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Strange white powder late flowering

KosmoKramer

KosmoKramer

Member
Noticed this strange white powder-like stuff on one of my plants about a week ago.

First thought was "oh shit something hermied". At first I thought it was pollen drops because there were mostly perfect circular spots of this stuff on what appeared to be the lower areas of the plant. Careful examination revealed no nanners that I could see, and there wasn't any "spent shells" or nutsacks on the plant or laying underneath.

I let the plant finish up (was flushing when noticed) and was expecting some seeds come harvest time. Weird thing is the areas on the leaves where i noticed the "drops" started turning white all the way thru the leaf like it was killing the leaf. No seeds found, and a more thorough exam at harvest still didn't reveal any nanners/nutsacks.

Grown DWC, temps are around 72 lights on, RH is low at 25% or lower. No new cuts/clones ever. All strains grown from seed. I've never had a single bug in my garden in the 4+ years I've been growing so I don't think its anything bug related.

Any ideas peeps? I'm stumped
 
A

alamony2005

Active member
My vote goes with Powdery Mildew also, since your that late into flower, chop them down stat and try and move that product quick as it will rot out your plants...
 
N

northstate

Member
ICMag Donor
You have a case of PM (Powdery Mildew) the white fluffy cotton crap is the spore that grows up through the tissue of your infected plant and is trying to find a new host. Clean really well after this round, spray and wipe it ALL. Check intake filter, and if you arent running a mild hydro fungicide maybe a thought? That also looks like carpet on the floor to me, you might want to cover that if you can with plywood then plastic. Research PM and change your environment(usually the culprit) hopefully it all works out for you. NS

p.s. a light spray or dip of correctly mixed ascorbic acid before you dry will neutralize it
you dont want to smoke that stuff.
 
KosmoKramer

KosmoKramer

Member
Ooops. Had the album set on private when i uplaoded the pics. Sorry

Powdery mildew huh? Not good. Kinda what I was thinking, but with RH so low I didn't think PM could form or prosper.

Thanks peeps. Got to do some research on cures to rid this shit from my tent. Will a simple wipe down with a mild cleaner/disinfectant rid it? Wil smoking it have adverse effects of peeps health?
 
Tactical Farmer

Tactical Farmer

Member
PM is pretty high on the shitty scale, one little spot can have trillions of spores ready to go airborne & spread.

Quite bad to smoke or so ive read here.

No doubt its PM, dry it quick & use a sulfur burner to slow its growth, it will spead & grow during drying & will really fuck shit up if you jar it slightly moist.
 
stoney917

stoney917

i Am SoFaKiNg WeTod DiD
Veteran
u cant totatly kill it this far along but u can fight it if ya have a few wks to go. i spray milk and water 4/1 water to milk ratio and it stops it but u have to keep an eye out and treat as needed. one day before chop u can spray with high ph water to kill whats left . all of this is based on u not havin a full blown infection if ya do just cut ur losses and takem dow clean everything. do not sell or smoke the bud.
 
A

alamony2005

Active member
Please refer back to the Eagle 20 to end your problems in your veg room and call it done. Also on your suggestion Stoney917 below is what I found.

I would not start spraying additional products which will not only attract other pests near by. The ratio is 9parts water to 1 part milk as described in the below article. I would NOT spray my plants... ever smell spoiled milk after its been sitting out? No thanks...

(From: New Scientist

Spraying milk on cucumbers kills mildew
THE doorstep pint has the makings of an ideal fungicide for protecting organically grown cucumbers and other vegetables, according to researchers in Brazil. It attacks a mould known as powdery mildew, which is a major problem for organic farmers scrambling to meet the growing demand for chemical-free vegetables.

The mould, Sphaerotheca fuliginea, appears as a powdery white growth on the leaves of cucumbers and courgettes (zucchini). It damages the plants by causing the leaves to shrivel up. At present, only chemical fungicides are available.

Milk's fungicidal powers were discovered by Wagner Bettiol of the environmental laboratory of Embrapa, the Brazilian Agricultural Research Corporation, in Jaguariuna, north of São Paulo. Bettiol, who was looking for cheap ways to control plant pests, observed that byproducts from milk-processing factories killed powdery mildew on courgettes. So he decided to simply spray fresh milk on the plants to see if it had the same effect. To his surprise, he found that it did. In fact, spraying heavily infected plants twice a week with a mixture of one part cow's milk to nine parts water was at least as good at stopping mildew as the chemical fungicides fenarimol and benomyl, Bettiol discovered.

