The problem presents as small light brown dots all over the leaf affected, then gets darker brown and then begins to yellow and eventually falls off or I take it off. I am worried that this is some sort of Disease with a bit of nutrient burn to go with it. However I have not been giving it Nutrients since I have noticed the problem. Okay, hear is some info: -12 days into flower & about 9 weeks old. -Canopy @ 24c -room @ 22c -Water about every 3 days -Have not fed since noticing the issue 10 days ago. (flushing with ph'd water) -Soil is a Mix of 50% CoCo and 50% Ocean Forest Fox Farm -Ph Going in is 6.8 and Run off is 5.8-6.0 depends on each plant. (run off 10 days ago was 5.4+/-) -1 plant out of 5 is being affected the most but the others are starting to show signs. -Problem starts from old growth and moves up like a deficiency. -Tips are burnt and looks like nute burn. -Nutrients I used was 1/2 strength Fox Farm Dirty dozen feeding schedule following Smart naturals My Water is Well water that naturally is around 8.0ph give or take. Its hard water and only sand filtered, Limestone Bedrock so it has Calcium, Iron and Sulfur naturally. The day I switched to flower I had a heat issue all day, room temp stayed around 32c for about 36 hours until I corrected conditions as to what I have them at now. (I originally thought this was a heat issue mabey, or stress?) The plant is growing good with new growth and does not look stunted, but whatever it is, its catching up. Here are some pics I could use some suggestions. Flushing doesn't seem to be helping, and the ph difference is kind of weird.
Doesn't look like nute burn. At least not to me. I could be wrong, but it looks more like a possible phosphorus deficiency.
Okay so after I looked at phosphorus def, I decided to go ahead a supplement them with Fox Farm Tiger Bloom 1/2 strength and 1/2 strength Fox Farm Open Sesame. I did 4 gallons total spread over 5 plants in 7 gallon pots. Tiger Bloom 2-8-4 Open sesame 5-45-19 Now we wait. Hopefully things will turn around and the issue will stop. Ill update soon.
It could be a ph thing. I dunno shit about feeding soil so i can't comment on yours. But coco needs around 5.7 to 5.9.... the large swing down in your ph seems alarming. Ph should go up as the plants take in nutrients. And only a little. But again my knowledge is of coco only and your soil mixed in may require something completely different than what im saying. The fact that your run off is similar to optimum coco runoff has me wondering if you slowly lowered your ph feed to 5.8 will a lockout from ph problem be solved. Phosphorus is locked out after 6 in soiless. I have no idea about soil. But mixing the two might change things.