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Oidium infestations in marijuana are relatively common in indoor and outdoor cultivation.
Powdery mildew spores are present in nature, dispersed, and under favorable temperature and humidity conditions, they spread to plants.
Known as white or whitish mold, its spores adhere to stems and leaves, infesting plants in a few days.
Above all, it appears when the plants enter the flowering phase , as it is when they weaken due to the high need for nutrients.
This fungal infection will reduce the productive capacity of your plants by 80-90%, ruining your harvest.
Once installed in your plants, it will feed on them, absorbing their sap, and colonizing them entirely, until they are killed.
Its spores can spread to any part of the plant, even within its buds, where it is difficult to eradicate it.
If your plants are infected with powdery mildew just before harvest, it will not affect their production so negatively , but you will collect buds full of dust, or harmful spores.
Unless you treat your plants with specific products against powdery mildew, and even then you may not eliminate it completely.
There are UV lamps, which just passing them for a moment over the plants, eliminate powdery mildew in a fulminant way.
This new method ensures a complete destruction of the powdery mildew from your plants, and without using polluting products.
Despite not being advisable to smoke or consume powdery mildew plants, it does not usually cause major problems.
Unless we are infested with pink powdery mildew, this type of powdery mildew can transmit serious lung infections.
So we recommend destroying the affected plants of Oidio Rosa, to avoid unnecessary risks.
But how to remove powdery mildew from the buds?
If during growth or until mid-flowering our plants are invaded by the aforementioned fungus, we can act in different ways.
Treating them with chemical phytosanitary products (within the recommended safety period), or with ecological phytosanitary products, with greater tolerance.
Also change the pH of the plants, by spraying water and Sodium Bicarbonate, or better Potassium, with a maximum pH of 8.00-8.5.
Also use PH-UP dissolved in water, with the same method of raising the pH of the water with pH-UP to 8.5 and spraying.
To measure the pH we will need a more economical digital or drop pH meter.
Increasing the pH of the water will slow its progress, inviting the fungus to spread to other plants, by altering the pH of the sprayed water.
Or spraying decoctions of horsetail, or Propolix anti-powdery mildew , will eliminate it almost completely.
If you still plant yourself at harvest time, and the spots appear on the leaves, there is little you can do.
Except to cut the buds, having previously washed the plants with a spray, and even so, the spores will not be totally eliminated.
Well, between the conglomerate of marijuana flowers, and their resins, the spores adhere , and even if you remove the leaves, the buds will remain.
How to remove powdery mildew spore dust?
With a tank, container or basin full of water, that is of a size that allows submerging the branches cut with buds.
To the water, we must add 3% of its volume, Oxygenated Water from a pharmacy, or better for food use.
This is for each liter of water, 30 ml of hydrogen peroxide , hydrogen peroxide is not toxic, and clean due to its oxygen content.
We will introduce a few moments, the branches with buds into the water, when we remove them we will be able to see the layer of spores floating on the surface of the water.
We must change the mixture of water + hydrogen peroxide as many times as necessary , as it fills with dust, and is no longer effective.
When removing the branches with buds, we will immediately put them to dry, hung and if possible with a fan that will accelerate their drying.
In just a while, the water adhering to it after its immersion will have dried, and we can dry them calmly without risk of rotting.
This is the best way to eliminate powdery mildew from already cut buds, and in plants about to be harvested, when there is no time left for treatments.
We hope that this post helps you obtain healthier crops, and free them from the annoying Powdery mildew.