Powdery mildew in my Mazar?

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Does this look like Powdery mildew to you guys? Ive had some trouble with the humidity in my grow room, of 20 plants about half got what I belive is powdery mildew. Powdery flour-like buildups in the buds. At first I thought it was just crystals in one of my Mazar's(the one first attacked). But I noticed it was spreading, first slow, but later fast.
I Sprayed the plants with H2O2 and together with a new dehumidefier it helped a lot. The powder in my buds as good as totally disaperred a couple of days after the spraying, but I think if I stop spaying maby it will come again.

Now, today and yesterday I'm noticing yellow spots at my leafs at my Mazar. The spots appears to be spreading to the other plants but I dunno if It might be a fertiliser prob or something. only about 4 plants got this. Maby its just the plants way to say "I'm ready", cause I'm about 9 weeks of flowering.

I grow in soil, mixed with a little champost(mushroom compost?!) and a little leca. I use Advanced Hydroponics grow 2,5ml/10L micro 5ml/10L and bloom 7,5ml/10L every time I give them water. Though the last to watering i jused ony tab water. 2* 400W HPS and a temp. of about 25 degrees celcius.

I wil try to post 2 pictures, the first of when I had the PM, and the second of my current problem.

ok. I cant post pictures in this thread?! Tried to post two pictures I uploaded at ImageShack, but when I press submit new thread it tells me that I have to remove the urls.. Plez help. Im a noob in this computer/forum/pictures-thing.

 

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Ive added the two pictures in my personal gallery.

 

[DIGITALHIPPY]

first post huh? let me be the first to welcome you!
PM is awful. i had some of this for the first time right now...
best thing is to get a dehumidifyer, pm likes 60-80 and high humidity. so cut out the humidity. and get some safers 3-in-1 from home-de-pot(home depot) for 5-6$ and use it on the fluffy/powdery leafs. i tried cutting the affected leafs off, but the sports float off the leaf and infect others.
if your more then 4 weeks from harvest (looks like ur closer then that) a sulfer burner would help alot to eliminate the problem.
if you could take mroe pics or get a closer shot it would be nice, but i could tell from the ones u gave. also look inside the cannops the pm accumilates where there is stagnant air and leafs are ontop of eachother.

 

[Guest]

hey bro. mazar was some of the most potent shit I've toked and you look almost done.

Okay so with some help if I can. In the 1st pic I see nothing but trichomes but is a little fuzzy but all looks ok to me. Quite nice actually. the second however is cleary nute lock/burn if you ask me. It looks like yellowish brown chem burn. Some clear pics and dif shots will help. I'll stay tuned. If they're locked then a good flush is important. The more I look at the 2nd pic the more I say built up shit. Esp if you are hitt'n em every feed like that.

 

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DigitalHippie - Thanx man, I was gonna write in the "introduce yourself" thread, but Ive been struggeling for more than two weeks with the registration(and with the Powdery mildew) så I could enter this forum. Found out, my hotmail blokked the registration-email.
So when I finally entered, I had to ask about the Powdery mildew asap.

I have got a dehumidifier, and It helped together with the h2o2. I have a humidity of about 20-30% right now and both the humidifier and my fans are running 24/7. What are "safers"?? I come from Denmark and dont know of any product by that name.

Calyxlover - Great to hear that! never tried it but been growing mtf for some grows now and wanted to try something else..(mtf is a wonderfull plant though). If you look closely at the first shot you can se that a tiny leaf right in the middle is covered with powder. I cant find a better shot cause I spray my plants every other day with h2o2. This seems to keep the mildew down. Ive taken some new shots of my mazar and some of the other plants as well. I think maby your right about that nuteburn, almost all of my plants leafs have changed color damaticly in the last 14 days.. some are becoming yellow and falls of, while others are becoming red to almost black. Take a look in my gallery and see what you mean. Do I feed to much nute? I thought I was giving them the right dossage.

I'm starting new plants up as we speak. Is my room infected for life? or can I prevent the new ones from getting the same shit? I'm thinking of the powdery mildew offcourse.