In many cases, milk was both faster and more effective. After two to three weeks of spraying with milk, the area of leaves infected was in some cases only a sixth or less of the area affected on plants treated with chemical fungicide (Crop Protection, vol 18, p 489). Bettiol says several organic growers in his region have successfully controlled less severe mildew infections on courgettes and cucumber by spraying once a week with 5 per cent milk solutions.

Bettiol is not yet sure why milk works so well, but he speculates that it helps the plants in two ways. Milk is known to kill some microorganisms. It also contains potassium phosphate, which boosts the plant's immune system and so may help it inhibit the mildew's growth.

"If this works, it could be very useful," says Rob Haward of the Soil Association, which sets standards for organic farming in Britain.

Author: Debora MacKenzie)
 
KosmoKramer

KosmoKramer

Member
Went out and picked up some Greencure. Funds were low and it was readily avail at the local hydro store. Based on what I observed, I considered my infection to be moderate. Some leaves had up to 1/4" circles on them.

Sprayed the plants in the flowering tent using 2 Tbs per gal as directed on the label for moderate case. Soaked em good everywhere last Saturday. Week later and I see no powdery spots anywhere on the plants.

For a small personal grower like myself I'd recommend this stuff easily based on the results seen so far. Just now seeing a few small spots in my veg area. These will be getting a diluted soaking this week.

I'll try to post some before/after pics with a couple updates in the next few weeks. $18 for a jar of this stuff well worth the money IMO
 
KosmoKramer

KosmoKramer

Member
GreenCure. Potassium carbonate.

Update:

Camera on the fritz so sorry no pics. Did see some returning of the PM, but it was much much less and only on the lower/inner leaves/buds. Don't see it anywhere else so I'm going to assume I didn't spray that area well, or missed it all together.

Sprayed 4 clones that were put into flower earlier in the week. Made sure I soaked them good all over. Haven't really noticed any PM, wasn't much on them before spraying. But then again I haven't looked for it yet.

Post back in another week and we'll see how things progressed

BTW: Did the skim milk thingy posted above in the midst of a panic. Messy and somewhat stinky. Use as an emergency/last resort if there is no way to get anything else. Not sure if it works, but not recommended for indoors
 
Last edited:
grapeman

grapeman

Active member
Veteran
KosmoKramer said:
Went out and picked up some Greencure. Funds were low and it was readily avail at the local hydro store. Based on what I observed, I considered my infection to be moderate. Some leaves had up to 1/4" circles on them.

Sprayed the plants in the flowering tent using 2 Tbs per gal as directed on the label for moderate case. Soaked em good everywhere last Saturday. Week later and I see no powdery spots anywhere on the plants.

For a small personal grower like myself I'd recommend this stuff easily based on the results seen so far. Just now seeing a few small spots in my veg area. These will be getting a diluted soaking this week.

I'll try to post some before/after pics with a couple updates in the next few weeks. $18 for a jar of this stuff well worth the money IMO
Click to expand...

Greencure is a good product this close to chop. You may have to repeat the spray. Next grow try a real fungicide just before you move the plants into flower and again 3.5 weeks into flower and you won't see it again.
 
KosmoKramer

KosmoKramer

Member
I agree. Seems like a good control product, but seems like it doesnt actually kill the PM. Based on the product decription, and from personal experience, I'd say it kills/eliminates the spores (cottony stuff) but not the actual infection.

When funds are available, its a bottle of that Eagle 20 and a good spraying of the momma/veg area to rid that shit once and for all.

Thanks for the help and input folks :thank you:
 
yortbogey

yortbogey

To Have More ... Desire Less
Veteran
i'm with the milk thang.....
1 part milk
1 part neem
1 part H20s

spray....every couple dayz......works well az long as U kill of the spores in the environment as well.....
 
G

GreenLion

You can spray shit all day...but if your enviroment isnt dialed it wont help much.. Moisture is at hand here. if you have a big rez in your room without a lid on, it can be a problem.. a small heater in the night cycle to try n keep humidity down and to dry things out will help, as this is when it will be at its highest. powdery mild loves cold damp unvented areas. and has a hard time growing in dry warmer well vented areas. Also try avoiding getting too dense of a canopy, what you get when you start plants off too close to each other and they start growing into one another too much. thats my 2cents, hope it helps!
 
krunchbubble

krunchbubble

Dear Haters, I Have So Much More For You To Be Mad
Veteran
greencure always turned my hairs brown, didn't like that........

a 10% hydrogen peroxide spray will kill the powder mildew and will be safe to ingest....

on day of chop, drench the plant with the 10% solution, dry in from of a fan and trim, no powder mildew!
 
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