Preventing Powdery Mildew

Discussion in 'Plant Problems' started by PharmaCan, Jan 1, 2008.

  1. PharmaCan

    PharmaCan Registered+

    I have a particular strain of mj that is a Master x Bubba hybrid. It's a really potent strain that I really like. The only problem is, it's highly susceptible to powdery mildew. I have six different strains of mother plants growing together in the mother cab. The MxB will get covered with powdery mildew while all the plants around it have none. I'm a couple weeks into veg on some plants that were cloned from the mother and I noticed yesterday that the leaves have a slightly dull patina to them - a sure sign that they are starting to develop powdery mildew.

    I have a sulphur burner, and I have Serenade, so I know how to treat the powdery mildew. My question is, does anyone know how to prevent it?

    I've been looking at Silica supplements. The propaganda says that silica helps strengthen cell walls. Would strengthening the cell walls make the plant less susceptible to powdery mildew?

    Anyone have any experience with this type of problem?

    PC :smokin:
  2. GaGrown

    GaGrown Registered+

    The only thing I know of is to keep the relative humidity down,around the plants. No standing water.The Serenade and Lilly Miller.You can even use neem oil to treat powdery mildew. Hope ya had a good New Years Eve!

    Ga Grown!
  3. Weedywildwoman

    Weedywildwoman Registered+

    Hi PharmaCan, in my Cervante's book it says to avoid powdery mildew you have to keep it well ventilated, well lit, and keep a low level of humidity. That's what I did with my two and they got it and died anyway. I even Serenaded (and not with my awful voice!) them once a week, but they were too sick. I'm sure you know all of that anyway and have all of those scenerios covered. I thought the way to keep it away was to sulphur bomb, but you already do that. Sorry I am not much help, I would love to see if someone knows the answer. Take care PhamaCan and Happy New Year! :stoned:
    • Like Like x 1
  4. stinkyattic

    stinkyattic CultiModerVatorAtor

    Another fine use for prophylactic neem oil treatment! Light mist, allow to dry, repeat a couple times a week, don't overdo it. Works FANTASTIC on rose bushes too. At Walmart and Home dePOT it's a product called 'fungicide 3'= neem.
  5. PharmaCan

    PharmaCan Registered+

    Weedywildwoman - Happy New Year to you too!!!

    Did you get a chance to try the MxB that Ken grew? If not, you should try some of it. Once you taste it, you'll feel differently about putting the effort into growing it. ...or maybe not. LOL I just know I like it.

    I hope you have good luck with the plants you just got! :thumbsup:

    PC :smokin:
  6. PharmaCan

    PharmaCan Registered+

    Stinky - Thank you! One of the main problems with anything foliar is that, with a scrog, there's a whole lot of vegetation that is tied down and scrunched together in an unholy mess and there's just no way to coat all the leaves. That's why I'm searching for something either systemic or environmental. (I way over-vegged on my first scrog, so maybe the growth isn't so dense when it's done properly but, still, there's going to be a lot of vegetation tied on top of other vegetation.)

    I hope you have a happy and prosperous 2008!!!

    PC :smokin:
  7. rhizome

    rhizome Registered+

    Heya PC- hope yer well.

    One of the big advantages of a thicker cell wall ( referring to another thread) is resistance to pathogens. The silica will boost yer plants immune system cross the board. Also makes it more difficult for sucking insects to pierce the wall (slowing them down), and for chewers to ,well, chew. Leonardite based silica supps are dirt cheap ( heh heh)- you should give one a shot. Silica Blast and Protekt work really well too.

    But really, air flow and humidity are the big factors- Can be a real b*tch in a scrog @ canopy level. Do you have a fan under the screen? Maybe a couple of wall fans just blowing straight up?

    Both the Serenade and the sulfur can be used preventatively.
  8. Opie Yutts

    Opie Yutts Registered+

    About getting under the canopy, if you want to go hi-tech you can get a fogger to spray an antifungal. It will drift everywhere, even to leaves that have only a tiny bit of air space.
  9. Opie Yutts

    Opie Yutts Registered+

    This sounds like just what you need. Found it when looking for the Spray and Grow rhizome recommended.

    Physan 20
  10. GDS StonerBoy

    GDS StonerBoy Registered+

    Opie it seems like you have found the miracle cure for just about any disease cannabis can get. Damping off?! I thought this was incurable?

    Even though i'm just a little skeptical i'm gonna get some tomorrow!

    Thanks for this find Opie!
  11. rhizome

    rhizome Registered+

    Hey guys- Look at the labeling on the Physan before you apply it to anything that yer gonna consume.
  12. Opie Yutts

    Opie Yutts Registered+

    rhizome, what are you trying to say?

