How to handle the white powdery mildew ?

MICHI-CAN

Well-Known Member
Sorry. I purchase alot of my household chemicals raw in larger containers from A schol supply store. Amazing what kid`s have in science class. And cheaper prices If you can actualy uze It.
 

BigDaddyStrain

Active Member
Milk? If It kills things? I wouldn't drink It. Please further convey Your thoughts and reasoning. Curious. Apollogies OP.
''Scientists are not exactly sure how milk sprays work, but most think proteins in the milk interact with sun to create a brief antiseptic effect. Any fungi present are "burned" into oblivion, but there is no residual effect after that. In order to be effective, milk sprays must be used preventively, must be applied in bright light, and should be repeated every 10 days or so.''
 

hodgey420

Active Member
''Scientists are not exactly sure how milk sprays work, but most think proteins in the milk interact with sun to create a brief antiseptic effect. Any fungi present are "burned" into oblivion, but there is no residual effect after that. In order to be effective, milk sprays must be used preventively, must be applied in bright light, and should be repeated every 10 days or so.''
Ill wait till the next day its sunny and try out milk and water
 

hodgey420

Active Member
New bug activity on one of my plants had a ladybug stay on my plant for 2 days was gone this morning but nkw see bunch of tiny holes in little clusters on top leaves!
 

hodgey420

Active Member
@MICHI-CAN I got my pm back during flower can you use the H2O2 on buds during flower ive tried apple cider vinegar 2tsp and quart of water didnt seem to work and 3:1 ratio i tried on some leafs it works but that seems to strong of apple cider vinegar to spray on buds. We've had a wind and rain storm since Monday ends tomorrow so had to put all my plants under my patio and pm is spreading all my buds look so good don't want to lose or wreck them one bud on one my plants has a brown spot bud rot rest bud looks good im guessing I cut that spot out before spreads?
 

SupraSPL

Well-Known Member
H202, 1% milk, apple cider vinegar, neem oil, compost tea, baking soda, ultra low humidity etc will treat it/manage it but will not cure it. I tried different things for about a year before I gave up and shut the perpetual down, treated the most important clones with a systemic fungicide (Myclobutanil), sanitize your grow space thoroughly with hydrogen peroxide or even bleach and begin again. Since then, no powdery mildew for years now and I do run at 60-80% relative humidity.

Dont break your back trying to maintain 30% humidity, it will not cure anything just slow it down. Once you are cured, you can run up to 75% humidity with no problem. So high humidity doesnt cause it, but it can encourage it once the spores arrive (usually on contaminated clones). If you live in a place that has lots of cannabis grows nearby, the spores might arrive via intake air but I am not 100% sure about that.
 

MICHI-CAN

Well-Known Member
@MICHI-CAN I got my pm back during flower can you use the H2O2 on buds during flower ive tried apple cider vinegar 2tsp and quart of water didnt seem to work and 3:1 ratio i tried on some leafs it works but that seems to strong of apple cider vinegar to spray on buds. We've had a wind and rain storm since Monday ends tomorrow so had to put all my plants under my patio and pm is spreading all my buds look so good don't want to lose or wreck them one bud on one my plants has a brown spot bud rot rest bud looks good im guessing I cut that spot out before spreads?
I tried all the home remedies with no good results on large over crowded plants. Baking soda and milk stained my leaves. H2O2 oxidized this. Vinegar left no damage. But PM was back with a vengeance in a couple days. I ended up throwing a huge piece of plastic over my plants. Sprayed my entire tent "greenhouse" surface and all hardware with 70% alcohol. Removed plastic and waited 24 hours. Then applied a foliar of Regalia "CG" at 2oz/gal. 3 days later and I introduced into watering and food at the same rate. Effects were noticeable in few days. Repeat both every 7 days with foliar and feeding being 3 days in between eachother. Almost 2 weeks later and I am happy to say my PM appears to be almost completely gone.

@hodgey420
 

hodgey420

Active Member
H202, 1% milk, apple cider vinegar, neem oil, compost tea, baking soda, ultra low humidity etc will treat it/manage it but will not cure it. I tried different things for about a year before I gave up and shut the perpetual down, treated the most important clones with a systemic fungicide (Myclobutanil), sanitize your grow space thoroughly with hydrogen peroxide or even bleach and begin again. Since then, no powdery mildew for years now and I do run at 60-80% relative humidity.

Dont break your back trying to maintain 30% humidity, it will not cure anything just slow it down. Once you are cured, you can run up to 75% humidity with no problem. So high humidity doesnt cause it, but it can encourage it once the spores arrive (usually on contaminated clones). If you live in a place that has lots of cannabis grows nearby, the spores might arrive via intake air but I am not 100% sure about that.
I'm growing outdoors :(
 

hodgey420

Active Member
I tried all the home remedies with no good results on large over crowded plants. Baking soda and milk stained my leaves. H2O2 oxidized this. Vinegar left no damage. But PM was back with a vengeance in a couple days. I ended up throwing a huge piece of plastic over my plants. Sprayed my entire tent "greenhouse" surface and all hardware with 70% alcohol. Removed plastic and waited 24 hours. Then applied a foliar of Regalia "CG" at 2oz/gal. 3 days later and I introduced into watering and food at the same rate. Effects were noticeable in few days. Repeat both every 7 days with foliar and feeding being 3 days in between eachother. Almost 2 weeks later and I am happy to say my PM appears to be almost completely gone.

@hodgey420
Any tips for outdoors? I also just found bud rot on one p.ant on couple nugs do I cut the whole bud off or just cut few cm below the bud rot type thing ?
 

Trish420

Member
Do you know where to get Regalia? Ive tried to find neem oil but no luck yet and the weather in vancouver canada has been terrible cloudy and raining on and off for a week and getting more rain and clouds for another week so no sun here for awhile
Hey there!
I live in BC, Canada and ordered Neem oil from Amazon.ca It arrived in less than 5 days..
 

MICHI-CAN

Well-Known Member
Any tips for outdoors? I also just found bud rot on one p.ant on couple nugs do I cut the whole bud off or just cut few cm below the bud rot type thing ?
At this stage just airflow and luck. Sorry. Keep them separated if in pots. Away from walls and fences or other plants. They all block wind and hold if not produce moisture.

The bud rot I take the whole branch if under a foot. Or at least 6" below it if larger. Better safe. Contrary to opinion I like to rinse my plants down before I handle or trim with pm or rot. Spores don't float when wet. Do this in the morning on a sunny day with a breeze. Rinse the plant again afterwards. Shake to remove excess water. Wash your hands and tools with 70% alcohol. Discard clothing worn. Launder immediately. You are carrying spores. Tie trimmings in a plastic bag and dispose of in outside trash headed for landfill.

I almost had my butt handed to me this year. Milk would be only suggestion. 25% solution worked fairly well. Just rinse off after 24 hours. Dried to a nasty white stain on the leaves. Looks worse than the PM. Whole milk appears to work better. And fresh from the cow after skimming the cream off worked better. Still country creed at heart. LOL.
 
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