![Page 1: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/1.jpg)
To Mix or Not to Mix: That is the Question?
(Tank-mixing Herbicides and Fungicides)
Eric P. Prostko
Extension Weed Specialist
Department of Crop & Soil Sciences
University of Georgia
![Page 2: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/2.jpg)
Why tank-mix agrochemicals?
• Advantages– Increase spectrum of control– decrease time and labor cost– less vine damage– decrease soil compaction
• Disadvantages– Reduced control– Increased crop injury– Physical incompatibility– different spray volumes/nozzle types– adjuvant recommendations
![Page 3: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/3.jpg)
Spray Volumes and Nozzle Tips
• What is the best water volume to use for ……..– fungicides– herbicides
• What is the best nozzle to use for….– fungicides– herbicides
![Page 4: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/4.jpg)
Nozzle Tips
Nozzle Tip
Herbicides Fungicides
Contact Systemic Contact Systemic
AI G E G E
Turbo Teejet
VG VG VG VG
XR
Flat Fan
E G E G
Turbo
Floodjet
NR VG NR VG
Whirl rain cone
VG VG E E
Hollow cone
NR G VG VG
![Page 5: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/5.jpg)
What happens when you mix chemicals?
• additive
* 1 + 1 = 2
• synergistic
* 1 + 1 = 3
• antagonistic
* 1 + 1 = 1 or less
![Page 6: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/6.jpg)
Antagonism
Gramoxone Max 8 ozs/A
Gramoxone Max10 ozs/A
+ Storm (1.5 pt/A)1 DAT
![Page 7: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/7.jpg)
What do the labels tell us?
• In most cases, not very much
• Unclear, vague, and confusing
• Trial and error• Has someone else
done it?
![Page 8: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/8.jpg)
Cadre Tank-Mixes
![Page 9: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/9.jpg)
Headline
MONCUT 70DFECHO® 720 AG
PropiMax* EC
Nichino America ARTISAN
![Page 10: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/10.jpg)
What have we learned?
• Generally no major problems but…..
• Impossible to test under all environmental scenarios
• There are some specific problems
![Page 11: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/11.jpg)
Annual Grasses and Select(Jordan et al. 2003. Peanut Science 30:1-7)
• More of a problem when applied in 25 GPA than if applied in 10 GPA
• % of comparisons where control was reduced– Kocide, ManKocide, Tenn-Cop = 80%
• 7-75% reductions in control– Bravo and others = 69%
• 2-60% reductions in control– Abound = 60%
• 5-13% reductions in control– Folicur and Tilt did not reduce efficacy
![Page 12: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/12.jpg)
Texas panicum control with Cadre/fungicide tank-mixes, 2002 (67 DAT) .
83 82 78 77 7367
75
0
20
40
60
80
100
None BravoWS
Tilt +BravoWS
Headline Abound Folicur Moncut
Fungicide
Con
trol
(%
)
LSD 0.05 = 20LSD 0.10 = 17
![Page 13: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/13.jpg)
A New Publication(For more specifics) • Tank Mixing Chemicals
Applied to Peanut Crops: Are the chemicals compatible?
• June 2004
• Regional publication housed at NCSU (AGW-653)
• Available on-line at: http://www.peanut.ncsu.edu/ag653.pdf
![Page 14: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/14.jpg)
New POST Labels for 2005
• Strongarm– 24c label in GA– No fungicide
tank-mix information
• Cobra
– Label says do not tank-mix
![Page 15: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/15.jpg)
Before spraying…..
• Read label• Water volume
compatible for both• Nozzle type• Contact county agent• Check for physical
compatibility– Jar test
![Page 16: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/16.jpg)
Mixing Order
• some water (1/2) + agitation• water soluble packets• wettable powder in slurry• DF or WDG• liquid flowables• EC• NIS/COC/AMS/UAN• Remaining water
(AMS then glyphosate)
![Page 17: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/17.jpg)
Two-Jar Test
• 1 pt of carrier (water) to each of 2 qt jars• ¼ teaspoon of compatibility agent to 1 jar
– Blendex (Helena)– Mix (Drexel)– Unite (Loveland)
• To each jar, add required amount of pesticide in order suggested previously. Shake well after each addition.
• After all have been added, shake for 15 seconds and let stand for 30 minutes
![Page 18: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/18.jpg)
Other issues
• Adjuvants– How is fungicide
formulated?– How bad are the
weeds?• What about …..
– insecticides– fertilizer– 3 or 4 way mixes
![Page 19: To Mix or Not to Mix: That is the Question? (Tank-mixing Herbicides and Fungicides) Eric P. Prostko Extension Weed Specialist Department of Crop & Soil](https://reader030.vdocuments.net/reader030/viewer/2022032800/56649d355503460f94a0c4a5/html5/thumbnails/19.jpg)
www.gaweed.com