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Tankmix
applications have possible advantages and disadvantages.
It may be possible to:
• Increase the spectrum of pest control
• Decrease time and cost of labor
• Lessen vine damage
• Lessen damage to the soil due to compaction.
Avoid
these possible disadvantages:
• Reduced control
• Increased crop injury due to phytotoxicity
• Physical incompatibility of chemicals to be applied
• Different spray volumes or adjuvant recommendations for
components.
Be
aware of legal issues when tankmixing agrichemicals:
• The label is the law. If the mix is not permitted, do not
use it.
• Always follow the more restrictive label. Remember that
manufacturers will not guarantee product performance if the chemical
is used in a way other than described on the label.
To
overcome incompatibility:
• Increase the rate of application for a chemical
• Use or change an adjuvant
• Change a spray volume.
When
tankmixing chemicals, add products in the following order unless
otherwise directed on the product label:
1. Small amount of water, and begin agitation
2. Water-soluble packets
3. Wettable powders as a slurry
4. Dry flowables or water-dispersible granules
5. Liquid flowables
6. Emulsifiable concentrates (oil concentrates)
7. Remaining water
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Managing pests is critical in optimizing peanut yield and
quality. Applying combinations of agrichemicals is an efficient practice
with known benefits. Producers may reduce the cost of pest management
by limiting trips across the field. Fewer passes across a field is not
only more convenient, it also reduces vine damage and has the potential
to increase control of particular pests and broaden the spectrum of pests
controlled.
But tankmixing of agrichemicals has difficulties and disadvantages.
Chemicals may be physically and/or biologically incompatible. Adjuvant
and spray volume recommendations may differ. Certain combinations may
actually reduce pest control or increase plant damage due to phytotoxicity.
To choose an effective tank mixture, begin with the product
label. The label is the law. Product labels provide federal regulations
concerning tank mixing; always follow the more restrictive label.
While farmers may legally tankmix any chemicals as long as
no product label restricts tankmixing, certain tank mixtures can cause
the peanut crop to suffer. Product labels do warn about some potential
problems, but they do not clearly address other issues. And manufacturers
do not guarantee product performance when their chemicals are used in
ways other than described on the label.
Peanut producers are most likely to apply combinations of
herbicides, fungicides, insecticides, plant growth regulators and/or foliar
fertilizers. To make these combinations work, a producer needs to be able
to predict unfavorable interactions. The tables that follow on pages 14
and 15 outline some of the problems that have occurred with tankmixes
applied in research trials conducted by universities in the peanut belt
of the United States.
Editor’s Note: The information presented here is
only part of the information bulletin: Tankmixing Chemicals Applied To
Peanut Crops: Are The Chemicals Compatible from the North Carolina State
University Cooperative Extension Service. To view the entire bulletin,
go to their Web site at www.peanut.ncsu.edu/ag653_web.pdf.
| Compatibility
Of Postemergence Herbicides With Fungicides Applied To Peanut* |
| Herbicide |
Weed
Species |
Fungicides
That Did Reduce Weed Control |
Fungicides
That Did Not Reduce Weed Control |
Arrow
with crop
oil concentrate |
Broadleaf
signalgrass |
Bravo
Weather Stik, Headline |
Folicur |
| Large
crabgrass |
Bravo
Weather Stik, Headline |
Folicur |
| Texas
Panicum |
Bravo
Weather Stik |
Folicur,
Headline |
Basagran
with
nonionic surfactant
(80/20 blend) |
Yellow
nutsedge |
Bravo
Weather Stik plus Tilt, Kocide, ManKocide |
Abound,
Folicur, Dithane F-45, Omega 500, Tilt, Stratego |
Blazer
with
nonionic surfactant
(80/20 blend) |
Smooth
pigweed |
Folicur,
Kocide |
Abound,
Bravo Ultrex, Bravo Weather Stik, Bravo Weather Stik plus Tilt, ManKocide,
Omega 500, Tilt |
Butyrac
200
adjuvant** |
Entireleaf
morningglory |
|
Abound,
Bravo Weather Stik, Endura, without Headline, Omega 500, Stratego |
| Sicklepod |
Abound,
Bravo Ultrex, Folicur, Kocide, ManKocide |
Bravo
Weather Stik, Echo, Headline |
| Smooth
pigweed |
Abound,
Bravo Ultrex, Bravo Weather Stik, Folicur, Kocide, ManKocide, Omega
500, Rovral, Tilt/Bravo |
Echo,
Rovral |
| Tall
morningglory |
|
Abound,
Bravo Weather Stik, Folicur,
Headline |
Cadre
with
nonionic surfactant
(80/20 blend) |
Broadleaf
signalgrass |
|
Abound,
Bravo Weather Stik, Folicur, Headline |
| Large
crabgrass |
