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Chemical Fungicide to prevent Powdery Mildew safe for me?

greenops

greenops

Member
I can' decide if i should use a chemical fungicide, not sure if its a risk to my health, but I have to prevent PM!

I've had couple successful grows until PM appeared during early flowering in my last grow. I tried to battle it with sulfur spray, chemical fungicide, milk, garlic spray, hydrogen peroxide spray.. in that order but not all at once of course. Maybe i just started a bit too late cuz nothing helped. The PM slowly spread across the scrog and in the end i had to trow it all away.

Now i just started a new batch, trying to make up the losses of my last grow, but i'm a bit scared that it will happen again. I'm thinking to use a chemical fungicide (contains Dithianon and Difenoconazole) that was recommended to me by a grow shop here. Apparently its safe to use for fruits up to 3 weeks before harvest. I would intend to use it once in veg and prolly one more time before the plants start to produce buds. However a guy from another grow shop told me he would never use that product for his grow. Not sure why. Even online i read some articles stressing the risks of using chemical fungicide on marijuana. Do harmful chemicals stay inside the plant and will that be inhaled or why is that?
 
greenops

greenops

Member
In regards to my last grow I'm not sure how it even started because i had about 3 good harvests in there already under the same conditions. If anything, the rH is rather low at 25-35%. Maybe it's because i let it veg too long, the scrog got too dense and prevented an effective air circulation?

So all this i had to throw away......


I replaced all equips to avoid bringing spores into my new grow. However i kept the tent and inline fan, but washed them with bleach to be safe.
 

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the gnome

the gnome

Active member
Veteran
after a good cleaning, bomb the room/tent with fungaflor.
its also used in greenhouses with plants but wouldn't use it in the gro room.


spray plants in veg with Volck oil going into bloom as a preventative
you can spray after 12/12 for a limited time.
you can use it after you have PM... Combining 2 tbsp. baking soda and 2 tbsp. Volck Oil with 1 gallon of water can effectively treat powdery mildew

plus volck oil kills spider mites, mealybugs, white flies, adelgids and lace bugs scale
plus its an ovacide
AND
as far as pesticides/fungicides go its on a very low order of toxicity
and its dirt cheap compared to other stuff, easily available at ace ,lowes oarage depot etc etc for $7 a bottle

ive mentioned this stuff for years,
I don't know why people haven't picked up on this stuff.
its old school and has been around since i can remember

the best things is to have good airflow to prevent it in the 1st place
constant air movement it PMs worst enemy
 
symbiote420

symbiote420

Member
Veteran
A big myth about PM I see spreading around these boards faster than the fungi itself is peeps saying it gets on your walls, equip, etc ....not true! PM needs plant tissue (ex., dead or living plant tissue) to grow and spread along with the right conditions .....get your enviro temps/humidity in check, more air circ and better plant spacing ...and remove any fallen, dead, or infected leaves from the grow! I've just done these things plus sprayed my ladies with 1/2 strength GreenCure @ 34 days, I've drenched the soil with Actinovate to help repair any damage/diseases in the root zone ...my issues are a side effect from a root aphid attack I was recently under.

PM is always around us it just needs the right conditions to cut up in the grow. I see alot of peeps encouraging the use of Eagle20 but I'd advise against using it! There's alot of safer organic alternatives that work but peeps have to use them properly!!
 
C

cannaera

Member
greencure you got to use every like two weeks, sure it temp works but it does not cure, and then it kills your pistils becoming dark brownish. chances are you are pulling outside air, and most likely not using good filtration and uv-c bulbs for air purification. Start at the source, your conditions might be perfect in the grow area, but if lets say you have perfect conditions outside that is breeding spores, you straight intake them into the room... filter and uv-c will 99% help you with molds, pests, and pm issues. but of course your grow area must be equally sanitary, a grow all falls in equal parts, the lighting, the air circulation, co2, clean air and h20, healthy clean gardening habits,ect.
 
C

cannaera

Member
and once your plant or cutting has had pm, it is always in the plant, and any bad right condition for breeding pm will bring it right out.
 
M

moodster

eagle 20 is real good if you are in veg one spray and no more pm
 
greenops

greenops

Member
cannaera said:
intaking fresh outside air?
Click to expand...

intaking fresh outside air?[/quote]

yes it is, the ducting that brings the air intake into the tent is connected to the window. to reduce the risk this time, i fixed a sheet of hepa filter around the ducting... but if spores are truly everywhere, i guess they will still find there way into the tent.

that's why i'm thinking about using something the surely prevents it from happening, but i don't want anything that's potentially harmful.
yes everyone says eagle 20 is the cure, but first, they don't ship it where i'm at, second, i'd still have doubts using it, the same way i have doubts using the chemical fungicide i mentioned.

