powdery Mildew

[Marathanman]

Just got in to find half my plants covered in Powdery Mildew especially the Cheese x NL never had this before can it be transfered from cuttings or is it just from the air? So far I've added another oscillating fan and put fans on 24 hours a day plus trimmed off all the infected leaves Is it serious or can it be easily eradicated was thinking of using Silicon any advice would be gratefully appreciated.

 

[roll it large]

Are these in flower or veg pal?

 

[Lazyman]

Eagle20 is the only cure, anything else is just treating outward symptoms.

 

[daoboxer]

Powdery Mildew is caused by several types of fungi, Marathanman. It won't be passed on genetically from mother to cutting. It will be passed around your garden as airborn spores, or by coming into direct contact with a surface affected by PM. My guess is that it may prove an effort to eradicate.
I've no idea of the best treatment.

 

[roll it large]

Multirose 3in1 has the same active ingredient as eagle 20 mycobutinol and it works my mate uses it an i use it as a preventative its only safe in veg tho takes 14 days to leave plant its only systemic good luck pal

 

[LittleAmsterdam]

PM can cured by changing the PH level on the leaves. I routinely spray with filtered water and a drop of PH UP. The extra potassium in PH UP helps with keeping the leaves green and growing more roots

Eagle 20 and others are systemic and I don't know if I want to be smoking that....

 

[B. Friendly]

PM can cured by changing the PH level on the leaves. I routinely spray with filtered water and a drop of PH UP. The extra potassium in PH UP helps with keeping the leaves green and growing more roots

Eagle 20 and others are systemic and I don't know if I want to be smoking that....

My thoughts exactly... i don't want to smoke anything that is technically a poison
speaking from the horticulure industry we wear suits when spraying anything. hmmmm why is that????
anyways I like the PH up tip... and you can always run a sulphur burner, but i like the sound of spraying with ph up, it will not leave anything behind, not even that sulphur taste...

Puff on
B.

 

[krunchbubble]

PM can cured by changing the PH level on the leaves. I routinely spray with filtered water and a drop of PH UP. The extra potassium in PH UP helps with keeping the leaves green and growing more roots

Eagle 20 and others are systemic and I don't know if I want to be smoking that....

My thoughts exactly... i don't want to smoke anything that is technically a poison
speaking from the horticulure industry we wear suits when spraying anything. hmmmm why is that????
anyways I like the PH up tip... and you can always run a sulphur burner, but i like the sound of spraying with ph up, it will not leave anything behind, not even that sulphur taste...

Puff on
B.

if you use eagle 20 in veg or very early flowering, there is no way your going to ingest the same plant material.....

id rather make sure the powder mildew is gone once and for all, instead of TRYING to get rid of it.....

and after you use eagle 20 for the first time, you don't have it anymore. thus you don't have to keep reapplying whatever bandaid your trying.....

 

[roll it large]

PM can cured by changing the PH level on the leaves. I routinely spray with filtered water and a drop of PH UP. The extra potassium in PH UP helps with keeping the leaves green and growing more roots

Eagle 20 and others are systemic and I don't know if I want to be smoking that....

Pm can not be cured once you got it thats it you got any evidence to back your claim up scientific research would be nice

 

[LittleAmsterdam]

Even systemic is NOT a cure and needs to be applied routinely as per directions

 

[roll it large]

if you use eagle 20 in veg or very early flowering, there is no way your going to ingest the same plant material.....

id rather make sure the powder mildew is gone once and for all, instead of TRYING to get rid of it.....

and after you use eagle 20 for the first time, you don't have it anymore. thus you don't have to keep reapplying whatever bandaid your trying.....

What he said

 

[LittleAmsterdam]

Powder Mildew in NOT a systemic disease. It's a fungus that lives on top of your leaves and spreads via spores and wind spreading them to the next leaf or plant. A fungus is NOT systemic to a plant, but a host to it. That's SCIENCE !

I much rather change the growing environment and not allow PM to grow. I also choose to spray with a drop of PH UP versus a systemic fungicide in hopes I won't smoke it or taste in later.....

 

[igro3s]

!!!!! eagle 20 !!!!! IT KILLS POWDER MILDEW..... AND INCREASE YOUR AIR FLOW. THAT SHOULD DO THE TRICK.

 

[theherbalizor]

Yes just to repeat.

Pm is air born. Not a systemic infection. But as it is air born systemic action is really the only method of eradication.

Anything that contains mycobutanil will do the trick. I like systhane fungus fighter. Only £4 for concentrate that will last a long time.

Pm is totally curable . But you really must clean the room down. Intensively. Best yet sulphur bomb.

Any one who experiences otherwise is either not using systemic fungicide and or cleaning down.

If your in late flower then you can use Canadian express p.m.t.. It's a bacteria product totally non toxic and is safe to use on day of harvest. It also prevent bud rot. Say you saw an outbreak at day 50 on you 63 day run then dowse daily with pmt. All will be fine.

I have not treated for pm for year or so but as a few are reporting it and I'm noting it on plants natively growing in my neiborhood then I think a few preventative mycobutanil apps are in order.

Vigilance is the key.

 

[r1rider]

I too am suffering with PM, and i`m about 4 weeks away from the end of this grow.

I tried the milk spray, but now i`m using Plant Rescue from westlands, as it is ok for fruit flowers and edibles.
I`v been told that spraying with a solution of water and H2O2 is effective, but never tried it.

My room will be down for a couple of months or more so it will get blitzed by cleaning then.

r1

 

[Marathanman]

Thanks for all the advice fortunately I'm still in veg. I've trimmed all the infected leaves off cleaned out the whole room, added an extra fan plus leaving all fans including extractor on 24hrs a day. Will look for the eagle 20 or similar spray not too worried about spraying with chemicals at this stage about 4 weeks into veg still got to repot to bigger pots and veg for another 3 weeks yet.

 

[Marathanman]

As Herbilizor says the UK version of eagle 20 seems to be Systhane Fungus Fighter plus its cheaper will defo be giving it a try. I was moving my Nevilles Haze out fo the grow room into a damp dark closet to give it 12 hours darkness reckon I will have transferred the PM from the closet.

 

[VerdantGreen]

i'm hesitant to tempt fate and say this but ive never seen PM on a cannabis plant, possibly because im lucky or possibly because my environment doesnt encourage it. as someone who gardens for a living there are a few things that ive observed and learnt that will help.

1. water stress - PM often occurs on plants in general when the weather is very dry and then the plants get a soaking. whilst a wet/dry cycle is good up to a point for cannabis, try and avoid plants getting dry to the point of stress.

2. ventilation/circulation. PM's trump card is that it can infect plants in low humidity conditions - whearas most fungus needs moisture. the reason for this is that the spores have a high water content - so having moving air can help to physically stop the spores settling on the plants in the first place.

3. soft sappy growth that you get when N is too abundant is much more likely to get infected than plants that have grown in moderate N levels.

it is likely that spores will always be around or sucked into your growroom so prevention is just as important as cure imo.

hope that helps...

VG

 

[VerdantGreen]

for cure it may be worth looking into UVC / germicidal lamps. a quick once over with a hand held one of these may well kill the PM without much damage to the plant - but remember they need to be handled with caution as UVC is very bad for human skin/eyes.

VG

 

[LittleAmsterdam]

The BEST cure for PM is to make your environment hostile for PM to survive ! PM can not survive in a HOT, DRY, WINDY environment.

Change your environment and save your plants from unnecessary fungicide !