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[Rootsruler]

That looks like a Potassium deficiency to me. Are you feeding it cal/mag and if so how much? High calcium in soil will lockout lots of nutrient ions like Potassium.

You mentioned potting mix. Can you provide a brand or what its makeup is? Perlite ratio?

[Bluey]

A couple of pics ref above with a healthy nice green girl on the left

[Bluey]

This symptom is not uncommon and I get it with my sativas but I don't get it with the other genetics I grow.

I think it is a combination of the LED lights and nute management. It tends to start with me around the 3rd week of flower in my girls but it's not something that appears to hold back the plant much at all.

I haven't resolved the problem and tried both reducing the light a fraction and mucking around with pH and calmg & PK suppliments.

Best advice I can give is raise the pH just above 6.2 with a calmg suppliment but don't continue with it past the 4th week of flower.

In my girls it starts in the top fan leaves exposed to the most light and then slowly spreads into the bud sugar leaves making them crispy. It doesn't appear to effect the lower fans getting a little bit less light.

Potting mix is a poor medium to use and often contains slow release N which can cause big problems in flower.

Here's a pic below of one I harvested last week with this issue but still got it to maturity and over a pound. Haven't jarred it yet but will know total weight in a day or two.

Edit. Temps on their own are not the issue, and probably not related to VPD either as last plant I kept temps low and VPD very conservative, yet it still came on regular as clockwork. Focus on pH, nutes and light. It can't be fixed now just manage it by reducing the speed of the spread.

[MDGrower]

Hello fellow growers and thanks in advance for any help. This is my third grow and I have two plants in my indoor grow area; one is a banana purple punch (doing quite well, thank you) and the other is of uncertain genetics but was called Fem Autogrow Hi-C on the card I was gifted. The latter is the problem girl.

My setup:
1 - 100 watt generic LED full spectrum
1 - 200 watt Spyder Farmer SF 2000

Plant growing in potting mix in a 5 gallon fabric bag

Germinated on June 9 and has been in flower for about 12 - 14 days

Temps range from 72 to 78*F and humidity between 41 and 57%

Using Dyna-Grow/SuperThrive Foliage (during veggie time) and now Bloom at 3/4 tsp per gallon. I pH the water to between 6.0 and 6.4

Noticed some yellowing on a few leaves with brown spots, about 8 or 9 days ago and now it is nearly affecting all levels of the plant. Today I found some really scary leaves (see pic) that had curling and dry/necrotic leaf tissue.

I have flushed with plain pH'd water twice in the past 3 days but the ugliness marches on. I can't tell if it's nute burn, light burn, cal-mag deficiency or what.

Thanks again,
Allen

[Bluey]

I've had this before but not to such an extent. I think it may be related to phosphorus issues. I'm pretty sure in my case it was not related to any pest issue. I had maybe a dozen of those circles on a dozen leaves at most and it went away with proper pH and nute management.

[Smallgrow]

Hi all
looking for some initial thoughts on this girl please.
She’s growing outside in living soil at a friends place.
I’m going to have a look this weekend and get some more details and pics.
This is all I have for now. It has been pretty wet and rainy here the last few weeks.
Any thought appreciated

[BU2B]

If growing out doors I use neem oil. However once plants start showing sex I switch to garlic and soap spray. 4-6 cloves (or two heaping teaspoons of powder). Let set over night strain and add to 1 Gallon of water with 2 or 3 drops of the mildest soap you can find. If won’t eliminate them but it will dramatically reduce their numbers (re eggs). Be sure and spray underside of leaves. Only needs repeated after a rain or every 5 days or so. I would also suggest you discontinue this topical spray once flowering is fully underway. 👍🏼

[Rootsruler]

https://generalhydroponics.com/products/azamax/

[Bluey]

You appear to have spider mites

I've never had them so read below for a good run down.

https://www.growweedeasy.com/cannabis-plant-problems/how-to-get-rid-of-spider-mites

[Rwise]

in veg I use spinosad, in flower if I must I use 1 part ISO with 8 parts water, both are contact killers spray the under side first then the top the soil everydamnthing. Do this every third day for at least 3 treatments.

[Beano86]

How do I get rid of the bugs first time growing

[Rootsruler]

Cal deficiency usually shows up as crispier edges. I'm going to say N def. Could also be related to pH issues as mentioned by Bluey

[Bluey]

It's a calmag deficiency most commonly caused by too low pH in the medium.

[static]

Hi all, I grow in soil (black Swallow) one of my plants has developed this problem but others are unaffected, just curious if you have any idea what's going on? I am losing the big fan leaves because of this now

Thanks kindly

[Bluey]

A few small changes can bring it on more or earlier or both, such as brighter lights or a change in the VPD.