I was hoping someone can tell me more about the risks involved in using chemical fungicides for prevention.


the gnome said:
spray plants in veg with Volck oil going into bloom as a preventative

the best things is to have good airflow to prevent it in the 1st place
constant air movement it PMs worst enemy
Click to expand...

Yea thanks i'll be def adding additional fans this time. However it appears that volck oil isn't available here. i never heard of it, made a quick search and couldnt find anything for my location.

cannaera said:
greencure you got to use every like two weeks, sure it temp works but it does not cure, and then it kills your pistils becoming dark brownish. chances are you are pulling outside air, and most likely not using good filtration and uv-c bulbs for air purification. Start at the source, your conditions might be perfect in the grow area, but if lets say you have perfect conditions outside that is breeding spores, you straight intake them into the room... filter and uv-c will 99% help you with molds, pests, and pm issues. but of course your grow area must be equally sanitary, a grow all falls in equal parts, the lighting, the air circulation, co2, clean air and h20, healthy clean gardening habits,ect.
Click to expand...

cannaera, i accidentally unliked your post, didn't mean to. tell me if u know how to reverse it. anyway, yea i'm filtering the intake ducting now and that uv-c bulb sounds interesting. never heard of it either but i'll look into it. thanks!
 
the gnome

the gnome

Active member
Veteran
symbiote420 said:
PM is always around us it just needs the right conditions to cut up in the grow. I see alot of peeps encouraging the use of Eagle20 but I'd advise against using it! There's alot of safer organic alternatives that work but peeps have to use them properly!!
Click to expand...


this is so true, we are immersed in spores and bacteria just waiting for the right conditions to fall in line and then they grow.
for 3 yrs i never filtered air
or treated it with uv-c (not that it isn't a good idea)
but when ever you open the door and walkin you are bringing in a cloud of spores in the air on on your clothes.
I grew fungi for 10yrs, get a plate of agar, open it for 3 seconds and seal it, see what grows out in a week.

keep the leaves from trimmings pick up and out of the room.
keep air movement 24/7 and not too hi Rh
this is what I do and i never had a prob with Pm.
last year the floor fan in the room went out 4wks into bloom,
I got complacent and i didn't think much of it,
it was winter which means lower Rh in my area and it felt fine in the room, i dicked around replacing the fan and in 7 days
Pm hit me in a certain part of the room.
I controlled it on the leaves with volck oil and greencure.
but that really taught my ass a lesson on PM.
 
stihgnobevoli

stihgnobevoli

Active member
Veteran
FYI key ingredient in most "anti fungals" is sulfur

http://www.usesof.net/uses-of-sulfur.html

you can just buy a bottle of it at your local drug store it should be in the same aisle they keep shit like band aids and epsom salts and shit like that. pretty sure it's much cheaper than some fancy product with a name on it which prolly only contains enough sulfur to do the job and the rest is bullshit and filler to make you feel good.

by the way it's a fine powder like baby powder...you dust your plants a little...any moisture which would be causing the fungus to grow and spread will activate the sulfur thus eradicating and preventing the fungus from growing.
 
MIway

MIway

Registered User
Veteran
greenops... volck is the brand owned by ortho, i believe. it is just horticultural/dormant oil, which can be had at any local nursery, of whichever brand. never used it as a fungicide myself, but one of the best & cheapest insecticides out there, just have to use caution to not oil burn your plants. i wouldnt grab it for pm though.
 
habeeb

habeeb

follow your heart
ICMag Donor
Veteran
"PM is always around us it just needs the right conditions to cut up in the grow"


so true....

people don't understand it's all the conditions that spring these things into action.. it's the consequence or symptom of what your doing..


that said, I would also suggest you find healthy plants, as genetics play a role in the susceptibility of resilience to outbreaks..


Chimera once said, and I haven't looked into, that PM takes hold in the root zone first, then the spores are the "flowering" part, and what spreads the condition..

I also believe there was some talk earlier back with the role of Ca in relation to PM...
 
symbiote420

symbiote420

Member
Veteran
Eagle20 takes 45 days to get out of the plant ...if you must use it please don't use it after the 1st week of flower! I've heard using it breeds resistant mold strains. Another myth too ...and I love ol' Chim lol but PM does not live inside of the plant's tissues .....it attaches itself to and roots into the leaves to extract nutrients from the host plant(s). A plant with rootzone pathogens is more susceptible to PM and other diseases/pest because it's not healthy!

Air movement is the most important factor to preventing it. And once a plant has PM it's not doomed .....another myth, it needs to get back healthy and the PM is gone!
 
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