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ISSUE 3  MAY 20, 1999

RETALIATION AGAINST HERBICIDE TELEMARKETERS

    Telemarketers are out in full force selling high priced herbicides that contain very little active
ingredient, and claiming these herbicides can do unbelievable things. We need your help to shut these
people down. The ND Dept of Ag has indicated that with proper documentation of phone call
conversation they can take action against companies that use this approach to rip_off growers of their
hard earned money.

    For example, reports have been made of a chemical company selling a product containing 2,4_D and
bromacil (Hyvar) at a total concentration of 2% ai for $90/gal + $21 freight. By my calculations, the
grower is spending the equivalent of: $3,961.76 for a gallon of 2,4_D LV4 and $2,610.33 for a gallon
of Hyvar X_L.

    In North Dakota, an average price for 2,4_D LV4 is $14 per gallon and $55 per gallon for
Hyvar X_L (2 lb/gal). They are selling this herbicide for 47 times and 283 times the cost than if
the grower were to buy the 2,4_D LV4 and Hyvar X_L from his dealer.

    Absurd claims are made with these products. For instance, one application of a product called
Triple Threat (three phenoxy herbicides at a total of 1 lb/gal) was report by the telemarketer to
control leafy spurge for 5 years. Do you think the telemarketer would sign his name to the
guaranty - NOT!

Get the following information during the phone call - if you can:

1. Name of product and telemarketer.

2. EPA registration number of product.

3. Formulation and concentration of active ingredients.

4. Name, address, and phone number of company.

5. All claims made by telemarketer.

6. Any other information that would be useful to fry these vermin ("the most pernicious race of little
odious vermin that nature ever suffered to crawl upon the face of this earth (Swift)).

    We need your help to rid our state of this pillage. Please document the call and report to the
ND Dept of Ag at 701 328-1501. When calling the Dept of Ag ask if the product is registered
in the state. If it is not registered, it is a good indication its ‘scam brew’.

Richard Zollinger
NDSU Extension Weed Specialist
rzolling@ndsuext.nodak.edu

 

HERBICIDE CARRYOVER

    Authority is a new herbicide registered on soybean. Spartan has received a Section 18 registration
for kochia control in sunflower produced with conservation tillage. Sulfentrazone is the active ingredient
in both Authority and Spartan. Sulfentrazone was applied at 0.375 lb ai/A or 0.5 lb product/A at Fargo
in 1996. Sugarbeet seeded in 1997 on those plots had 98% injury and sugarbeet seeded in 1998 had
43% injury. Sugarbeet will be seeded again in 1999 to see if the sulfentrazone is gone. Canola seeded
in 1997 on the plots treated with sulfentrazone in 1996 had 19% injury so canola is more tolerant of
sulfentrazone then sugarbeet. Wheat, barley, sunflower, navy bean and corn were not injured in 1997
by sulfentrazone applied in 1996. The Authority and Spartan labels indicate a recropping interval of 24
months for canola and sugarbeet. This should be long enough for canola but may not be long enough for
sugarbeet. At a minimum, plan to skip the year of application and two more years before planting
sugarbeet. Results in 1999 will determine if even more time is needed.

    FirstRate (cloransulam) applied in 1996 at 0.031 lb ai/A or 0.6 oz product/A at Fargo caused
significant injury to sugarbeet, wheat, barley, canola, sunflower, navy bean and corn seeded in 1997.
This rate is for PRE or PPI application and double the POST rate. Sugarbeet will be seeded again in
the plots in 1999. Sugarbeet seeded in 1998 on plots treated with First Rate in 1996 had 32% injury.
Sugarbeet will be seeded again in the plots in 1999. The rotation interval for sugarbeet on the FirstRate
label is 30 months plus a successful field bioassay.

    Classic (chlorimuron) is not registered for use in North Dakota but it is registered in parts of Minnesota.
Classic, nor any product containing Classic (Synchrony, Reliance)are not registered in North Dakota
and some parts of Minnesota at least partly because of its long soil residual. Classic applied in 1990 at
0.008 lb ai/A or 0.5 oz product/A at Fargo caused 98%, 83%, 100%, 14% and 5% injury to sugarbeet
seeded in 1991, 1992, 1993, 1994 and 1995, respectively. Classic applied in 1990 at 0.004 lb ai/A or
0.25 oz product/A at Fargo gave 93%, 62%, 83%, 0% injury to sugarbeet seeded in 1991, 1992, 1993,
1994, and 1995, respectively. So, even at the low 0.25 oz/A rate, sugarbeet could not be seeded until
after the year of application plus three more years. The higher rate would require one more year. The Fargo
site has a soil pH of about 8.0. Classic would have less carryover on soils with a lower pH but a successful
field bioassay must be completed before seeding sugarbeet into a field that has been treated with Classic.

    Balance (isoxaflutole) is registered for weed control in corn North Dakota but not in Minnesota.
Balance applied in 1996 at 0.14 lb ai/A or 3 oz product/A at Fargo caused significant injury to sugarbeet,
canola, sunflower and navy bean seeded in 1997. No sugarbeet injury was observed in1998 from
Balance applied in 1996. The highest rate of Balance suggested for North Dakota is 2 oz. product/A
so the rate used in 1996 is labeled but is higher than the normal use rate. Another experiment with
Balance carryover was started in 1998.

