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- #81
cbdhemp808
Well-Known Member
I wrote, Jan. 1...
The potassium citrate I ordered arrived a couple days ago, and I made up a solution and sprayed my 5 plants in the flower house, for preventing mold. I used 4 tsp of the powder in 1/2 gal water, and 38 drops of Bronner's soap.
Checking today, things didn't go so well. I had to defol a lot of leaves that both had dark mold spots on the underside, and necrosis on the top. I couldn't tell... the mold was possibly dead, but I also got the impression the leaves were maybe burned by the K-citrate. Also, a lot of leaves had a dusting of dry K-citrate, which alarmed me for a minute, because I thought it was more PM. But I put it under the scope and it was just particles of the K-citrate. That was kinda weird, because I definitely dissolved the powder in the water.
Maybe I used too much K-citrate, and maybe the soap wasn't a great idea to add. Anyway, I blasted the plants today with my usual peroxide solution. There's a lot more sun reaching the greenhouse now, and the surrounding vegetation has been cut back to give more air flow. Hoping for the best.
Update:I tried the ascorbic acid foliar spray as per Shed's recipe for citric acid... seems like it didn't work. I should have tested the pH of the spray, but it may be around 2... very acidic.
I read that potassium bicarbonate foliar spray will kill PM (pH 8.0). Has anyone tried K-citrate (pH 7.0-7.5)? I read K-citrate is also great for foliar feeding of potassium during flower.
So, the citric acid is acidic, and the K bicarbonate and citrate are alkaline. It seems that alkaline is what's recommended to kill PM.
The potassium citrate I ordered arrived a couple days ago, and I made up a solution and sprayed my 5 plants in the flower house, for preventing mold. I used 4 tsp of the powder in 1/2 gal water, and 38 drops of Bronner's soap.
Checking today, things didn't go so well. I had to defol a lot of leaves that both had dark mold spots on the underside, and necrosis on the top. I couldn't tell... the mold was possibly dead, but I also got the impression the leaves were maybe burned by the K-citrate. Also, a lot of leaves had a dusting of dry K-citrate, which alarmed me for a minute, because I thought it was more PM. But I put it under the scope and it was just particles of the K-citrate. That was kinda weird, because I definitely dissolved the powder in the water.
Maybe I used too much K-citrate, and maybe the soap wasn't a great idea to add. Anyway, I blasted the plants today with my usual peroxide solution. There's a lot more sun reaching the greenhouse now, and the surrounding vegetation has been cut back to give more air flow. Hoping for the best.