H202 vs Baking soda in late flowering for powdery mildew?

[smokesalot420]

Hello everyone!

Im growing a Blue Cheese in organic soil under a 400 HPS that is now day 45 of flower that has a few spots of PM on some leaves. I sprayed serenade about 2 weeks ago which I didn't like because of the smell it left (I wont say what it smells like lol) and because it killed off all of my pistils. I sprayed with 8.0 ph water a week later and didn't see it again until last night. I am tryin to take her to about 65 or so so I have 3 weeks to go, 10 days before I start my flush....

I have searched and read many posts, the majority saying to use baking soda or h202, or to use zone and penetrator as a combo or serenade.... Some posters who used baking soda complained about burning thier plants or being concerned about stopping bud growth. A few posts said h202 worked, but didn't give a dosage to use for 3% h202. I also recently innoculated with subculture-b hoping the tricodermia would help but Im not sure if it will this late...I also heard about people using neem but I am unsure how safe that would be this late in flowering. Thanks a lot

 

[smokesalot420]

bump, anyone?

 

[yohomz]

At this point, my guess would be that it's pretty much too late to save this plant/crop. Prolly just harvest it and take what u can. You may want to consider a sulfur burner if you continue having this problem.

 

[MynameStitch]

You can prune some of the leaves that have been infected and discard them out of the grow room, lower humidity levels and you can use milk, 10 parts water 1 part milk.

You can use baking soda /water mixture, but you may have to wipe it or rinse it off. If people are complaing about it burningf there plants, then they used too much baking soda and or when they went to reapply it they added more on the plant before washing it off leaving high alkalinity on the leaves and burned them.

Neem can burn the plants if not used properly.
I would not use it this late in flowering though. you could use h202, use 2 tsp 3% per gallon of water and shake and take something to wipe the leaves with that are infected, any way you go it may be time consuming since you are late into flowering.

There is not much you can do since so far into flowering and not wanting to get the buds infected.
sulfur burner can work, some don't like using it late in flowering due to smell and taste issues if I remember correct;y, but if you use it PROPERLY then you should not have a problem.... personal preference I believe.

 

[molly]

Hey, don't worry about losing your crop. PM most of the time can easily be fixed. Go to the store and buy a bottle of sulfur. Spray it on the plants when the lights are off and allow for 4-6hrs to dry. There are numerous brands at the store, walmart probably even has it, just make sure the ingredients say sulfur. They sometimes add pyrethrins which are just natural plant defense compounds, and can be an added benefit.

If you have any pure alcohol, isoprop or something, you can use that too. Put it on a paper towel and blot the affected areas. Again, when the lights are off.

If you can post some pictures, I'm sure other people can help you more.

 

[molly]

You can prune some of the leaves that have been infected and discard them out of the grow room,


Neem can burn the plants if not used properly.
I would not use it this late in flowering though.

Sometimes pulling off the most affected leaves is actually pretty effective. You might want to consider that. And just for opinion sake, I love neem. I use neem whenever, wherever. Only thing is to do it when the temperature is below 80-85F, ideal 70-75. Or else you burn them like he said, simple as that. No lights on of course.

 

[MynameStitch]

Well I agree with you, but you want to try not to disturb by cutting it sometimes it throws more spores in the air, not that they are already there, but you want to try to keep it minimum as possible.

 

[bloodrun99]

Yeah, don't use sulfur burner! the stuff will give you serious heartburn when smoking. (not that we inhale)

 

[EthnobotanicA]

a bad latte works pretty good too. No, seriously. Let some milk sour, or use buttermilk, and mix it in with coffee...and some soap. Bad milk has beneficial microbes in it, and both milk and coffee are alkaline, plus coffee is full of trace elements.

 

[hazy]

I fight PM everyday. I'm sure it's always going to be this way.
I sometimes use NEEM, but only in veg. It leaves a terrible taste on buds.

I use SM90 on flowering plants but only for the first few weeks. It's taste is not as bad as neem.

I use Greencure all the time on everything. I'll spray it directly on the buds if I have to. Usually the PM is only on the leaves. I search over every plant every day, and spray greencure on the PM. I try not to get it on the buds too much. It's potassium bicarbonate. It kills it pretty much instantly. Do not scrap your crop get Greencure. Use baking soda till you get it. 1 or 2 tablespoons per gallon of water.

edit: hahaI just noticed this thread is old so i guess he came up with something.
coffee huh?

 

[ridgedogs]

I would take off affected leaves and anywhere leaves are trapping moisture (overlapping leaves) for better circulation. It's a better alternative than harvesting early. Turn your fans off before you go to work.