 

NOZZLES FOR BAND SPRAYING

    Sugarbeet growers typically have used 40 degree even-spray flat-fan nozzles for applying a 7-inch
wide band in sugarbeet. Some growers have chosen to use a hollow cone nozzle with a 45 degree spray
angle. The advantage of the even-spray nozzle is better uniformity of the spray pattern across the band
since the hollow cone nozzle applies more spray at the edge of the pattern and less in the middle. The
advantage of the hollow cone nozzle is less chance for nozzle plugging than the flat-fan. The hollow cone
also produces a smaller average droplet size than the flat fan at a given spray pressure which can be an
advantage for retention and coverage, but is a disadvantage for drift of droplets out of the target area.

    The micro-rate on sugarbeet should be broadcast for most consistent performance but band spraying
also has given good results. However, the micro-rate should be applied in an 11-inch band for best results.
A 40 degree or 45 degree nozzle should be set about 13 to 14 inches high for an 11-inch band at 40 psi.
The width of the band should be measured at the top of the target weeds for accurate setting of nozzle
height. Use of a wider angle nozzle would reduce the proper nozzle height for an 11-inch band and would
reduce the risk of spray droplet drift and the loss of droplets from the target band. A lower nozzle setting
will allow less drift. An 80 degree even-spray flat -fan nozzle would be set about 6.5 inches high for an
11-inch band. Hollow cone nozzles are available in spray angles wider than 45 degrees. Hollow cone
nozzles are rated for spray angle at 100 psi rather than 40 psi but a nozzle that has an 80 degree spray
angle at 100 psi would have about a 70 degree angle at 40 psi. A 70 degree angle nozzle should be set
about 8 inches high for an 11-inch band. A hollow cone nozzle should be used at no more than 40 to
60 psi for the micro-rate to reduce the risk of drift. Hollow cone nozzle naturally produce small droplets.

    Both flat-fan even-spray nozzles and hollow cone nozzles can be used successfully for band spraying
and each has advantages and disadvantages. Personal preference and availability probably will determine
which to use.

Alan Dexter
NDSU/U of MN Extension Sugarbeet Weed Specialist
adexter@ndsuext.nodak.edu

 

LATE PLANTED CORN AND SOYBEAN RESIDUAL PREEMERGENCE HERBICIDES

    With heavy rains causing some late planting or replanting, careful use of early preemerge herbicides
and later post treatments or catch_all post treatments will be needed. This brings to mind a possible
advantage to using the Roundup programs for corn or soybeans. Rather than limit your options, however,
consider some of the newly repositioned residual preemerge herbicides that can help, even in sequential
Roundup programs.

    In corn, consider the benefits, cost and flexibility of the following preemerge herbicides within your
program:

    Axiom by Bayer Corp. is a preplant incorporated (PPI) or preemerge (PRE) grass herbicide that can be
used at a reduced rate in two_pass corn programs with Roundup Ultra in Roundup_Ready corn or at regular
15 to 23 ounce rates in regular corn. It is good on foxtails but is weak on wild oat control. It can be
tank_mixed with many of the other residual soil_applied corn herbicides.

    Balance by Rhone_Poulenc Ag Co. can be used PRE in corn to provide both grass and broadleaf
control at the 1.25 to 2 ounce DF rates. It has recharge activity that is rain_activated. It can also be mixed
with atrazine, acetochlor or metolachlor. It is weaker on wild oat, wild buckwheat and some large_seeded
broadleaf weeds, but can be excellent on green foxtail and black nightshade.

    Frontier by BASF Agricultural Products works on both early_season broadleaf and grass weeds as
an early preplant (EPP), PPI or PRE. It will provide four to six weeks of residual control at the 20 to
32 fluid ounce rates. It is weaker on wild mustard and wild oat than some products, but has good to
excellent control of foxtails.

    Python WDG by Dow Agrosciences is used to provide broadleaf control but no grass activity in corn.
As a PRE this herbicide works in any tillage type and 0.8 to 1.33 ounce DG or 5 to 3 acre pack will also
work on nightshade. The PRE or the shallow PPI treatments require rain activation. Limit use to soils less
than 7.8 pH only.

    Besides the preemerge corn herbicides mentioned above, weigh their advantages against some of the
older standby products for your specific weed control needs. In soybeans, consider the benefits, cost
and flexibility of the following preemerge herbicides within your program: Axiom and Frontier mentioned
earlier for corn can also be used in soybeans PPI or PRE and are used primarily to control grasses but
Frontier does control eastern black nightshade. Python was also mentioned as a broadleaf herbicide and
it can be used in soybeans as an EPP, PPI or PRE. Do not apply on soils with a pH greater than 7.8.   

    FirstRate by Dow Agrosciences may be soil_applied as either PPI or PRE on Roundup_Ready
soybeans or conventional soybeans. It controls broadleaf weeds, especially the persistent cocklebur,
pigweed and common ragweed. It shouldn't be used on stressed soybeans with iron chlorosis problems
(stay in lower pH soils) and the PRE requires rain for activation.

    Pursuit Plus by American Cyanamid can be used in North Dakota at 1.8 pint per acre, a reduced rate.
The price has been lowered this year on this product. It will control some grass and broadleaf weeds,
with excellent control of foxtail, lambsquarters, nonresistant kochia and black nightshade.

    Besides the preemerge soybean herbicides mentioned above, weigh their advantages against some
of the older standby products for your specific weed control needs.

Denise A. McWilliams
Extension Crop Production Specialist
dmcwilli@ndsuext.nodak.edu


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