How to kill powdery mildew? - Growing in Greenhouses - International Cannagraphic Magazine Forums

Tall Grower · 02-02-2016, 10:10 AM

Hi,

I am a newbie on this forum.
Since a short time I am growing some veggies in a greenhouse.
A few days ago I found some white stuff on the crops. After using google I find out that it's called powdery mildew.

Does anyone know how I can fight against powdery mildew?

Thanks in advance!

Robrites · 02-02-2016, 10:30 AM

Actinovate works good for me.

A one-stop fungus fighter for gardens, lawns & hydroponics! Actinovate works from root to leaf with a concentrated beneficial microorganism (Streptomyces lydicus) that establishes itself on plants’ roots and leaves. This water-soluble organic fungicide knocks back diseases that attack your lawn, ornamentals and even edibles yet is proven to be safe around pets, people and the environment. OMRI Listed for use in organic production.

Aksala · 02-02-2016, 10:47 AM

Quote:

Originally Posted by Robrites

Actinovate works good for me.

A one-stop fungus fighter for gardens, lawns & hydroponics! Actinovate works from root to leaf with a concentrated beneficial microorganism (Streptomyces lydicus) that establishes itself on plants’ roots and leaves. This water-soluble organic fungicide knocks back diseases that attack your lawn, ornamentals and even edibles yet is proven to be safe around pets, people and the environment. OMRI Listed for use in organic production.

Actinovate is by far the best non chemical imo.

Tall Grower · 02-02-2016, 11:26 AM

Thanks for your answers so far. How often do you have to use Actinovate till the mildew is gone?

Robrites · 02-02-2016, 11:46 AM

It works best if you use it before you have a big problem.

It works in the soil and if you spray it on your plants. I usually spray twice - 1 week apart. If it rains, you might want to spray it more.

Tall Grower · 02-02-2016, 11:58 AM

Thanks for your info.

Donald Mallard · 02-02-2016, 12:08 PM

Quote:

Originally Posted by Tall Grower

Hi,

I am a newbie on this forum.
Since a short time I am growing some veggies in a greenhouse.
A few days ago I found some white stuff on the crops. After using google I find out that it's called powdery mildew.

Does anyone know how I can fight against powdery mildew?

Thanks in advance!

you need to incorporate preventative measures also ,,
find out why you have the problem and treat it ,,

restricted airflow etc ,, the problem will continue unless you remedy ..

justanotherbozo · 02-02-2016, 12:11 PM

...milk worked for me. ...here's some info that may help you decide whether or not to try it yourself.

peace, bozo

-----------------------------------------------------------------------------

Milk is a useful fungicide in the garden, and is more effective than standard chemical brands.

Researchers believe the potassium phosphate in milk boosts a plant's immune system to fight the fungi.

Where most organic gardeners use a baking soda, soap and oil solution, milk may be substituted to combat the unwanted fungus.

Preparing a Milk Solution and Spraying Schedule

The correct dilution and spraying schedule for garden plants depends on the situation and takes some trial and error.

A milk fungicide solution can range from 1 part milk to 9 parts water, to a strong, milk-only solution. A 1:1 dilution may work for a week, but a 1:8 solution requires spraying every 3 or 4 days.

Skim milk may work better than whole milk, as the higher fat milk may clog a sprayer; even reconstituted powdered milk works.

Uses for Milk Fungicide

Milk was originally used in the garden to treat powdery mildew on squash plants. It is now also commonly used on flowers such as rudebekia (Black-eyed Susans) and Begonias to cure powdery mildew.

Milk has also been used to cure Botrytis on a Cyclamen houseplant. This was applied full strength every morning (leftover breakfast milk). Rotten leaves were picked away and the plant pulled through with no more Botrytis.

Black spots and rust on roses can be controlled but not cured with milk. Fortunately, milk can prevent the spread of these fungi to other plants and new leaves. This can be very useful when bringing home a plant from the nursery and finding a black spot.

The copyright of the article Milk as a Garden Fungicide for Powdery Mildew, Botrytis, and Black Spots in Organic Gardening is owned by Deborah Turton. Permission to republish Milk as a Garden Fungicide for Powdery Mildew, Botrytis, and Black Spots in print or online must be granted by the author in writing.

-------------------------------------------------------------------------------

by Arzeena Hamir
Powdery Mildew

Less than 3 years ago, researchers in South America discovered a new alternative to controlling powdery mildew. Wagner Bettiol, a scientist from Brazil, found that weekly sprays of milk controlled powdery mildew in zucchini just as effectively as synthetic fungicides such as fenarimol or benomyl. Not only was milk found to be effective at controlling the disease, it also acted as a foliar fertilizer, boosting the plant's immune system.

Powdery mildew in the cucurbit family is caused by the organism Sphaerotheca Fuliginea. It is a serious disease that occurs worldwide. For decades, organic gardeners had to rely on making a spray from baking soda to control the disease. Now, instead of measuring out the baking soda and combining it with a surfactant (a "sticking" substance) of either oil or soap, gardeners need only head for their refrigerators.