    Physan 20 is extremely safe to use. It biodegrades within 50 hours. Physan 20 is EPA approved for use on tree fruit, ornamentals and hard surfaces.

    I saw this on the internet so it must be true. Could it be dangerous to smoke, I mean more than usual? How could it be safe on fruit from trees but not fruit from a weed plant? And if I let my weed grow to the size of trees, would it be ok to use on the fruit then?

    Bottom line is I've never heard of this stuff before and I have no idea what it will do, other than what rhizome and the manufacturer tells me. It just looked perfect for PCs condition so I thought I would throw it out there. Your welcome. It does look like some kind of miracle product, much like SubCulture and Liquid Light. If it sounds too good to be true than it probably is. So use some judgment and don't come crying to me when your children are born with psychic powers.
  13. Opie Yutts

    Opie Yutts Registered+

    Wait, I think I get it. The fruit guys wash their fruits before selling them, and the weed guys cant do that unless they're making hash. But if it biodegrades in 2 days, is there still residue or something that will remain until it is burned? Or what's the deal here? I want to understand.
  14. rhizome

    rhizome Registered+

    Physan is in fact awesome shit, but it's not approved for use on produce for consumption ( with the exception of tree fruits, and then only allowed by local law in a few states in the US- you folks do wash fruit before you eat it, right? ( Remarkable how much $ the WA Apple Growers Association has to throw around).

    That being said, I've never heard of any health problems from the stuff, and I've been around a lot of it. Almost assuredly safer than smoking, say, Floramite- and you'd be hard pressed to find mid-grade commercial indoor that hasn't been hit w/ Floramite, so I'm gonna say no more dangerous than normal.

    Phytotoxicity may be more of an issue, but you should always test that for yourself.

    I dunno- I'd hate to see folks using Physan as a fix for ventilation problems. I don't think it's gonna hurt anybody ( well- don't spray yer eyes) but I don't really think of it as a "first-line" treatment- I'd hold it back for real issues.

    It is, though, the very best thing ever for sterilizing surfaces ( like everything in the room) between crops, and I've seen it work wonders on powdery mildew in rose houses ( our local rose grower uses a 55 g drum every winter- just never eaten ( or smoked) any that I know of. Odds are, though, that I've eaten and smoked a bunch that I didn't know of...(cough).

    I didn't say it shouldn't be used- I just hope folks read the labeling ( including msds) before they start throwing it around.

    And please please please be careful about how you dispose of any excess- this stuff'll kill a septic system dead.

    My child was born w/ psychic powers- she somehow knows when I'm just about to lose it and vanishes, only to re-appear when I've calmed down. Quite remarkable really.
  15. Opie Yutts

    Opie Yutts Registered+

    Wow, the way you describe it, it does sound quite a bit more dangerous than I had previously been thinking. Maybe it was the septic thing that got me. I really don't want that harmed. We have too much clay and I had to make a cap and fill. A total pain in the ass. Well thanks a bunch for the heads up. Who knows, you may have even just saved a life or two. That's great to hear about your child. At age 4 he still has chosen not to tell us what his powers are.
  16. rhizome

    rhizome Registered+

    Really, I wouldn't call it dangerous-

    I'm just a big subscriber to the " least toxic intervention first, then escalate" theory- and Physan isn't close to the least toxic management technique for mildew.

    Just sayin'.
  17. Weedywildwoman

    Weedywildwoman Registered+

    Thank you PharmaCan! I wish I had the cash to get some of Ken's MxB, I just have enough for the clones. I did get a bit from my two and it was very nice! :D I wish I had ordered a couple of them. I haven't gotten the clones yet as he is going to find time to come to me. I think it is so nice of him to offer to bring them to my house, as I live up the hill. I'm sure I will hear from him soon about the order. The weather has been so crappy here, probably down there too. I wouldn't want him to come up here in this stormy stuff. I think I need to add a couple of MxB to my order! :D I don't want to bother him though.
    Sorry I rattled on... I hope your plants are looking healthier. :smokin:
  18. Opie Yutts

    Opie Yutts Registered+

    Hey that does sound like a pretty good guide to go by. I have to wonder if it's even better than my "I want the most harmful, dangerous shit you can sell me" theory.
  19. stinkyattic

    stinkyattic CultiModerVatorAtor

    Oh shit... every time I hear those two words together I end up doing something about a month later I never had planned on... like coco! or hydro! or *GASP* p-p-p-p-p-promix....
    (sticks fingers in ears and yells LA LA LA and scurries off to a safer location)
  20. Opie Yutts

    Opie Yutts Registered+

    Whatsamatter? Can't handle people just sayin stuff, huh?

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