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Powdery Mildew - Large scale Greenhouse

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    Powdery Mildew - Large scale Greenhouse

    Hi Everyone,

    I am new to ICMag but am happy to finally be here!

    I work at a 300,000 square foot greenhouse in southern Ontario Canada. It is poly. 150 feet long by 100 feet wide and 30 feet tall.

    I am an internal consultant on the greenhouse and am not apart of the grow team. I have been indoor growing for about 6 years now and had great success. I was hoping to get some feedback/advice.

    We have been struggling to control Powdery Mildew and am looking for some advice. In terms of air exchange, it is limited. The greenhouse sits around 23 degrees Celsius and humidity is pretty high. All of this is bad for PM lol

    Does anyone have any suggestions to help control and reduce the around of PM we are experiencing? We are limited on fungicidal control methods due to regulations.

    #2
    Solving the conditions that caused it to manifest would probably be your best bet. I'm not trying to be cute when I say that, it's just that with limited control methods at your disposal it's likely to happen again unless you can trend the environment away from inviting it. If you could manage that, perhaps the approved options would be more viable.

    Comment


      #3
      What he said^^

      If you can neither solve your air circulation issues or use anti-PM chemicals, you're fucked unless you switch to PM resisting strains.
      "I smoke mad weed around the clock all the time,
      it's the only thing that keeps me from losing my mind!"

      First World







      "Flowers everywhere is what he sees, because he is one of Shiva's devotees"

      Comment


        #4
        To control powdery mildew the environment needs controlling, can’t have the big temp and humidity swings.

        UC Davis has a nice risk indication model that assesses points for certain conditions, x number of days at a certain temp and humidity will initiate outbreaks generally speaking.
        It’s mostly about grape production but would apply to other plants.


        www.ipm.ucanr.edu/PMG/r302100311.html

        Comment


          #5
          Originally posted by Cannama View Post
          Hi Everyone,

          I am new to ICMag but am happy to finally be here!

          I work at a 300,000 square foot greenhouse in southern Ontario Canada. It is poly. 150 feet long by 100 feet wide and 30 feet tall.

          I am an internal consultant on the greenhouse and am not apart of the grow team. I have been indoor growing for about 6 years now and had great success. I was hoping to get some feedback/advice.

          We have been struggling to control Powdery Mildew and am looking for some advice. In terms of air exchange, it is limited. The greenhouse sits around 23 degrees Celsius and humidity is pretty high. All of this is bad for PM lol

          Does anyone have any suggestions to help control and reduce the around of PM we are experiencing? We are limited on fungicidal control methods due to regulations.
          What are the highs and lows of humidity and temperature over 24 hours? The temperature is good.
          OH IF A MAN TRIED
          TO TAKE HIS TIME ON EARTH
          AND PROVE WHAT A MAN IS WORTH
          I WONDER WHAT WOULD HAPPEN
          TO THIS WORLD

          -Harry Forster Chapins' Tombstone

          Comment


            #6
            Temperature ranges are about 18 at lowest and 26 at highest.
            RH can swing drastically from 45-75%.

            I am recommending that we invest in good climate control but that can take awhile...lol
            We do have a super lemon haze pheno which is really resistant. But resistance can only go so far no?

            Thanks everyone for your replies

            Comment


              #7
              Depends what you mean by really resistant. In my experience some strains or some phenos of a specific strain are litteraly immune to PM,no matter what( but they may be suceptible to others kinds of mold).
              "I smoke mad weed around the clock all the time,
              it's the only thing that keeps me from losing my mind!"

              First World







              "Flowers everywhere is what he sees, because he is one of Shiva's devotees"

              Comment


                #8
                It is beside a pheno of master kush which is absolutely caked lol and it has 2 spots on the whole plant

                Comment


                  #9
                  300,000 sq ft grow consultant, has to come ask a bunch of hobby growers how to run their operation... (which is really 15,000 sq ft because cubic measurements are a different thing)

                  Perhaps if they hired experts in the first place, instead of trying to penny pinch and hire a basic labor force there wouldn't be powdery mildew issues.

                  Sorry. I have no pity on those who are in the game for purely capitalist objectives. You want answers? You should perhaps, HIRE A RISK MANAGEMENT CONSULTANT -oh wait, that's supposed to be you.

