Crop Tech

November 13, 2009 01:10 PM

Get a Jump on Weeds

There's finally a herbicide name that actually fits its use. Prequel, a new DuPont herbicide for corn, jump-starts the growing season. Containing the active ingredients rimsulfuron and isoxa-flutole, it's been tested as a burndown and a residual grass and broadleaf herbicide applied pre-emergence in front of conventional and herbicide-tolerant corn hybrids.

Jeff Carpenter, corn portfolio manager for DuPont Crop Protection, says Prequel's multiple modes of action provide for longer-lasting, more consistent early season control of weeds, such as ragweed and pigweed.

"Prequel keeps fields clean early to give corn the best start,” Carpenter says. University of Illinois weed scientist Aaron Hager notes, "Early season weed interference tends to cause loss in yield potential earlier in corn's life than in that of some other agronomic crops.”

DuPont says the best results for burndown activity Prequel will be obtained if applications are made when weeds are small. When weeds are taller than 3", an additional burndown herbicide is recommended. Prequel demonstrates additional burndown and residual activity on emerged weeds when tank-mixed with full or reduced rates of atrazine.

Prequel is formulated as a water-dispersible granule that is a new proprietary formulation from DuPont. Applied at 1.66 oz. of product per acre, it is absorbed by roots and foliage. Warm moist conditions have been shown to accelerate residual activity.

The rates (and composition) of the component materials are such that a subsequent post-emergence herbicide may be needed to achieve satisfactory weed control.


Corn hybrids containing the new trait platform called SmartStax get the opportunity to reduce crop insurance premiums in 2010.
Stacked Insurance

U.S. farmers who plant corn hybrids containing SmartStax, a multievent technology developed by Monsanto Company and Dow AgroSciences, in 2010 will be eligible to reduce their crop insurance premium rate as part of the Pilot Biotechnology Endorsement program through the USDA's Federal Crop Insurance Corporation.

The Pilot Biotechnology Endorsement lowers crop insurance premium rates in 2010 for irrigated and nonirrigated corn farmers who meet the program eligibility requirements and plant certain qualifying hybrids in Colorado, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, Ohio, South Dakota and Wisconsin. Growers in these states will also be able to reduce their insect refuge to 5% through the use of SmartStax.

The cost of a total producer-paid premium during the 2008 pilot program was reduced on average by more than $3 per acre. Total savings for participating growers within the four-state pilot geography in 2008 is estimated to be nearly $25 million. 

To be eligible for the rate reduction, at least 75% of total insured corn acres, including replanted acres, on a unit basis must be corn for grain planted to eligible hybrids.


Weed Whizzes

Can you tell the difference between common mallow and common mullein? Do you know hophornbeam from horseweed? The 2009 Collegiate Weed Science Contest asked students to test their mettle by identifying 25 weed species at various stages of development—from seed to seedlings to fully mature plants. Competing for the "Golden Hoe” awards were 85 students from 11 universities. Penn State took top honors in the graduate division, and the University of Guelph topped the undergraduate division.

Visit to test your weed knowledge.


Back to news


Spell Check

No comments have been posted to this News Article

Corn College TV Education Series


Get nearly 8 hours of educational video with Farm Journal's top agronomists. Produced in the field and neatly organized by topic, from spring prep to post-harvest. Order now!


Market Data provided by
Brought to you by Beyer