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Mixing dry Fungicides

Discussion in 'Pesticide & Herbicide Application' started by kirk1701, Apr 18, 2012.

  1. kirk1701

    kirk1701 LawnSite Gold Member
    Messages: 3,981

    Hey Everyone

    I'm spraying fruit tree's and one of the fungicides I'm told I need from the contact I've been working with at the Dept. of Horticulture is Captan 50W to go along with Immunox.

    I have the captan but it's stayed on a shelf due to laziness I admit it :confused: and not knowing how to mix this stuff because its powder and mixed by weight. Plus, the labels all go off mixing 2 to 300 gallon at a time.

    Ok, here's the label the guy sent me:

    And here's a link he sent to mix different herbicides, insecticides and fungicides but even this gets confusing

    I just need to know how to go about getting how much product per 1 gallon?

  2. Think Green

    Think Green LawnSite Silver Member
    Messages: 2,746

    You need to know how much product you are needing.....lets say per acre. Lets say you intend on spraying an acres worth of foliage or whatever. The product is 50W, so take the number want to apply X 100 / 50 (Should be 2 lbs. per acre in how ever much water you apply) This is figuring in 1 lb. of product per acre to. You can substitute what the label says instead of 1`. Most of my products indicate x amount of lbs. per 100 gallons of water.
  3. kirk1701

    kirk1701 LawnSite Gold Member
    Messages: 3,981

    Ok 4 to 8 Lbs per acre is what I see so but don't see how you arive at a number of ounces which is has to be per gallon Think Green?

    I'd go with the 4 or 5 Lbs per acre I guess.
  4. all things green

    all things green LawnSite Member
    Messages: 23

    16 0z. in a lb buddy...do the math.....base it off of a hundred gallons....if it is 6 lbs / 100 gal.....then take 6lbs x 16 oz.....and that will tell you how many total ounces there are in 100 gal.....then you can do the math and figure it out to the gallon...basic stuff you should know if you have a liscence...just saying.....
  5. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,721

    I suggest use the directions for dichondra in California. That is, 3.2 ounces in one gallon of water.

    Or assume your tree is 10 by 10 feet, a hundred sqft
    Divide by 43,560 to get .00229 of an acre
    Times 8 pounds to get.0183 lbs
    Times 16 to get .2938 ounces Captan per 100 sqft. (Suited for small tree). Or...
    That would be about 2.938 ounces per 1000 sqft. (Suited for bigger tree, and about one gallon of water.)
  6. kirk1701

    kirk1701 LawnSite Gold Member
    Messages: 3,981

    Thanks Riggle, I don't understand the math but trust your's and your judgement [​IMG]

    I sprayed today but it was way way off, 3 tablespoons to 4 gallon of water. I'll adjust in two weeks to your 3.2 ounces/gallon
  7. kirk1701

    kirk1701 LawnSite Gold Member
    Messages: 3,981

    It was late when I replied and didn't catch the "ounces" is that by weight? Because this stuff is a powder :rolleyes:
  8. Yatt

    Yatt LawnSite Member
    Messages: 203

    I mix 30 gallons of spray for my orchard at a time. For this amount I use 1/2 # of Captan for a contact fungicide and 1 1/3 oz of Ralley. For bugs 1/2 # of Imidan.

    8 oz of Li-700 as a surfactant and acidificant/buffering agent, (we have high ph and this combats hydrolisis.

    Since I have Honey crisp, 1/2 gallon of a 10% calcium supplement which they need to combat bitter pit.
  9. Think Green

    Think Green LawnSite Silver Member
    Messages: 2,746


    you have multiply by to get.
    lb/acre .367 oz/1000 ft2
    lb/acre .023 #1000 ft2
    lb/acre .0023 #100 ft2
    lb/acre .0306 x width oz/1000 ft
  10. kirk1701

    kirk1701 LawnSite Gold Member
    Messages: 3,981

    Thanks Think Green
    The guy from University of Kentucky, Dept. of Horticulture called me tonight and got the info I need. As I've said its a powder and converting this from weight to tablespoons per gallon seems to be the headache.

    For Apples, Peaches and Cherries: 4-8 Lbs /acre equals 1.6 to 3.3 tablespoons /gallon.

    Sorry but the math is a bit over my head, I'm sure if it was explained to me I'd understand. Like Lbs/1000 or Gal/1000 I get and given a number of ounces per gallon I get, but converting it to dry weight and all this 40 gallon to 1 cup ;) and the math we'll :cry:

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