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2004

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Agricultural Science

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Articles 1 - 30 of 357

Full-Text Articles in Life Sciences

Systematics Of Dirca (Thymelaeaceae) Based On Its Sequences And Issr Polymorphisms, James A. Schrader, William R. Graves Dec 2004

Systematics Of Dirca (Thymelaeaceae) Based On Its Sequences And Issr Polymorphisms, James A. Schrader, William R. Graves

Horticulture Publications

The genus Dirca consists of three disjunct species of shrubs. Dirca palustris is found in the eastern United States and adjacent Canada; D, occidcntahs is Umited to six counties near the San Francisco Bay in California; and the recently discovered D, mcxicana is known from one isolated population in northeastern Mexico. The three species have been described and classified according to morphological characters, but the morphological evidence does not provide a clear assessment of the relationships among the species. Morphologically D. mexicana most closely resembles D. occidenlalis., but known biogeographical trends raise doubt regarding how the three species are interrelated ...


Knowing The Risk Of Soybean Rust By Comparison With Brazil, X. B. Yang, Emerson M. Del Ponte, Ana Paula Dias Dec 2004

Knowing The Risk Of Soybean Rust By Comparison With Brazil, X. B. Yang, Emerson M. Del Ponte, Ana Paula Dias

Integrated Crop Management News

One of the common questions we receive is whether to move away from soybean because of the risk of soybean rust (SBR). Although studies indicate that the U.S. soybean production region is suitable to this disease, many experts believe outbreaks of the disease are likely to be sporadic.


Isu Introduces The Corn And Soybean Initiative, Brian Gene Meyer Dec 2004

Isu Introduces The Corn And Soybean Initiative, Brian Gene Meyer

Integrated Crop Management News

The Corn and Soybean Initiative is a new effort at Iowa State University to better serve the needs of Iowa's number-one-in-the-nation corn and soybean growers. "Iowa has the best crop producers in the country and they just keep getting better," said Greg Tylka, coordinator of the initiative and a professor of plant pathology. "Iowa State's Corn and Soybean Initiative will work to make sure that trend continues by providing a central access point for research-based production information and education.


Workshop In Using Living Mulch Systems For Grain Crop Production, Palle Pedersen, Jodee Roland Dec 2004

Workshop In Using Living Mulch Systems For Grain Crop Production, Palle Pedersen, Jodee Roland

Integrated Crop Management News

Incorporation of perennial legumes and cover crops into our row cropping systems and reduction of tillage will reduce soil erosion and concurrent loss of phosphorous and nitrogen to the surface water. Kura clover (Trifolium ambiguum) is a relatively new forage legume in North America that can be used in a living mulch system. It has an excellent forage yield and is persistent under a wide range of soil and climatic environments. Iowa Department of Agriculture and Land Stewardship, and Integrated Farm/Livestock Management Demonstration Program, with the assistance of Iowa State University Extension, are currently funding a large on-farm demonstration ...


Commercial Pesticide Applicator Training Sessions For Spring 2005, James A. Fawcett, Virgil L. Schmitt Dec 2004

Commercial Pesticide Applicator Training Sessions For Spring 2005, James A. Fawcett, Virgil L. Schmitt

Integrated Crop Management News

With the arrival of Asian soybean rust in this country, many commercial applicators are adding agricultural diseases (category 1C) to their certification so that they can apply fungicides. Most agricultural commercial applicators are certified in Ag Weeds (category 1A), and many are certified in Ag Insects (category 1B), but not very many are certified in Ag Diseases (category 1C).


Arkansas Soybean Performance Tests 2004, D. G. Dombek, D. K. Ahrent, R. D. Bond, I. L. Eldridge Dec 2004

Arkansas Soybean Performance Tests 2004, D. G. Dombek, D. K. Ahrent, R. D. Bond, I. L. Eldridge

Research Series

No abstract provided.


Arkansas Corn And Grain Sorghum Performance Tests 2004, D. G. Dombek, D. K. Ahrent, R. D. Bond, I. L. Eldridge Dec 2004

Arkansas Corn And Grain Sorghum Performance Tests 2004, D. G. Dombek, D. K. Ahrent, R. D. Bond, I. L. Eldridge

Research Series

No abstract provided.


Seed Production In Corn And Soybean, Kendall Lamkey Dec 2004

Seed Production In Corn And Soybean, Kendall Lamkey

Agronomy Reports

Seed production is one of the least visible yet most important aspects of food and feed production. This part of the system is often taken for granted, even by the farmers who plant the seed. One of the reasons is that much of the seed in the United States is provided by the private sector, particularly for corn and soybean. Also, seed production is a technical process that requires in-depth knowledge of the reproductive mechanisms in plants.


Resource Conservation Practices: Manure And Tillage Management, Mahdi Al-Kaisi, H. Mark Hanna, Mark A. Licht Dec 2004

Resource Conservation Practices: Manure And Tillage Management, Mahdi Al-Kaisi, H. Mark Hanna, Mark A. Licht

Agriculture and Environment Extension Publications

Adopting best management practices throughout an operation must take into consideration both manure application and tillage management.


