I have an outdoor grow with multiple strains: GG#4, Forbidden Fruit, and Strawberry Banana.
Happy Frog Soil
Botanicare: Pure Blend Pro, Cal-Mag, Silica Blast
Microbe Life: Photosynthesis Plus
pH: 6.2 (I use a Bluelab Pen for accuracy)
Two weeks ago, I saw some yellowing leaves at the base of two of my plants.
The leaves seem to yellow from the base and then outwards.
The main veins in the leaves seem to blacken as well.
Eventually they die and fall off.
It also seems to be spreading to another plant close to them.
Since then I have stripped off all of the infected leaves and quarantined the plants.
I regularly spray Spinosad and Neem for pests and I also check the plants under a microscope for signs of small pests.
All seems clear. I even sprayed some SNS 244C Fungicide to see if that would clear it up.
The only identifying factor I can see are these brown/red spots that seem to appear on the stems of the leaves that will eventually die. It also seems to be spreading throughout the plants. (See pictures).
Has anyone seen anything like this?
It doesn’t seem to be pests.
It doesn;t seem to be a deficiency. (Flushed twice with perfect pH and feed them mildly).
The only thing I can think of is some disease I’ve never seen.
Any ideas would be much appreciated!!