In his experiments with zucchini plants, Bettiol found that a weekly spray of milk at a concentration of at least 10% (1 part milk to 9 parts water) significantly reduced the severity of powdery mildew infection on the plants by 90%. While some gardeners may be tempted to increase the concentration of milk for more control, Bettiol found that once concentrations rose above 30%, an innoccuous fungus began to grow on the plants. How does milk control powdery mildew?

Scientist aren't 100% sure how milk works to control this disease. It seems that milk is a natural germicide. In addition, it contains several naturally occurring salts and amino acids that are taken up by the plant. From previous experiments using sodium bicarbonate, potassium phosphate, and other salts, researchers have found that the disease is sensitive to these salts. It is possible then, that milk boosts the plant's immune system to prevent the disease.

Milk used around the world
The benefits of using milk to control powdery mildew haven't been isolated to Brazil. Melon growers in New Zealand are saving thousands of dollars every year by spraying their crops with milk instead of synthetic fungicides. The melon growers in New Zealand have been so successful that the wine industry is taking notice and beginning experiments using milk to control powdery mildew in grapes.

What kind of milk should be used?
In Bettiol's original experiment, fresh milk was used, straight from the cow. However, this is obviously not feasible to most home gardeners. The research work in New Zealand actually found that using skim milk was just as effective. Not only was it cheaper, but the fact that the milk had no fat content meant that there was less chance of any odours.

Wagner Bettiol's original article was published in the journal Crop Science (Vol. 18, 1999, pp. 489-92).

Tall Grower · 02-02-2016, 12:29 PM

Thanks for the information. I really appreciate it!
I am really looking for some organic stuff. During my search this morning I also found the website www.stoppowderymildew.com. They sell UV-Lights to kill diseases like mildew.

Is there anyone who have some experiences with UV-Light or either with the website?

Daddysdank · 02-02-2016, 01:00 PM

I would use the products listed above to try and make it vthrough the rest of this grow unless it's very early on in the grow,after you finish,I would take and clean your greenhouse and saturate everything in it with Pysan20 walls,floor,ceiling everything then id let that dry and thrn follow up with a fungaflor fungicide bomb possibly 2 depending on the size of your greenhouse then I'd let that sit for a cpl days and drop a cpl more fungicide bombs and again let it air out..then I'd start with all new cuts. I know it seems like drastic measures and it alot but that's really the only way to eradicate the pm as if you dnt break the cycle it will be a continuous problem that will be continuous and more trouble in the long run..I had it once in my indoor grow and it cost me alot and I mean alot if time,down time,money and work but I had to do it to break the cycle..hope this helps even though it's probably not what u wanted to hear..hope you get your pm problem eradicated .I dnt wish pm on my worst gardening enemy's.

02-02-2016, 10:10 AM	#1
Tall Grower Newbie Join Date: Feb 2016 Posts: 7	How to kill powdery mildew? Hi, I am a newbie on this forum. Since a short time I am growing some veggies in a greenhouse. A few days ago I found some white stuff on the crops. After using google I find out that it's called powdery mildew. Does anyone know how I can fight against powdery mildew? Thanks in advance!
	Quote 1 members found this post helpful.

02-02-2016, 10:30 AM	#2
Robrites Senior Member Join Date: Jul 2015 Location: Orygun Posts: 3,220	Actinovate works good for me. A one-stop fungus fighter for gardens, lawns & hydroponics! Actinovate works from root to leaf with a concentrated beneficial microorganism (Streptomyces lydicus) that establishes itself on plants’ roots and leaves. This water-soluble organic fungicide knocks back diseases that attack your lawn, ornamentals and even edibles yet is proven to be safe around pets, people and the environment. OMRI Listed for use in organic production.
	Quote 1 members found this post helpful.

