CORN
Crop Observation and Recommendation Network

January 7-22, 2002
C.O.R.N. 2002-1

In This Issue:

A) Not Too Late To Register For January Regional Agronomy Meetings
B) Soybean Cyst Nematode Will Adapt To Scn Resistant Varieties
C) Epa Proposes Spray Drift Changes
D) 2002 Weed Control Guide Is Available
E) Another Als-Resistant Weed Species In Ohio
F) Potential Of Corn Grain As Heating Fuel

A) Not Too Late To Register For January Regional Agronomy Meetings CORN Questions

The December Regional Agronomy meetings start next week. An excellent agenda along with credits for CCA and Pesticide Applicator Training can be obtained at each. Early registration ends one week prior to the meetings and cost $15. But call ahead and reserve your spot at the door for only $20, still a bargain.

January 15, 2002
Wayne Co., Wooster
Fisher Auditorium, OARDC
1680 Madison Road (St. Rt. 250)
Host Agent: Mike Miller
330-725-4911
miller.26@osu.edu

January 15, 2002
Portage Co., Kent
Holiday Inn
State Route 43 (North)
exit on I-76 east of Akron
330-296-6432
oreilly.18@osu.edu

January 16, 2002
Highland Co., Hillsboro
Highland County Training
and Employment Center
1575 North High Street (U.S. 62)
Host Agent: John Grimes
937-393-1918
grimes.1@osu.edu

January 18, 2002
Preble Co., Eaton
Bruner Arena, Preble County Fairgrounds
722 South Franklin Street
Host Agent: Bonnie Norris
937-456-8174
norris.84@osu.edu

B) Soybean Cyst Nematode Will Adapt To Scn Resistant Varieties - Anne Dorrance, Pat Lipps, Dennis Mills And Mac Riedel CORN Questions

There were some questions during the agronomy and pesticide training meetings last month concerning the use of resistant soybean varieties in fields without cyst nematodes. There is a definite risk to this type of practice and producers need to be aware of this risk and manage that field accordingly. We don't recommend using SCN resistant varieties in fields which are not sampled or where samples have been negative and this is why.

SCN exists in fields as a population of individuals with different feeding preferences for the different sources of resistance, PI88788, Hartwig and Peking. Each cyst egg or juvenile denotes one individual in this population. As resistant sources are planted, those individuals that can reproduce on the resistant soybean will begin to increase in numbers. As resistant beans are planted continuously, these cysts will increase at the same rate as they would on varieties without the SCN resistance. Unfortunately, growers have planted SCN resistant beans continuously in at least ½ dozen fields in Ohio, since we began extensive planting of SCN resistant varieties. The final SCN population numbers in these fields were over 100,000 eggs/cup of soil.

How can you tell if you are starting to create a problem? You will begin to see dips in the yield monitor in specific area(s) of the field. These spots will increase in size (if tilled) and yields will continue to drop. This is a good spot, to stop the combine and grab a soil sample.

SCN resistant varieties should be planted in fields with less than about 2,000 eggs per cup of soil combined with crop rotation. When SCN resistant beans are planted continuously into fields with low SCN populations, we see is a delay in the SCN population increase of 3 to 4 years, depending on the source of resistance, when using these resistant varieties.

We do not recommend planting SCN resistant varieties in fields with high cyst nematode populations (greater than 2,000 eggs/cup soil). This will only select for those nematodes that can reproduce well on that source of resistance that will result in higher SCN populations in a much shorter period of time.

If you do plant SCN resistant varieties, you will need to be more vigilantes on soil sampling and testing for SCN. There are still very few sources of resistance available, it takes at least 15 years to transfer this resistance into high yielding soybean varieties. Sample these fields every two years for continuous beans.

Using SCN resistant varieties is not a substitute for using crop rotation to reduce SCN population levels. Crop rotation is the most effective means to reduce SCN population numbers.

C) Epa Proposes Spray Drift Changes CORN Questions

EPA has issued a proposed Pesticide Registration (PR) Notice proposing to adopt several new requirements for pesticide label language regarding pesticide drift. It would apply to any product applied outdoors as a spray or dust, except for fumigants and mosquito adulticides products labeled solely for use in public health programs. The proposed rules can be found at http://www.epa.gov/opppmsd1/PR_Notices/prdraft-spraydrift801.htm Comments on the proposed PR Notice are due by January 19, 2002.

Proposal Overview
The Agency proposes to require a standard paragraph for the labels of all covered products, and additional mandatory language that varies by application method. The Agency proposes to adopt a policy that would let it mandate additional restrictions on a product-by-product basis. In particular, it wants to decide what levels of drifted pesticide are unacceptable for various kinds of "sensitive areas," and then use the AgDrift model to calculate a "no-spray zone" (buffer zone) that would ban the release of pesticide spray or dust within that zone.

Comments can be filed with the EPA by identifying documents with the docket control number OPP-00730. Comments can be sent to:

Public Information and Records Integrity Branch (PIRIB)
Information Resources and Services Division (7502C)
Office of Pesticide Programs (OPP)
Environmental Protection Agency
1200 Pennsylvania Ave., NW
Washington, D.C. 20460

D) 2002 Weed Control Guide Is Available - Jeff Stachler CORN Questions

The 2002 Weed Control Guide is now available at your local County Extension Office. New herbicides, like Valor and Callisto have been added to the guide. The major upgrade to the 2002 Guide are sections about general weed control strategies for burndown herbicides, corn, soybean, wheat, and forages. This years version also has a new look to the cover as it has been upgraded to color pictures. The 2002 Weed Control Guide is Bulletin 789.

E) Another Als-Resistant Weed Species In Ohio - Jeff Stachler CORN Questions

A population of smooth pigweed collected from Madison County has been confirmed ALS-resistant based upon greenhouse research. Pinnacle and Python applied postemergence at two times the labeled rate provided only 20 and 4 percent control of this smooth pigweed population, respectively, thus confirming resistance. The population was sensitive to Raptor. This makes the eighth weed species to be confirmed ALS-resistant in Ohio.

F) Potential Of Corn Grain As Heating Fuel - Thomison CORN Questions

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Past versions of C.O.R.N. can be found on the World Wide Web at: http:/www.ag.ohio-state.edu/~corn/archive/

C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.

Editor: Greg La Barge        Web Editor: Tom Rosati

Information presented above and where trade names are used, they are supplied with the understanding that no discrimination is intended and no endorsement by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

All educational programs conducted by Ohio State University Extension are available to clientele on a nondiscriminatory basis without regard to race, color, creed, religion, sexual orientation, national origin, gender, age, disability or Vietnam-era veteran status.

Issued in furtherance of Cooperative Extension work, Acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture, Keith L. Smith, Director, Ohio State University Extension.

TDD # 1 (800) 589-8292 (Ohio only) or (614) 292-1868

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