|
Abound,
Bravo Weather Stik, Folicur, Headline |
| Texas
panicum |
Folicur |
Abound,
Bravo Weather Stik, Headline,
Moncut, Tilt/Bravo |
| Sicklepod |
|
Abound,
Bravo Weather Stik, Folicur,
Headline, Moncut, Tilt/Bravo |
| Yellow
nutsedge |
|
Abound,
Artisan, Bravo Weather Stik, Folicur, Headline, Moncut, Tilt/Bravo,
Stratego |
Cobra
with
nonionic surfactant
(80-20 blend) |
Redroot
pigweed |
|
Bravo
Weather Stik, Headline, |
| Asana
XL, Karate Z |
| Entireleaf
morningglory |
|
Bravo
Weather Stik, Headline, |
| Asana
XL, Karate Z |
| Spurred
anoda |
Headline |
Bravo
Weather Stik, |
| Asana
XL |
Karate
Z |
| Eclipta |
|
Bravo
WeatherStik, |
| Asana
XL, Karate Z |
Poast
with crop
oil concentrate |
Broadleaf
signalgrass |
|
Abound,
Bravo Weather Stik, Folicur, Headline |
| Large
crabgrass |
Abound,
Artisan, Bravo Weather Stik,
Folicur, Headline |
Endura,
Omega 500, Stratego |
| Texas
panicum |
|
Abound,
Bravo Weather Stik, Folicur,
Headline |
Pursuit
with
nonionic surfactant
(80/20 blend) |
Smooth
pigweed |
Kocide,
ManKocide, Omega 500 |
Abound,
Bravo Ultrex, Bravo Weather Stik, Bravo Weather Stik plus Tilt, Dithane
F-45, Folicur, Tilt, Tilt plus Montero, Tilt plus Stratego |
|
Compatibility
Of Postemergence Herbicides With Fungicides Applied To Peanut (continued)* |
| Herbicide |
Weed
Species |
Fungicides
That Did Reduce Weed Control |
Fungicides
That Did Not Reduce Weed Control |
Select
with
crop oil concentrate |
Broadleaf
signalgrass |
|
Bravo
Ultrex, Bravo Weather Stik, Bravo
Weather Stik plus Tilt, Folicur, Omega 500, Tilt |
| Goosegrass |
Bravo
Weather Stik, Bravo Ultrex,
Bravo Weather Stik plus |
Folicur,
Omega 500, Tilt |
| Large
crabgrass |
Abound,
Artisan, Endura, Bravo Weather Stik, Folicur, Headline, Kocide, ManKocide |
Omega
500, Stratego |
| Texas
panicum |
Abound,
Bravo Weather Stik, Bravo Ultrex, Bravo Weather Stik plus Tilt, Echo,
Kocide, ManKocide, Tilt plus Montero |
Dithane
F-45, Folicur, Omega 500, Tilt plus Stratego |
Strongarm
with
nonionic surfactant
(80/20 blend) |
Common
ragweed |
Abound,
Bravo Weather Stik, Folicur, Headline |
|
| Morningglory |
|
Abound,
Bravo WeatherStik, Folicur,
Headline |
| Florida
beggarweed |
Headline |
Abound,
Bravo WeatherStik, Folicur |
*
Some products may no longer be in use or may have different trade
names, but since they were used in the experiment, they are included
in the table.
Results are from replicated university trials conducted in Georgia,
Florida, North Carolina and Texas. Compatibility of Butyrac 200, Poast
and Select with fungicides has been evaluated more extensively than
compatibility of fungicides with Basagran, Blazer, Cadre and Pursuit.
Agrichemicals were applied with small-plot spray equipment with ample
agitation (shaking) to keep solutions thoroughly mixed. Product labels
that prohibit mixing agrichemicals supersede this table. Physical
compatibility of some mixtures may be an issue. |
|
Compatibility
Of Postemergence Herbicides With Other Herbicides, Foliar Fertilizers
And Plant Growth Regulators Applied To Peanuts* |
| Herbicide** |
Products
That Did Reduce
Weed Control |
Products
That Did Not Reduce
Weed Control |
Arrow
with crop
oil concentrate |
Cadre,
Storm |
|
Butyrac
200 without
adjuvant *** |
|
Boron
Xtra, Karate Z, Manganese Xtra, Solubor, Techmangum |
Poast
with crop
oil concentrate |
2,4-DB,
Basagran, Blazer, Butyrac 200, Dual, Pursuit, Storm |
Apogee,
Karate Z, Outlook, Solubor |
Pursuit
with
nonionic surfactant
(80/20 blend) |
Basagran |
Boron
Xtra, Manganese Xtra, Solubor, Techmangum |
Select
with crop
oil concentrate |
2,4-DB,
Basagran, Blazer, Cadre, Pursuit, Storm |
Apogee,
Boron Xtra, Karate Z, Manganese Xtra, Solubor, Techmangum |
*Results
are from replicated university trials and scientific literature. Compatibility
of some combinations has been evaluated more extensively than compatibility
of others. Product labels that prohibit mixing agrichemicals supersede
this table. **Combinations of broadleaf/sedge herbicides often control
a wider spectrum of weeds than either herbicide applied alone. See
Peanut Information, AG-331, for effectiveness of such tank mixtures.***Farmers
and commercial applicators have observed physical incompatibility
(settling in spray tank) when 2,4-DB (several formulations) is mixed
with manganese-containing products. In the university trials reported
here, the herbicide solution was constantly agitated to prevent settling.
Source: Tankmixing Chemicals Applied To Peanut Crops: Are The
Chemicals Compatible from the North Carolina State University
Cooperative Extension Service. To view the entire bulletin, go www.
peanut.ncsu.edu/ag653_web.pdf. Always read and follow label directions
with any chemical product.
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