Quality Of The 2004 Soybean Crop From The United States, Thomas J. Brumm, Charles R. Hurburgh Jr., Glen R. Rippke Nov 2004

Quality Of The 2004 Soybean Crop From The United States, Thomas J. Brumm, Charles R. Hurburgh Jr., Glen R. Rippke

Agricultural and Biosystems Engineering Technical Reports and White Papers

Quality continues to be an important soybean marketing issue. This report summarizes current knowledge on the following soybean quality topics: • protein and oil composition of the 2004 U.S. soybean crop, • the 2004 crop in historical perspective, • weather conditions affecting the 2004 crop, • Asian soybean rust and its possible impact on the U.S. soybean crop, • programs by growers and U.S. processors to improve quality, • a study being funded by ASA to examine foreign material in soybean shipments, and • the production of low-linolenic soybeans. The data and analyses in this report are intended to assist customers in the sourcing ...


Two-Year Summary Of Corn Rootworm Insecticides And Yieldgard® Rootworm, Marlin E. Rice, James Oleson Nov 2004

Two-Year Summary Of Corn Rootworm Insecticides And Yieldgard® Rootworm, Marlin E. Rice, James Oleson

Integrated Crop Management News

Two integrated pest management strategies are commonly used to protect corn roots from corn rootworm injury: crop rotation and insecticides. If corn is not rotated, or if extended diapause northern corn rootworms occur in a field, a soil insecticide might be necessary to protect the roots in 2005. The reason we say it might be necessary is because many fields do not have a rootworm population of a sufficient size to cause economic damage. There are thousands of continuous cornfields across Iowa in which a rootworm insecticide is not used and is not necessary.


Icm Conference December 1-2, 2004, Brent A. Pringnitz Nov 2004

Icm Conference December 1-2, 2004, Brent A. Pringnitz

Integrated Crop Management News

The 16th Annual Integrated Crop Management Conference (ICM) will be held December 1 and 2 at the Iowa State Center on the Iowa State University campus in Ames. Registration begins at 9:00 a.m. on December 1 in Stephens Auditorium, and the conference concludes at 4:00 p.m. on December 2. During the conference participants will hear of Iowa's expanding ethanol industry and the impact that will have on grain marketing and agronomics.


Scn-Resistant Soybean Varieties Listed In Updated Publication, Gregory L. Tylka Nov 2004

Scn-Resistant Soybean Varieties Listed In Updated Publication, Gregory L. Tylka

Integrated Crop Management News

Soybean cyst nematode (SCN) is a serious and widespread pest of soybean throughout Iowa and the Midwest. Fortunately, SCN-resistant soybean varieties have been developed and are an effective management tool. To assist growers in choosing SCN-resistant varieties, Iowa State University Extension annually compiles and publishes a list of public and private SCN-resistant soybean varieties in maturity groups I, II, and III.


Soybean Rust First Detector Training Session Announced, Gregory L. Tylka, Brent A. Pringnitz Nov 2004

Soybean Rust First Detector Training Session Announced, Gregory L. Tylka, Brent A. Pringnitz

Integrated Crop Management News

Asian soybean rust is a topic of great interest among Iowa soybean growers and agribusiness. The Iowa Department of Agriculture and Land Stewardship, the Iowa Soybean Association and Promotion Board, and Iowa State University have formed the Iowa Soybean Rust Team and have developed a system in Iowa whereby soybean samples that are suspected of possibly being infected with soybean rust can be examined and passed through a sequence of trained personnel to offer Iowa soybean growers rapid and accurate identification of the disease.


Asian Soybean Rust Confirmed In The Continental United States, Alison E. Robertson Nov 2004

Asian Soybean Rust Confirmed In The Continental United States, Alison E. Robertson

Integrated Crop Management News

On November 10, 2004, the United States Department of Agriculture (USDA) and the Iowa Department of Agriculture and Land Stewardship announced that Asian soybean rust has been confirmed near Baton Rouge, LA. The fields where the rust was found are located on research farms belonging to Louisiana State University. No information was given on the stage of plant growth in the fields. Most of the commercial fields in Louisiana have been harvested. X.B. Yang, Iowa State University plant pathologist, is one of the leading experts in the world and has flown down to Louisiana as a member of the ...


Fourth Iowa Organic Conference A Success, Kathleen Delate Nov 2004

Fourth Iowa Organic Conference A Success, Kathleen Delate

Integrated Crop Management News

Stanley Johnson, vice-provost for Extension at Iowa State University, welcomed the crowd of 295 registrants at the Fourth Annual Iowa Organic Conference in the Scheman Building on Monday, November 1, 2004, to the home of the "best organic research and extension program in the United States," according to Rodale Press.


