powdery mildew days before harvest

[mateo]

i have been maintaining my mildew issues pretty well thru flower. though, now days from harvesting, and i have spotted multiple buds with mildew forming again!

does anyone have suggestions for what i can spray this late without ruining the nugs???

 

[desertsquirrel]

the only thing thats labled for that late is the ed rosenthal product. I forget what its called but i have some ill go look...

That being said i dont know if i would use it...

best bet is to bring room humidity down as low as possible and when you cut the pm out make sure you remove tissue outside of the bud only. If you cut into the bud it provides a foothold for the Pm to move inside, and thats when you have a REAL problem.

 

[DixinCider]

greencure is the only thing you can do man. i would do one scoop per 32oz spray bottle.
it's organic and doesnt leave a taste or residue

 

[Tobor the 8th Man]

And you might be able to get greencure at a True Value hardware store. They carry it at my local one back in plant pest control section.

If it is only days I would just chop. Or use baking soda and water. You just need to change the ph of the leaf to alkaline to kill pm early on.

 

[bloads]

greencure is the only thing you can do man. i would do one scoop per 32oz spray bottle.
it's organic and doesnt leave a taste or residue

I'll attest to that dosage. Works like a charm.

 

[Seamaiden]

I found GC left a soapy taste that I don't care for. I would recommend OxiDate or other similar (H2O2) product that, once evaporated, leaves absolutely no residue. And, I would dip the entire branch/plant once it's harvested, too.

 

[skatwill1227]

Green Cure is potassium bicarbonate with a surfactant. Potassium Bicarbonate turns to CO2 and H2O when ignited, so the soapy taste is probably from the surfactant. If the mold is only on a few little buds you are best to just count the loss and move on. PM is a never ending battle especially with a perpetual grow.

 

[coloradochem]

try the h202

 

[bloads]

I found GC left a soapy taste that I don't care for. I would recommend OxiDate or other similar (H2O2) product that, once evaporated, leaves absolutely no residue. And, I would dip the entire branch/plant once it's harvested, too.

Interesting. Dip it straight into h202, or a water mix? This is right before you hang them to dry?

 

[Seamaiden]

H2O2 mixed as a Tx for PM, then dip the plant. Yes, right before they're hung up to dry.

This is easiest when growing in a SOG style because the plants are small and compact, usually a single stalk so all you have to do is snip the main stalk, dip her (and dip her well, you want all spores to be hit with the H2O2), hang her. A slight shake to get off the excess moisture is prudent, too, because they do hold a lot of moisture when dipped this way.

 

[sanvanalona]

The dipping in water doesn't affect the flavor after the dry? I have never heard of this before but I like the idea if it works.

 

[altitudefarmer]

H2O2 is excellent; and leaves no taste. Too high a concentration tho, and you'll bleach you pistils and damage plant matter to some degree (don"t ask how I know...lol).
Also I've found that 91% isopropyl and water in a 50/50 mix will rid your PM. Good luck!

 

[Seamaiden]

Oh, another good use for the ISO! Thanks, alt. :)

The dipping in water doesn't affect the flavor after the dry? I have never heard of this before but I like the idea if it works.

Nope. But GC does, IME.

 

[og_kid]

i know your pain this is last year she was so close.:evilgrin0040:

 

[bloads]

H2O2 is excellent; and leaves no taste. Too high a concentration tho, and you'll bleach you pistils and damage plant matter to some degree (don"t ask how I know...lol).
Also I've found that 91% isopropyl and water in a 50/50 mix will rid your PM. Good luck!

Would the isopropyl strip out THC though?

 

[manisthebastard]

Would the isopropyl strip out THC though?

that was my first thought as well.

 

[Tobor the 8th Man]

I should have mentioned this earlier. PM is actually a weakling in the world of molds and plant diseases. It has too have a rather strict ph range to grow and thrive. That is why most of the spray cures work. They change the ph and make it alkaline.

Well it also has a very strict range of temperature and humidity. It basically loves cool and moist. Take away one of them and it won't be able to grow on the leaves and buds. I had it once when I tried to grow in an unheated basement. I put a space heater in there and it was 80 degrees with lights off and 84 with lights on. The PM went away in 3 days but noticeably retreated every day. The heater dropped the humidity way down too which also helped.

seamaiden did you mix some soap or something else to make the greencure adhere better?

I know people say they get horrible cases of systemic PM. I don't doubt them but I don't know if that is possible or not. I don't think it would matter what the outside environmental conditions would be for systemic PM and I don't want to imply an easy fix for that. However, PM should not be able to grow on leaves or buds if the temperature is warm and the air is dry.

 

[Seamaiden]

Why on earth would I do that, Tobor? It was water + GC mixed according to package directions.

All powdery mildew, once it is observed on the plant, is "systemic."

I have experienced PM that occurred in dry conditions, less than 30%RH (in the mountains) and warm conditions. There are many species of mold that are known collectively as 'powdery mildew', I think a lot of folks either don't know that or don't appreciate it.

I've also experienced, and had my worst, most difficult to treat bout that ended up requiring the systemic treatment, powdery mildew vectored by root aphids. And if that shit doesn't drive you bat-shit, I don't know what would.

 

[Badmf]

After spraying with GC and just before harvest "Rinse" spray with tepid Ph adj H2O, rids any residue build up. I also rinse off Neem a day after treatment to clear off the stomatas surface. I won't use any alcohol even diluted will lose some trikes.

 

[bloads]

H2O2 mixed as a Tx for PM, then dip the plant. Yes, right before they're hung up to dry.

Not sure what that means :)

How much H202 per gallon of water?