem meal, ½ cup per cubic foot of soil
• Crab or Crustacean Meal, ½ cup per cubic foot of soil
• Gypsum, 1 cup per cubic foot of soil
• 4 cups of worm castings
• 1/2 cup chicken manure-+
• 4w lll
• 1/4 cup humus
• 1tbsp azomite
• 1 cup espoma plant tone

I put about one cc of Fox farm. Grow big and now a half a cc of big bloom in a half gallon container and only water. Maybe 50 to 100 cc's every couple days

 

[cbdhemp808]

Thanks for the info... I'll need to mull that over a bit.

A few more questions... what size pot is that in? Looks like 3 gallon. Also, are the other big plants doing well, and are they in the same soil? I take it these are all grown from seed? And are they the same strain, or different strains?

 

[johnehazeharvester]

Thanks for the info... I'll need to mull that over a bit.

A few more questions... what size pot is that in? Looks like 3 gallon. Also, are the other big plants doing well, and are they in the same soil? I take it these are all grown from seed? And are they the same strain, or different strains?

My other plants are doing phenomenal. I did a mostly organic run with the other plants using Dr. Earth products and my own additives like kelp meal, neem seed, alfalfa meal and crab meal, EWC and a variety of fermented plant and fruit juice and jadam microbial solution.

The plant having problems is using a different soil and it is only in a 1 gallon pot. I moved it from my vegetative room where it had some light and heat stress, hence the curling of the upper leaves.

My plans are to flower this clone and use this plant only for seeds after pollination. It is a clone of either my Rosetta Stone or mota Hara.

Things were hectic during the cloning because I was away for the week prior and there was significant potassium deficiencies and the person watering let them dry out way too much. I thought I was going to lose my OG Kush. It looks like it stunted, although this is more indica dominant plant so maybe that's the way it's supposed to look. But either way, the buds have developed nicely after correcting the problems.

Plants looked in rough shape after my vac ation but I still took four clones two from mota hara and 2 from Rosetta Stone. I didn't label them. One died and I gave two away. This is the only one I kept. Below are the other plants in the room