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R
Rogo
These are in week 4 of 12 and 12
Looks like powdery mildew.
I'm sure you will find a thread on immediate action
I'm sure you will find a thread on immediate action
...yeah man, that's powdery mildew for sure.
it's difficult to offer any useful advice on how you should handle this problem because there are several strategys that can be employed depending on what stage of life your plants are in and how large your op is and you don't share any of that kind of information.
...the first thing i'd suggest is that you research powdery mildew and learn it's lifecycle, as a living organism it has certain needs and preferred conditions and if you understand those needs and conditions you can ensure your grow is unsuitable to this pest, ...powdery mildew spores are pretty much everywhere so if the conditions are right, the spores germinate and you get powdery mildew, period.
...frankly, this is the best strategy for any pest, understand it's lifecycle so you can learn to interrupt it.
...anyway, IF you have a smallish grow, say a 4 x 4 or even a 5 x 10 AND you are in flower so can't use harsh chemicals, one very effective organic treatment is a milk shower, actually several milk showers, say every 3rd day for about 2 or 3 weeks or until harvest whichever comes first.
...just mix any kind of milk be it whole milk or 2% or low fat, hell, even powdered milk will work if you mix if up good, anyway, mix it up at about 10 parts water to 1 part milk and then put that into a spray bottle and spray that milk mixture on your plants and be sure you get the undersides of the leaves, be thorough.
...you will be amazed to see the pm completely disappear but don't be fooled, powdery mildew is a systemic disease like an infection so it WILL come back so you'll need to re-apply the milk solution every 3 days as i said above.
...below i've included some info i found several years back that documents some of the science on WHY milk works so you'll know that there ARE effective treatments that don't come out of some chemical company, ...did you know that asperin comes from willow trees?
peace, bozo
btw, be sure you wash out your spray bottle after each use or the nozzle will become clogged with curdled milk, ...any unused solution should be stored in a seperate container in the refrigerator although you could just toss it and mix up a fresh batch every 3 days.
------------------------------------------------------------------------
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).
it's difficult to offer any useful advice on how you should handle this problem because there are several strategys that can be employed depending on what stage of life your plants are in and how large your op is and you don't share any of that kind of information.
...the first thing i'd suggest is that you research powdery mildew and learn it's lifecycle, as a living organism it has certain needs and preferred conditions and if you understand those needs and conditions you can ensure your grow is unsuitable to this pest, ...powdery mildew spores are pretty much everywhere so if the conditions are right, the spores germinate and you get powdery mildew, period.
...frankly, this is the best strategy for any pest, understand it's lifecycle so you can learn to interrupt it.
...anyway, IF you have a smallish grow, say a 4 x 4 or even a 5 x 10 AND you are in flower so can't use harsh chemicals, one very effective organic treatment is a milk shower, actually several milk showers, say every 3rd day for about 2 or 3 weeks or until harvest whichever comes first.
...just mix any kind of milk be it whole milk or 2% or low fat, hell, even powdered milk will work if you mix if up good, anyway, mix it up at about 10 parts water to 1 part milk and then put that into a spray bottle and spray that milk mixture on your plants and be sure you get the undersides of the leaves, be thorough.
...you will be amazed to see the pm completely disappear but don't be fooled, powdery mildew is a systemic disease like an infection so it WILL come back so you'll need to re-apply the milk solution every 3 days as i said above.
...below i've included some info i found several years back that documents some of the science on WHY milk works so you'll know that there ARE effective treatments that don't come out of some chemical company, ...did you know that asperin comes from willow trees?
peace, bozo
btw, be sure you wash out your spray bottle after each use or the nozzle will become clogged with curdled milk, ...any unused solution should be stored in a seperate container in the refrigerator although you could just toss it and mix up a fresh batch every 3 days.
------------------------------------------------------------------------
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).
PM jumps out as immediate possibility,
Are you spraying anything on them right now? Foliar feeding? Pesticides? Plain water to raise humidity?
Are you spraying anything on them right now? Foliar feeding? Pesticides? Plain water to raise humidity?
R
Rogo
Thnx Bozo that's great. That is also what I started doing. The plants are in week 4 of flower and are thriving. I just noticed these spots on a few upper leaves. I started running a dehumidifier and put the fans a little closer to plants and bumped up the temp a few degrees. Also, doing the milk thing. Keeping my fingers crossed because this is a beautiful promising 4x4 crop at the moment. Thnx again everyone...
...like i said you'll be amazed at how effective the milk seems, and it IS, but remember, you'll need to reapply every 3 days for at least a couple of weeks, after that you can start to back off if you want or you could just continue to spray your plants with milk right up until harvest.
...one caution i would give you is to not over spray the actual buds, at 4 weeks they are just now really forming up so they are small and safe to spray but as you approach the end of the cycle try to concentrate on the leaves and avoid the buds, ...you don't have to be manic about not spraying the buds mind you but once they start to get big you don't want to soak the buds or you run the risk of moldy buds.
...another useful strategy would be to defoliate at least to some degree, the more open your airflow is the more difficult it is for pm.
...here's a thread discussing de-foliation for yield so not related to a pm infection but there is still much useful information and SOME of it is applicable.
https://www.icmag.com/ic/showthread.php?threadid=174163Defoliation: Hi-Yield Technique?
peace, bozo
I fought PM with just fat free milk 30/70 and won the battle ..
I used it through flowering with no ill effects/taste on the final product.
Turn the ladies nice and green as well. .
Fight the good fight. ..
Peace...AD....
.
I used it through flowering with no ill effects/taste on the final product.
Turn the ladies nice and green as well. .
Fight the good fight. ..
Peace...AD....
.
