I don’t have mildew so that’ll be difficult to fight what I don’t have.
What specific part, Joe? Where does a phylogenetic analysis fit into your spore-denial?
“the poisoner” ugh…kinda cringey.
I find it kind of funny this strawman “poisoner” is simultaneously spraying highly effective pesticides every week and yet somehow always has mildew? Almost like he doesn’t exist outside your cartoons.
When should I expect this “spore” floating through the air to land on my plants and sprout into mildew? It’s been over 20 years since the poisoner gave me mildew. I wiped it out in a weekend, yet he still has it. You think he is going to call me and ask how to get rid of it?
If you run proper conditions and don’t bring infected material in, it doesn’t happen. I assume you practice good spacing and airflow if you’ve been PM free for 20 years.
I only get it when I don’t…I’ve probably gotten it 4-5 times in total, and only one of those times was from an infected cutting. The rest was the result of overcrowding and thus insufficient airflow, leaves touching, etc.
Do spores just not exist? How does an outdoor plant get mildew when nothing around it is infected and you start from seed? How did the Marchantia liverwort start growing on pure rockwool when there is no Marchantia growing anywhere near me? Magic…or spores?
My recent experience with PM I believe was from an infected clone. But my conditions were favorable for it spreading.
Thing is I never gave too much thought to conditions as I never had PM in my 10 years of growing and thought this was an issue id never come across.
My grows are often crowded with plenty of leaf on leaf condensation and never got it. My guess was i had brought the temps to 60F and RH to 60% because I was drying. These 4 factors created the perfect storm. High RH, Low Temps, Infected Material and crowding.
Over the winter i did the same temp and RH dry technique and my grow was a bit more spaced out and never got PM. There was some leaf on leaf touching but nothing major.
ok I need the exact conditions to start a powdery mildew infestation. I need to bunch my plants together and not have a fan? What percent humidity should I attain? I know how to start a botrytis outbreak, but powdery mildew that would be novel.
I feel sad for you, when you say things like that.
You crush it’s head yet? 
That shit comes in on the wind. In the fall it is everywhere and if you give it the proper conditions to thrive it will.
Wildfire. Roses, lilacs, hell even my zucchini gets it.
Spore load depends on inocula source. There aren’t just spores for every microbe everywhere. Even when spores circumnavigate the globe, spore load density is significant in determining disease outbreak severity. Spore load is dependant on distance from the production source and the amount of host material that the mildew has available to grow on. Limiting alternate hosts in the area limits inocula. Or at least scoping alternate hosts to know how prevalent the relevant species of PM is, is helpful for planning IPM strategies.
Taxonomy matters because we used to think Cucurbits hosted the same species affecting Cannabis. Now we know they most likely aren’t the alternate host risk, Asters are.
They get different species. None of those are risks to Cannabis.
I’m not sure I’m following you.
Are you saying that PM is host specific and I can only get PM on my cannabis from other cannabis plants?
I agree some plants are more susceptible than others.
Yes Erysiphales (powdery mildew Order) are often highly host-species specific. Most only affect one, or a few closely related hosts. Generalist species are rare. The host range of this species is a bit weird, and may represent recent evolutionary host jumps (Canabaceae, Asteraceae).
Podosphera macularis may affect Cannabis, but its primary (prefered) host is Humulus (hops), and is unlikely to be the cause of severe disease outbreaks among Cannabis in normal situations.
It seems strange to me because my zucchini’s were right next to my cannabis and they were both infested.
It’s possible there are cannabis plants nearby or even hops maybe but I haven’t seen any. I don’t think there are nearby zucchini’s either. Impossible to be sure.
So I had 2 separate outbreaks in the same garden?
I have 3 separate outbreaks in the greenhouse at work. 3 different species of mildew. One on Oxalis (sorrel), one on Lactuca (lettuce) and one on Amaranth (pigweed). This is the Pacific Northwest, so the land of PM.
Have a scope with a camera?
Might wanna try planting garlic throughout your gardens and around weed crops.
It’s a known antifungal. Let other weeds like nettle and dandelion grow too, you can eat all of it. Diversity is key.
Spraying garlic water would probably help too. Crush a bunch of garlic and let is soak in water overnight.
It also functionaly breaks up canopy. Right next to an infected plant is where the highest spore load will be. If right next to that infected plant is a non-host species (or a resistant Cannabis cultivar), the high number of spores that land on that non-host plant are going to die.
This is an issue from last year so no specimen I’m afraid.
That’s very interesting stuff. I had no idea.
It is also a double edged swored. The American government nearly sent the American Barberry (Barberis canadensis) into extinction because it is an alternate host of wheat rust. They also stupidly sent infected barberry samples around the country to help people ID the fungus.
It is safe to assume there are some spores present all the time. But limiting immediately local alternate hosts (not drive them to extinction) can be helpful.
Perhaps channel that sadness into a cartoon?
Of course spore load matters. You’re more likely to get it in summer than winter, and far out to sea there may be no spores at all. The fact that cucurbits allegedly can’t host Cannabis mildew is interesting, sure. I’d have thought they were more generalist and it’s rare for cucurbits to not get at least a few spots here and there, but, whatever species can infest Cannabis seems more or less ubiquitous.
I live in the Midwestern US, the spores are everywhere. If there weren’t I’d never get it outside, or in. I treat all incoming plants with an effective fungicide so contamination isn’t the only vector.
I don’t “IPM” I treat problems as they occur, which is rarely.
Spores are everywhere, but you rarely have a problem? Cultural controls are IPM. You are doing it already.
And if spores are everywhere, why would you think you got it from an infected cutting?