 

[Guest]

DigitalHippie - Thanx man, I was gonna write in the "introduce yourself" thread, but Ive been struggeling for more than two weeks with the registration(and with the Powdery mildew) så I could enter this forum. Found out, my hotmail blokked the registration-email.
So when I finally entered, I had to ask about the Powdery mildew asap.

I have got a dehumidifier, and It helped together with the h2o2. I have a humidity of about 20-30% right now and both the humidifier and my fans are running 24/7. What are "safers"?? I come from Denmark and dont know of any product by that name.

Calyxlover - Great to hear that! never tried it but been growing mtf for some grows now and wanted to try something else..(mtf is a wonderfull plant though). If you look closely at the first shot you can se that a tiny leaf right in the middle is covered with powder. I cant find a better shot cause I spray my plants every other day with h2o2. This seems to keep the mildew down. Ive taken some new shots of my mazar and some of the other plants as well. I think maby your right about that nuteburn, almost all of my plants leafs have changed color damaticly in the last 14 days.. some are becoming yellow and falls of, while others are becoming red to almost black. Take a look in my gallery and see what you mean. Do I feed to much nute? I thought I was giving them the right dossage.

I'm starting new plants up as we speak. Is my room infected for life? or can I prevent the new ones from getting the same shit? I'm thinking of the powdery mildew offcourse.

I never have problems with the "dew" and hope it stays that way. So I cant really help although I do know that those sulfur burners are supposed to be great for it.

the nutes tho def look like some burn. Advanced is potent shit and if ur feeding them almost every watering with any nute in a stronger dose flushing is key. Build up of unspent salts in the nutes linger and then all at once can really effect the ladies. Def give them a flush with water 3 times they're container size and then as soon as they're dry or close to it hit them up with normal fert dose. this should free up some of the intake and lock out probs and slove that nute burn. In soil I say a flush once a month will cover over ferting on a light to moderate level. A good flush cant hurt as long as nutes are replaced within a few days or so esp in the later bloom period. I just got a PPM meter and boy has it changed my life. Right down to the PPM or EC I can adjust my nute strength. No more guess work for me. Now I write down data and go over it to see what info I can get from it. Loving the truncheon meter

Also no room is every infected forever with anything bro. Stay calm and just do what you thinks right. PM is not gonna stop you from getttin killer nugs. Just another little issue to deal with. I solve one issue and two spring up. Its the way it is.

 

[DIGITALHIPPY]

that maz looked hot!!!
maybe a tad of nute burn, i didnt think it was a big deal. u dont seam to have much pm either....

"safers" is a brand they sell here in the usa... its organic and works on just about anything mj attracts, whiteflys, mites, fungis, incects...its cheap too.

h2o2 work ok. but it kills the beneficials and oxidizes leaf tissue eliminating the plants immune systems, essentialy handing it to the pm on a silver platter. maybe im being a bit extreme.

AN is good stuff i use it, u could do a foliar with 5-10ml barricade gal if u have it, not not on the label but the silicate gives the leafs a non-harmful coating and covers it from the PM.....i used alot of nutes on my girls last run too, im trying to do with way less this time... i find 1/2 what the label says is too much on occasions...
otherwise, nice plants, how many days? (sorry if repeat Q)

 

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Galxlover - At the moment I have not to much trouble with the powdery mildew. But if I end up having the same trouble with my new girls I might consider a sulfurburner. Dont know anything about this device though, it is not available here in Denmark, witch get me thinking.. does it fit danish electric plugs? here we use 230V.. Ill have to see when that time comes.

How do I flush when growing in soil and water everyother day? I give each plant about a half Liter of water. Should I feed them only water a week every month or so?
The last 3 watering I havent give them any nute.
I'm planing on going hydro after this grow, so the plan is to get some measurement instruments for the water. I was planing on measuring EC and pH. What are PPM?
Probably a noob question, I hope you will forgive me

Digital - Actually this is the smallest of my mazar. I have 2 and I think they are done within a week or so. My other plants have abot 14days to go I think. I will give them Ripen for a week and then a week with only water.

Maby I can find a dealer in the us that will ship to denmark, the problem is it usally take 3-5weeks to arrive because of customs. Anyways, safers sound like a nice produkt to have around when trouble is around. Ill chek it out.

