Trouble reading today's article? Click here: Issue #164 - Sunday, June 7, 2015 Dear Fellow
Grower, In today's issue... - You'll learn how to completely decimate White Powdery Mildew and banish it from
your grow area!
- Arm yourself with the right tools to protect your future buds from this repulsive scourge!
- A reader sent us a link to what could be considered a 'historic trophy pic'. Check out a full-lot guerrilla grow in 1951 New York!
Nebula Haze & Sirius Fourside (founders of GrowWeedEasy.com)
"The greatest of follies is to sacrifice health for any other kind of happiness."
~Arthur Schopenhauer
White Powdery Mildew by Sirius Fourside |
White. Powdery. Mildew.
Also known as White Powdery Mold.
It can range from a minor annoyance that is easily resolved to a relative catastrophe that ruins an entire harvest.
Never experienced it?
Imagine circular patches of a living, breathing, fuzzy, flour-looking substance showing up on your plant's leaves without any warning. From there, the mildew can easily spread to other leaves and buds, rendering the buds unusable.
White Powdery Mildew has such an easy time spreading that even careful growers who take proper precautions can still experience it. |
For example, the picture to the right is what I found on one of the leaves of MY plants not too long ago!
Luckily, the issue was easily resolved because it was caught early, and because White Powdery Mildew is completely reversible up to a point.
This week, we will arm you with the information to stop this fungus' proliferation before it even has a chance to take hold!
What Is White Powdery
Mildew? White Powdery Mildew is a rapidly reproducing (both sexually AND asexually) fungus who only knows how to do two things:
1. Eat your plants
2. Make more White Powdery Mildew
Fortunately, White Powdery
Mildew is easy to spot since the white patches of fungal growth it creates stand out against cannabis' green leaves.
It can be removed from plants with proper treatment if spotted early on, but any buds with WPM should be processed (such as with Dry Ice) or discarded as they most likely contain many more spores than your eye can see.
What causes White Powdery Mildew?
High Humidity
- WPM needs moisture to thrive, but that doesn't necessarily mean it needs water. Having a grow area with high humidity is all WPM needs to grow. This seems to be a bit problematic since young cannabis plants grow best in relatively humid environments (40% -70% rh). Luckily, high humidity usually only
becomes an issue when it's combined with the next cause (low/no airflow).
- People who live in environments with extremely high humidity (such as Florida and the UK) can purchase a dehumidifier to control humidity in the grow area. This is especially important during the flowering phase when humidity needs to be
much lower (45% rh) to prevent rampant growth of WPM and bud mold.
Low/No Airflow
- White Powdery Mildew has a hard time settling in a grow room where the air is being moved. High humidity will give WPM the
conditions it needs to survive, but poor airflow is what gives it the ability to settle down in the first place. In fact, a small (preferably oscillating) fan moving air in a grow area will prevent the vast majority of White Powdery Mildew woes.
Poor
Ventilation
- If you have WPM spores in your grow area and the air in grow area is never exchanged for fresh air, the spores get multiple chances to land on your plants and reproduce. This happens most often in conditions where cannabis is being grown in a closed, unventilated space - such as a closet -
and precautions aren't taken to exchange old stale air for new fresh air.
Leaf-Leaf Contact
- Leaves that are touching each other will form moisture
between them, and thus they become more likely to attract WPM. Untrained bushy/leafy plants with lots of new vegetative growth are especially prone since plants will often have leaves mashed up against each other as they try to reach the light.
- Advanced growers can defoliate some of the fan leaves that are completely shaded from the grow light to make fewer choice landing
spots for White Powdery Mildew. Also, defoliation frees up energy for the plant to use when done correctly and increases yields! See our article on defoliation for more info.
How to Eliminate White Powdery
Mildew
As I mentioned earlier, I recently had a battle with White Powdery Mildew. Rather, it might have been a battle if I noticed it later or waited to fix the problem. That's the one good thing about WPM: in most cases when WPM is caught early, you can remove all traces of the mildew without harming your plants.
