I have been cloning for a long time now and I’ve used dirty scissors/knives, scraped flesh off, left them alone, used clone gel, used nothing. I’ve never seen “pathogen” attacks. I’ve never had a plant suddenly “keel over”. That sounds like some crazy fuck up there, or chemical issues.
I have lost clones due to too much humidity after week 1 (not letting them breathe), and some of the times I used a water cloner like Doug has I lost them due to mushy stems (probably didn’t clean it enough). I went back to using good old root riot cubes, a tray, dome, heatmat and temp controller and I have no had any problems since.
Never had to figure out calluses or whatever is fashionable this year.
Been working with plants for nearly 20 yrs.
And I have been growing plants for 30+ years… more if I consider growing up working with grandpa on his farm or my 6th grade AP hydroponics science fair project. If you check my IG you will see that I ran a clone room where we maintained over 10K cannabis clones with 70(+) trays of 78 cuts incoming per day so I am not your average grower and I would be willing to bet I have attended to more clones and dealt with more cloning issues than most anyone else on this forum who has not worked in such a position. My first Masters thesis back in 1999, before I changed to an Engineering degree, was on the viability of tissue culture for cannabis so I see myself as having a little bit of experience and standing in the field. I see your claims of never having seen a pathogen attack but then you mention your damping off (…a pathogen attack) and mushy clones (…also a pathogen attack) which in my opinion invalidates your initial claim and casts doubt on your understanding of the germ theory of disease… but I still respect your postulation and uncertainty in my conclusions which are straight from scientific studies and which have solid and well-documented scientific bases. 
Well at least I am hoping it will be. So we have 11 BOG Blue Moon Rocks F1’s soaking. Figure no time like the present to get these going. Let’s see if these babies with germinate for me. We all know I have had the worst luck with this strain. So let’s bring this run back to life.