I think I'm with you on cutting down on the nutes, it has to be build ups, cause it comes when i'm about half thru flowering.

 

[Bøf]

By the way, what du u guys think of using "Ripen" the last weeks of flowering if I have allready burnt my plants a little? Will it make it even worse? It says on the back of the bottle(I will translate from danish): "In case of earlier buildup of nutrients or microelements, Ripen will help the plants metabolic system by reducing theese nutes, and thereby increse the taste of the plant."
Sounds good enough, but it contains 6% Fosfor(P2o5), 5% Kalium (K2o), 2,5% Magnesium (Mg) and 2% sulfur (S)...

 

[Guest]

Galxlover - At the moment I have not to much trouble with the powdery mildew. But if I end up having the same trouble with my new girls I might consider a sulfurburner. Dont know anything about this device though, it is not available here in Denmark, witch get me thinking.. does it fit danish electric plugs? here we use 230V.. Ill have to see when that time comes.

How do I flush when growing in soil and water everyother day? I give each plant about a half Liter of water. Should I feed them only water a week every month or so?
The last 3 watering I havent give them any nute.
I'm planing on going hydro after this grow, so the plan is to get some measurement instruments for the water. I was planing on measuring EC and pH. What are PPM?
Probably a noob question, I hope you will forgive me

.

If its not bad then dont worry just keep the room CLEAN as can be with some good moving air and low hum. This will atleast keep it at bay. I have had some bugs on my genetics for prob like 2 yrs now but I keep them at larvae and egg stage at best. Once in awhile I do an Einstein oil spray and it kills anything alive and most eggs. I dont like chems so I bug bomb once in a long while when I'm between crops. Then CLEAN CLEAN CLEAN. Its just an issue I have and need to deal with. No biggie and they dont hurt the growth with proper maintence of the plants and room.

Ok onto watering and flushing. Take 3 times the plant container size(3 gal pot-9 gal water) and make it a week solution of bloom. Like just a fraction of a normal dose since you have no PPM(parts per million-same as EC in dif scale) and PH neutral to start on the 1st plant as a tester. Pour the entire batch of water through the soil catching the runoff at the end. test that PH to see if its close to 6.5(good). If its high at the end lower the PH of the flush water to counter act this. If low raise the PH of flush water. I PH my fulsh water to about 5 and at the end it is perfect. I have lime in my soil which helps PH stay up with lots of built up salts. Get a EC meter you'll love the power it gives you knowing exact numbers dude. I love mine. Then feed the plants a normal fert dose for the right week in flowering once dry or if you want a couple of days later but make sure it then dries out decently b4 next water/feeding. To avoid bugs and damp issues like hum spike.

Okay and watering/feeding. I prefer to fully soak the pot/bag I grow in so the roots spread evenly. Dry spots in the soil can kill roots already there or the roots wont spread evenly. Thick root balls are important to bud structure and MJ tends to have roots at the bottom cuz its a tap root plant. this is why proper pot/bag size and watering is important to maximize growth. that said I try to have my plants dry out completely and need another watering within 5 days. So I fully soak them then water/feed again in 5 days. I try to feed/feed/water/feed/flush and repeat. Thats about 30 days nuz flushing will take a few extra days to dry out again. Less constant work too and I have 40 ladies under 2600w for now soon to be 3200w. So I try to only have to do a larde hand watering every 5-6 days or so. Good results with this. I do a SOG with plants finishing at about 2 feet tall with 18 inches of bud. I get about 1.25-1.75 per clone vegged for about 3 weeks or so and supercropped and trained. Cant wait for XMAS. Hope this helps.

 

[Bøf]

I gues I have to have the oppertunity to let my water out in the bottom of my buckets, cause thats what I'm growing in. I gues its alot esier to flush in hydro. But get the Idea.

Ive stoppet with the feeding, exept for Ripen. But I think I will try to be more gentle with the feeding next grow. Also, your way of watering are completly different from mine. I water every other day, but I think your way makes point. If I were to grow in soil again I would try it out. Do you flush as often in hydro also? Or only when the plants says they need it?

Dudes I have to tell you. Thanx alot for the help so far, your knowledge is priceless.