02-02-2016, 12:11 PM	#8
justanotherbozo on the bus ride of life. Join Date: Jun 2008 Posts: 1,606	...milk worked for me. ...here's some info that may help you decide whether or not to try it yourself. peace, bozo ----------------------------------------------------------------------------- Milk is a useful fungicide in the garden, and is more effective than standard chemical brands. Researchers believe the potassium phosphate in milk boosts a plant's immune system to fight the fungi. Where most organic gardeners use a baking soda, soap and oil solution, milk may be substituted to combat the unwanted fungus. Preparing a Milk Solution and Spraying Schedule The correct dilution and spraying schedule for garden plants depends on the situation and takes some trial and error. A milk fungicide solution can range from 1 part milk to 9 parts water, to a strong, milk-only solution. A 1:1 dilution may work for a week, but a 1:8 solution requires spraying every 3 or 4 days. Skim milk may work better than whole milk, as the higher fat milk may clog a sprayer; even reconstituted powdered milk works. Uses for Milk Fungicide Milk was originally used in the garden to treat powdery mildew on squash plants. It is now also commonly used on flowers such as rudebekia (Black-eyed Susans) and Begonias to cure powdery mildew. Milk has also been used to cure Botrytis on a Cyclamen houseplant. This was applied full strength every morning (leftover breakfast milk). Rotten leaves were picked away and the plant pulled through with no more Botrytis. Black spots and rust on roses can be controlled but not cured with milk. Fortunately, milk can prevent the spread of these fungi to other plants and new leaves. This can be very useful when bringing home a plant from the nursery and finding a black spot. The copyright of the article Milk as a Garden Fungicide for Powdery Mildew, Botrytis, and Black Spots in Organic Gardening is owned by Deborah Turton. Permission to republish Milk as a Garden Fungicide for Powdery Mildew, Botrytis, and Black Spots in print or online must be granted by the author in writing. ------------------------------------------------------------------------------- by Arzeena Hamir Powdery Mildew Less than 3 years ago, researchers in South America discovered a new alternative to controlling powdery mildew. Wagner Bettiol, a scientist from Brazil, found that weekly sprays of milk controlled powdery mildew in zucchini just as effectively as synthetic fungicides such as fenarimol or benomyl. Not only was milk found to be effective at controlling the disease, it also acted as a foliar fertilizer, boosting the plant's immune system. Powdery mildew in the cucurbit family is caused by the organism Sphaerotheca Fuliginea. It is a serious disease that occurs worldwide. For decades, organic gardeners had to rely on making a spray from baking soda to control the disease. Now, instead of measuring out the baking soda and combining it with a surfactant (a "sticking" substance) of either oil or soap, gardeners need only head for their refrigerators. In his experiments with zucchini plants, Bettiol found that a weekly spray of milk at a concentration of at least 10% (1 part milk to 9 parts water) significantly reduced the severity of powdery mildew infection on the plants by 90%. While some gardeners may be tempted to increase the concentration of milk for more control, Bettiol found that once concentrations rose above 30%, an innoccuous fungus began to grow on the plants. How does milk control powdery mildew? Scientist aren't 100% sure how milk works to control this disease. It seems that milk is a natural germicide. In addition, it contains several naturally occurring salts and amino acids that are taken up by the plant. From previous experiments using sodium bicarbonate, potassium phosphate, and other salts, researchers have found that the disease is sensitive to these salts. It is possible then, that milk boosts the plant's immune system to prevent the disease. Milk used around the world The benefits of using milk to control powdery mildew haven't been isolated to Brazil. Melon growers in New Zealand are saving thousands of dollars every year by spraying their crops with milk instead of synthetic fungicides. The melon growers in New Zealand have been so successful that the wine industry is taking notice and beginning experiments using milk to control powdery mildew in grapes. What kind of milk should be used? In Bettiol's original experiment, fresh milk was used, straight from the cow. However, this is obviously not feasible to most home gardeners. The research work in New Zealand actually found that using skim milk was just as effective. Not only was it cheaper, but the fact that the milk had no fat content meant that there was less chance of any odours. Wagner Bettiol's original article was published in the journal Crop Science (Vol. 18, 1999, pp. 489-92). __________________ "If a law is unjust, a man is not only right to disobey it, he is obligated to do so." .....Thomas Jefferson "Those that give up Liberty to have temporary Security deserve Neither"......Benjamin Franklin. "The further a society drifts from the truth, the more it will hate those that speak it." ..... George Orwell
	Quote 6 members found this post helpful.

02-02-2016, 11:26 AM	#4
Tall Grower Newbie Join Date: Feb 2016 Posts: 7	Thanks for your answers so far. How often do you have to use Actinovate till the mildew is gone?
	Quote

02-02-2016, 11:46 AM	#5
Robrites Senior Member Join Date: Jul 2015 Location: Orygun Posts: 3,220	It works best if you use it before you have a big problem. It works in the soil and if you spray it on your plants. I usually spray twice - 1 week apart. If it rains, you might want to spray it more.
	Quote

02-02-2016, 11:58 AM	#6
Tall Grower Newbie Join Date: Feb 2016 Posts: 7	Thanks for your info.
	Quote

02-02-2016, 12:29 PM	#9
Tall Grower Newbie Join Date: Feb 2016 Posts: 7	Thanks for the information. I really appreciate it! I am really looking for some organic stuff. During my search this morning I also found the website www.stoppowderymildew.com. They sell UV-Lights to kill diseases like mildew. Is there anyone who have some experiences with UV-Light or either with the website?
	Quote

02-02-2016, 01:00 PM	#10
Daddysdank Member Join Date: Dec 2015 Location: Up em dem hills Posts: 325	I would use the products listed above to try and make it vthrough the rest of this grow unless it's very early on in the grow,after you finish,I would take and clean your greenhouse and saturate everything in it with Pysan20 walls,floor,ceiling everything then id let that dry and thrn follow up with a fungaflor fungicide bomb possibly 2 depending on the size of your greenhouse then I'd let that sit for a cpl days and drop a cpl more fungicide bombs and again let it air out..then I'd start with all new cuts. I know it seems like drastic measures and it alot but that's really the only way to eradicate the pm as if you dnt break the cycle it will be a continuous problem that will be continuous and more trouble in the long run..I had it once in my indoor grow and it cost me alot and I mean alot if time,down time,money and work but I had to do it to break the cycle..hope this helps even though it's probably not what u wanted to hear..hope you get your pm problem eradicated .I dnt wish pm on my worst gardening enemy's.
	Quote