May/June 2019 - 27
* Incorporate all preemergence-applied herbicides as soon
after application as possible to activate the herbicide. If
applied by ground, rain or sprinkler irrigation must occur for
incorporation and activation in the top two-inch layer of soil
where most weed seeds germinate.
* Example of Outlook + Linex applied in this scenario is shown
in Figure 4.
Preemergence-only herbicides for Scenario 2
Dimethenamid-p (Outlook)
Ethalfluralin (Sonalan)
Flumioxazin (Chateau)
- Chateau should be applied as early as possible after planting
because at least 2 inches of settled soil covering the potato
sprouts at application (and incorporation) time is required.
Fomesafen (Reflex)
- For use in potatoes grown with overhead irrigation, only.
- Only for use in Idaho, Washington and Oregon with Special
Local Needs 24 (c) labeling. Check your state for labels and
label expiration dates.
Trifluralin (Treflan and others)
- Linuron (Linex or Lorox and other trade names)Linex has
some activity on emerged weeds, however, must be applied
before potato emergence to avoid injury.
- For Linex on potatoes grown west of the Rocky Mountains:
Idaho, Washington and Oregon currently have Special Local
Needs 24 (c) labels. Check your state for label expiration dates
and other restrictions.
Sulfentrazone (Willowood Sulfentrazone 4SC and others)
- Caution: highly mobile in soils with pH of 7.5 or greater
and/or sprinkler incorporation with highly alkaline water,
especially if soil is also coarse-textured, may increase the
amount of herbicide available in the soil solution - good
for weed control, however, increased availability could cause
crop injury. Use the lowest rate for your soil texture and pH.
A formulated pre-mix of sulfentrazone and metribuzin
(Willowood MTZ 4SC)
Subsequent postemergence herbicide application
may be necessary
Scenario 1 may need a second postemergence herbicide
application. Scenario 2 might need a postemergence herbicide
application in addition to the preemergence application because
of heavy weed pressure, late-germinating weeds, and/or the first
application did not have activity on certain weed species.
* Matrix and/or metribuzin are commonly used in this instance
since they can be applied postemergence to the potatoes and
have activity on emerged weeds.
* Timing in relation to weed size and herbicide choice is
extremely important. Example of metribuzin applied
postemergence pictured in Figure 5 (previous page).
Sprout-Stop
Liquid Growth Retardant
Making the Grade
~Since 1972~
Chlorothalonil 720
Fungicide
Phiticide™
Fungicide
®
For additional information
please visit DrexChem.com
PHITICIDE, SPROUT-STOP and the DREXEL logo are either
trademarks or registered trademarks of Drexel Chemical Company.
Always read and follow label instructions on the product container(s)
before using.
SPUDMANAD2-0118
Spudman * May/June 2019
27
u.s. no. 1
http://www.DrexChem.com
May/June 2019
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