There are quite a few products and homemade concoctions people use to treat WPM. Among the effective treatments are:
- Milk (1:9 ratio of milk to water)
- Baking soda (2 tablespoons per gallon of water)
- Neem Oil (4 teaspoons per gallon of water)
- Hydrogen Peroxide (1 teaspoon per gallon of 35% H202)
- Store bought fungicides (warning: not all of these are safe for your plants)
Rather than go into these methods, I'm going to give you the simple strategy I use that gets rid of White Powdery Mildew on the first try, every time! Here's our trusted 3-Step White Powdery Mold cure: 1. Remove White Powdery Mildew from leaves - Get some water (preferably pH'd to about 6.0) and some paper towels. Wet the paper towels and use them to gently wipe the mildew off the affected
leaves whilst being careful not to jostle any leaves with spores on them. Using a wet cloth will ensure that more spores stick to the cloth instead of becoming airborne. Note: While it isn't necessary to use paper towels, their being disposable helps to curb the spread of spores from one leaf to another.
2. Ensure plants have proper airflow and ventilation
- Even if you have absolutely no airflow or ventilation in your grow room, having even two fans will drastically reduce your chances of encountering WPM while also benefiting your plants overall health. One fan should be oscillating if possible and should gently blow air over your plants. All the plants need is enough air to gently rustle their leaves. The second fan should be in your grow room pointing outward, pulling heat away from your plants (only needed if you have no
ventilation). Having a fan pointing out of your grow room will force old air out of the room, and in turn, pull new air into the room. At this point, you'll have new air coming in, being used and circulated, then kicked out. Keep in mind that two fans is a minimum. 3. Treat plant with SM90 to kill spores prevent future growth - Mix 1 part SM90 to 5 parts water(I've found even 8 parts water to be equally effective) in a
clean sprayer/mister . Wait until just before your lights for off for the day and mist your (newly cleaned) plants. Get all the leaves! This diluted SM90 mixed will kill any spores it touches, and anywhere it lands becomes uninhabitable for future spores. Plus, it's safe to use - even during flowering - and it smells
awesome.
There you have it. If you end up running into White Powdery Mildew, give this advice a shot and you won't have to deal with it past that first day. If you do end up using these steps, feel free to let us know if it helped you or not, or how you did it differently. When growers know just a little bit about this disease, it doesn't
have a chance!
Get Medieval On White Powdery Mildew! |
What's the easiest way to fight against White Powdery Mildew?
Have it completely outgunned!
Get the right stuff to let White Powdery Mildew know that your grow room is off limits! |
SM90
SM90 kills WPM, is safe for buds, and it smells GREAT!
1 Litre Mister/Sprayer
A mister is awesome for applying SM90. Also, it's
the best way to foliar feed your plants!
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"I thought about you two, So we bought this clone, get home to plant it and it has the claw on only one leaf, and scary green. No more nutes for you, and we start flushing. All of us could not grow without you two, a big heart felt thanks."
~ Tom Marvin |
Trophy Pictures of...1951? |
Original Description: "Journal-American reporter Sid Livingston and NYC officials view an Astoria vacant lot overrun with marijuana plants that have been scheduled for spraying with insecticide"
The original picture is above, and
for your amusement we've included a (hastily) colored version below.
|
Many thanks to reader Ed T. for sending us a link to this awesome picture! We encourage you to forward this email to a friend in need!
Who Runs This
Newsletter? |
Nebula Haze:
Medical cannabis is important to me personally, and I'm dedicated to showing others how easy it is to grow their own supply of
cannabis at home.
It is my mission to educate and build growing resources to help both new and advanced growers get bigger, better yields with less time and money. |
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Learn which seed sources are personally recommended by Nebula Haze |
Sirius Fourside:
Sirius Fourside is a hobbyist grower who has gained the bulk of his experience growing in water as a medium(deep water culture,
bubbleponics).
"Growing cannabis is a relaxing hobby in and of itself, but it also saves you money and keeps you from having to deal with shady characters. Cannabis is much
easier to grow than people give it credit for, and growing in water doesn't increase the difficulty much, if any. But whether you want to grow in water, coco, or a different medium, we'll show you how easy it can be!"
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accept and where they ship in the world!
View complete list of trusted seed sources:
http://www.growweedeasy.com/seeds
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