Final update for anyone who has this issue in future (I've read a lot of threads with no answer). I sprayed the fungus spray last night, and the issue hasn't progressed :D
It was spreading very quickly over the past two days, but this morning I found no new spots or spreads. Thanks everyone...
I took a couple of leaves and photos to my local hydro store. The guy there checked out the cut leaves with a microscope and found no evidence of eggs or insects. He recommended double checking for any flies (I've found none), but said the leaves look a lot like a fungal infection. I bought some...
I thought I'd give a quick update over the past twelve hours, the condition is much more obvious now. One photo of each plant. As you can tell, the lower leaves are in much worst condition than the top.
Ok no worries - I've seen Kill-a-mite which is designed specifically for mites and thrips:
https://www.hydrocentre.com.au/kill-a-mite-100ml-concentrate-kills-spider-mites-a
I'll post an update next week as I have seen this issue raised many times with other growers, with almost no results.
Thanks again everyone,
I can confirm that I don't have any mites/bugs as I checked every leaf fully with a magnifying glass. No movement, and no insects. I must admit that I did see 3 - 4 small yellow flies around plants about a week ago, which I killed (and haven't returned).
The CalMag is...
Hey all, thanks alot for your replies:
I add calmag 1st, at 1ml per litre.
I have been using 2.3ml/l of both a and b, and also a tiny amount of seasol in my last two waters.
I water to run off each time, twice per day.
I don't spray onto leaves, although from time to time some splashes on...
Hey everyone,
I have a problem with my 3 week old autos.
I'm running Canna a + b, and calmag (starting at 250ppm, now 500ppm total), basically following manufacturers chart. PH is 5.8 - 6.0, 70% RH, 75f temps.
I've basically had this problem since seedlings - tiny yellow spots that continue...