                  Seems to me this post is more about you saving face and your job.



                  dank.Frank
                  Bunch of fake ass neo-capitalists masquerading
                  as counter
                  culture cannabis enthusiasts with
                  their thinly veiled
                  self-justifications
                  catering to the morally
                  ambiguous
                  for the sake of the
                  ALL MIGHTY DOLLAR

                  Canna Caramels ---> click here Organic Soil ---> click here Current Grow --> click here

                  Comment


                    #10
                    Originally posted by Cannama View Post
                    Hi Everyone,

                    I am new to ICMag but am happy to finally be here!

                    I work at a 300,000 square foot greenhouse in southern Ontario Canada. It is poly. 150 feet long by 100 feet wide and 30 feet tall.

                    I am an internal consultant on the greenhouse and am not apart of the grow team. I have been indoor growing for about 6 years now and had great success. I was hoping to get some feedback/advice.

                    We have been struggling to control Powdery Mildew and am looking for some advice. In terms of air exchange, it is limited. The greenhouse sits around 23 degrees Celsius and humidity is pretty high. All of this is bad for PM lol

                    Does anyone have any suggestions to help control and reduce the around of PM we are experiencing? We are limited on fungicidal control methods due to regulations.
                    BURN THE GOD DAMN PLACE DOWN.

                    How come they hired you and you cannot handle the problem.

                    Thats what these LAME LPS GET.

                    Lightgreen2k from IG.

                    Lightgreen2k on rollitup too

                    Comment


                      #11
                      Originally posted by Cannama View Post
                      It is beside a pheno of master kush which is absolutely caked lol and it has 2 spots on the whole plant
                      Which LP are you.. not tweed, you are one of the smaller ones.

                      Why dont you know this information

                      @theloudreserve and I where just talking about all the bullshit strains at the lps.

                      Tell your boss he can get some real growers at 100k
                      Or lose 1 million upwards.

                      You will be wiped out totally in two harvest. They thought weed was like growing corn

                      Fuck it man.
                      Powdery Mildew is the next worse thing to Russet Mites.

                      Comment


                        #12
                        Lots of knowledge in Leamington on greenhouse climate control. It's not so much about air exchange that causes mildew. The swings in your humidity are the biggest problem, exhaust fans only offer so much, vents help more in conjunction with heat to keep a more stable humidity level. Indoor versus greenhouse are vastly different in the mindset of growers I have talked to, indoor is a complete joke if you try to do it in a greenhouse.

                        Circulation fans are needed HAF to maintain a more even temperature and humidity profile. If you have vents you shut off your haf fans when open roughly 15% to save electricity as the air doesn't get circulated enough. Try putting out different thermometers or hobo sensors etc to see different spots in the greenhouse and different heights as well. This will help you asses your temperature profile and humidity profiles. Drafts can cause mildew to go like wildfire, dewpoint does as well. I have a strong suspicion that you have a very uneven climate in your 'greenhouse'.

                        There are crop advisors out there that help businesses out but if you don't know how to run a commercial greenhouse you can't just pick it up over night.
                        Your best you try, to harm I and I, Aiming to kill.
                        But I love you still Cause you are here to make prophecy fulfill.

                        Comment


                          #13
                          posts like this blow my mind. I know I'm not being helpful but damn.

                          Comment


                            #14
                            suprised you have high RH during winter its usually pretty dry..
                            increase temps at night, have air circulation HAF, spraying water during daytime can wash some mildew off, burn sulfur if youre allowed.

                            You could also get dehumidifiers, all those purpose built ones are pretty expensive, but you could convert old watercooled 5tons ac into dehumidifiers for cheap if you have them...

                            did you guys get budrot last summer ? heard nothing but bad things from greenhouse growers in ontario in the last years.

                            Comment


                              #15
                              i currently run a 10k sqft glass greenhouse in canada and I can tell you greenhouses are a nightmare for indoors growers.

                              during winter;
                              -heating is expensive
                              -light is very low
                              -sunlight dosent get to the plants (sun is too low or too much obstacle)
                              -equipments are more expensive and complex

                              during summer (light dep or full season)
                              -you get bud rot !!! (or invest a lot of money for dehumidifier)
                              -Eastern canada is humid
                              -difficult to lower temperature

                              on top of all these extra issue you still deal with what you would deal with indoors.
                              I thought greenhouse would run cheaper but end up be more expensive and the final product isnt that nice compared to indoor, since you cant really control your environement proprely.. pretty pointless IMO

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