Powdery Mildew Solutions

[Habibi]

Hey everyone i just noticed a small powdery mildew problem on the bottom leaves of one of my SSH's. Was wondering what I can do to rid myself of this.

I used a full bottle of serenade on the whole crop, now im thinking about following up every other day with a hydrogen peroxide foliar spray (can anyone tell me how dilluted i need this stuff to be or if i should even use it) my local hydro shop advised against hydrogen peroxide but i hear it works well.

Thanks


(its been around 100 degrees during the day, the reason i got this powdery mildew is cause the sprinklers near the crop were turned on at night and water was sitting on the nearby grass overnight)


EDIT: fuck ive been saying hydrogen peroxide and really its baking soda. i found the perfect recipe, i just spoke to a local agriculturist and he said 1 teaspoon baking soda to 1 gallon water keeps all those nasty spores away and doesnt harm the wildlife!

 

[Guest]

What stage is your plant at?

I'd think of alternatives if this baking soda don't work. PM can be stubborn if it returns after you thought it was gone. Then it's ahead of you.

 

[Habibi]

theyre in veg so it shouldnt be hard to control, and its only one plant that i can see has anyone of the white dust on it.

what alternatives do you suggest?

 

[Guest]

what alternatives do you suggest?

Sulphur if it starts to spread. One brand we use is defender.

You can use sulphur in veg no problem.

If you see PM, it has been on your plants for at least 2 weeks and the spores are well anchored into the plant tissue. There's a good chance the other plants would show sooner or later.

Seeing it this early...I'd hit it hard. Your effective options get limited later in flower.

 

[HarryNugz]

SM-90 works real well also. Problem is, the environment around your plant. If you can't change the environment then you'll be chasing pm till harvest.

 

[Habibi]

the main problem was someone set the sprinklers to go on at 7 pm so the nearby grass gets watered twice. i turned that shit off right away when i noticed.


i used the seranade stuff once but one bottle only covers 6 plants one time. so its gunna cost me 10 bucks every time i apply that shit. i just tried the hydrogen peroxide on some and baking soda on the other it didnt burn the plants but well see if it gets rid of the pm. if not im just gunna have to continue using serenade.

thanks for the advice

 

[Guest]

Do you see powdery mildew on the grass?

 

[buzzmobile]

Add some insecticidal soap to the baking soda/water mix. The soap will help the spray mix adhere to the leaves. Spray every 3 days until the powdery mildew is under control.

 

[Habibi]

thanks im gunna try that.

there is no powdery mildew on the grass but some rose bushes that are kinda far away have it, i chopped them today as soon as i noticed it.

 

[Guest]

There's the culprit. I think the grass is safe and even if humidity is higher you still need the spores to get it.

There are air filters at places like Walmart if you are in a small space. They help to catch spores in the air. Also if feasible you can run a sulphur burner if it shows up again in flower.

 

[Guest]

I hope this is a help.

I hope this is a help.

The fungi which cause powdery mildew are spread by spores produced in the white patches. These spores are blown in the wind to other parts of the plant or to other plants during the growing season. Generally each species of fungus will be limited in the number of plant species that can be attacked. For example the species of fungus infecting lilacs will not cause powdery mildew on apples.

During the winter the fungus survives on infected plant parts and in debris such as fallen leaves. It may produce resting structures known as cleistothecia, which resist harsh winter conditions. These will appear as small black dots within the white powdery patches (Fig. 2). The next spring, sexual spores (ascospores) are released from the cleistothecia, shot up into the air, and carried by air currents to leaves of plants where new infections will begin. During the growing season, the fungus produces asexual spores (conidia) that help the fungus to spread and infection to build. This is the general cycle for most powdery mildews of outdoor plants. With houseplants the overwintering stage is of little significance. Depending on the environmental conditions indoors, the fungus could continue to grow and spread during the entire year.
Management Strategies
There are several effective fungicides available for different sites and plants, but use on plants varies with each product, and not all fungicides registered for use to treat powdery mildew may be used on all plants. Be certain the product you purchase is labeled for the intended use(s), and follow directions on that label.
For indoor plants, disease management includes gathering up and destroying fallen leaves, reducing relative humidity around plants, and spraying with a fungicide. In New York State, some products that may be used to treat powdery mildew on indoor plants include: sulfur (Lilly Miller RTU-MPF*), lime sulfur (Lilly Miller Polysulfide), potassium bicarbonate (Milstop or Remedy), jojoba oil, (E-Rase), Bacillus subtilis(Serenade Garden RTU*) and some products containing the active ingredients: neem oil or thiophanate-methyl.
For outdoor ornamental plants, gather up fallen leaves in autumn and destroy them. Where powdery mildew is a problem, resistant varieties (if available) should be grown. If needed during the growing season, begin fungicide applications when the first white patches are noticed. Repeat as indicated on the product label during cool humid weather. Some products with a broad range of applications for outdoor ornamentals include products containing: Bacillus subtilis, jojoba or neem oil, potassium bicarbonate, sulfur or lime sulfur. Some of these products may also be used to treat powdery mildew infections in the vegetable garden. Other products may also be available, so refer to the appropriate pest management guidelines or contact your local Cooperative Extension Office for more information.
Management of powdery mildew may be combined with the normal spray schedule . In New York State, some products that may be available for use include: Bonide Copper Spray/Dust, Elexa-4 (chitosan), multi-purpose sprays, and some products containing the active ingredients: Bacillus subtilis, neem oil, thiophanate-methyl, potassium bicarbonate, or myclobutanil.
Wettable sulfur is known to cause injury to some plants. Check labels for cautions about sensitive plants. If thiophanate-methyl does not seem to be controlling the disease, do not continue to use it. In some cases the fungus is able to develop a resistance to this chemical.

 

[Guest]

This is why my grandfather burned sick plants and anything that looked sick. Poor grandma looked a little ill and....lol

 

[Habibi]

North Farmer, id love to be able to use a sulphur burner or something of the sort but im outdoors and its impossible.

ripping the rose bushes was all i needed to do. im going to continue with serenade 2 more applications and then start with the baking soda mix + soap

 

[Guest]

Haha, well why didn't you say.

So it's in a yard I take it. I'd spray not just your pot then. Kill it on the other surrounding areas.

I've never had it outdoors before but I grow in the wilderness.