Water volumes with fungicide - The Combine Forum
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post #1 of 20 (permalink) Old 07-02-2019, 10:19 PM Thread Starter
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Water volumes with fungicide

Just curious if anyone has any experience with lower water volumes and fungicides. Local spray plane sprays 2 gal/acre and charges a dollar more than ground which will spray up to 20 gal/acre reluctantly. I have used the plane in the past and it seems to work ok at 2 but i asked about spraying 4 gallons and rate almost doubled in price. I never done any trials but wondering if anyone else has and what your thoughts are. I usually hire the plane for some acres just to keep him around but i would still like to know if im getting value from the fungicide at the low rate?

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post #2 of 20 (permalink) Old 07-03-2019, 12:02 AM
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I spray my own fungicide with a ground rig but I try to let mother nature put the water on for me. If I can spray in a super dewey morning, then I cut back to 10 gpa. I use a good sticking agent like APSA 80 or Rainfast, so theres no runoff. If leaves are bone dry, then I go to 13-15, depending on field size. Have had good success so far

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post #3 of 20 (permalink) Old 07-03-2019, 12:10 AM
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I think with the plane the conditions are more important than the water volume. I wouldn't allow spraying in a hot or windy day but have had the plane spray some on a calm evening several years ago and it gave excellent coverage at probably similar water rates.

Having said that I do all my own spraying if possible, usually contact herbicides and fungicides at 9.2 GPA because that's 120 acres on the 1100 gallon tank. Usually run at close to 100PSI through air induction nozzles and the coverage is excellent. Again I will shut down mid-day if it's hot or windy.
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post #4 of 20 (permalink) Old 07-03-2019, 12:49 AM
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We spray most of our fungicide at 12.5 gallons a acre, which works out to 80 acres a fill.
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post #5 of 20 (permalink) Old 07-03-2019, 01:12 AM
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So if an air craft can get away with 2 gal why can’t we! I want to pick off a 3000 acre day!
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post #6 of 20 (permalink) Old 07-03-2019, 02:16 AM
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If you need penetration of the canopy with a fungicide like getting to the bottom of a lentil for anthracnose protection, then a ground rig with lots of water is the only way. I would take a high clearance any day over a plane unless it is too wet. Planes charge a lot for a poor job.
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post #7 of 20 (permalink) Old 07-03-2019, 02:35 AM
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Originally Posted by joesixpack View Post
So if an air craft can get away with 2 gal why canít we! I want to pick off a 3000 acre day!

Decrease your droplet size.
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post #8 of 20 (permalink) Old 07-03-2019, 03:06 AM
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Ok Iíll decrease my droplet size and then put twice as much on and then you argue weíre getting the same coverage!

But if I throw that all out:

18mph is pretty much my go to, 2gpa and a 640 acre fill is tempting.
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post #9 of 20 (permalink) Old 07-03-2019, 05:54 AM
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The plane can sometimes be your best coverage due to vortices created with speed and downdraft. There have been studies done to support this.

Sounds like low water volume, but I wouldn't bet against the plane doing as good or better of a job than a ground rig with 5 times the water volume.
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post #10 of 20 (permalink) Old 07-03-2019, 07:01 AM Thread Starter
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18mph is pretty much my go to, 2gpa and a 640 acre fill is tempting.
Apparently with roundup it works great...
With fungicide the jury is out...

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