C-Terminal 23 Kda Polypeptide Of Soybean Gly M Bd 28 K Is A Potential Allergen, Ping Xiang, Eric J. Haas, Michael G. Zeece, John P. Markwell, Gautam Sarath Nov 2004

C-Terminal 23 Kda Polypeptide Of Soybean Gly M Bd 28 K Is A Potential Allergen, Ping Xiang, Eric J. Haas, Michael G. Zeece, John P. Markwell, Gautam Sarath

Publications from USDA-ARS / UNL Faculty

Gly m Bd 28 K is a major soybean (Glycine max Merr.) glycoprotein allergen. It was originally identified as a 28 kDa polypeptide in soybean seed flour. However, the full-length protein is encoded by an open reading frame (ORF) of 473 amino acids, and contains a 23 kDa C-terminal polypeptide of as yet unknown allergenic and structural characteristics. IgE-binding (allergenic potential) of the Gly m Bd 28 K protein including the 23 kDa C-terminal portion as well as shorter fragments derived from the full-length ORF were evaluated using sera from soy-sensitive adults. All of these sera contained IgE that efficiently ...


Shiga Toxin Binding To Isolated Porcine Tissues And Peripheral Blood Leukocytes, Kellie R. K. Winter, William C. Stoffregen, Evelyn A. Dean-Nystrom Nov 2004

Shiga Toxin Binding To Isolated Porcine Tissues And Peripheral Blood Leukocytes, Kellie R. K. Winter, William C. Stoffregen, Evelyn A. Dean-Nystrom

Publications from USDA-ARS / UNL Faculty

Shiga toxin (Stx) binding sites in porcine tissues and leukocytes were identified by the use of Stx overlay and anti-CD77/Gb3 immunoassays. Stx1 and Stx2 bound to similar tissue locations and leukocytes, although some differences were noted. Previously unreported Stx binding sites were identified in kidney tubules, intestinal lymphoid aggregates, sinusoidal liver cells, alveolar macrophages, and peripheral blood leukocytes.


Corn Ear Molds And Mycotoxins In Fall 2003, Gary P. Munkvold Oct 2004

Corn Ear Molds And Mycotoxins In Fall 2003, Gary P. Munkvold

Integrated Crop Management News

There has been elevated concern again this year about mycotoxins in grain, especially aflatoxins. Aflatoxins are not a common problem in Iowa, but the dry weather that occurred in some parts of the state caused stress on the plants, which lead to aflatoxin problems. Corn plants that experience drought stress are more susceptible than usual to the fungus that produces aflatoxins, Aspergillus flavus.


Chemical Composition That Attract Arthropods- Patent 2004, Ulrich R. Bernier, Donald R. Barnard, Matthew Booth, Daniel Kline, Kenneth H. Posey, Richard A. Yost Oct 2004

Chemical Composition That Attract Arthropods- Patent 2004, Ulrich R. Bernier, Donald R. Barnard, Matthew Booth, Daniel Kline, Kenneth H. Posey, Richard A. Yost

Publications from USDA-ARS / UNL Faculty

Compositions and methods employing the compositions for attracting arthropods. The compositions comprise at least one compound of formula I and at least one compound from group II.


2004 Ag Chemical Dealer Updates, Brent A. Pringnitz Oct 2004

2004 Ag Chemical Dealer Updates, Brent A. Pringnitz

Integrated Crop Management News

Crop production changes at a rapid pace. New products, label revisions, regulatory requirements, soil nutrient recommendations--just some of the items you need to stay up to date on to better serve your customers. The Ag Chemical Dealer Updates are designed to do just that. The Ag Chemical Dealer Updates are intended to deliver the latest crop production recommendations, news, and information directly from Iowa State University Extension.


Check Seed Quality At Harvest, X. B. Yang Oct 2004

Check Seed Quality At Harvest, X. B. Yang

Integrated Crop Management News

This growing season, diseases caused by Cercospora fungi were widespread in Iowa. There were twoCercospora species, one causing frogeye leaf spot and another causing Cercospora leaf blight. Frogeye leaf spot occurred locally in southern Iowa and Cercospora leaf blight was widely spread throughout Iowa. In some cases, Cercospora leaf blight has been called "sunburn." Because fungi of both diseases can infect seeds at harvest, it is likely that soybean from some fields show seed discoloration, which happened two years ago in northern Iowa. This article addresses the seed quality issue of this fall.


High Prices And Tight Supply Make Fertilization Decisions Tough, John E. Sawyer Oct 2004

High Prices And Tight Supply Make Fertilization Decisions Tough, John E. Sawyer

Integrated Crop Management News

Nitrogen (N) fertilizer prices have been high the past few years, and continue to be this fall. Additionally, other fertilizer products have increased in price, with supply shortages of potassium (K) fertilizer possible. Why is this occurring? Several factors are interacting to influence both supply and price. These include high natural gas price (main feedstock for manufacture of N fertilizer), closure of about one-quarter of the U.S.


Stinkhorns Spotted In Fields, Paula Flynn Oct 2004

Stinkhorns Spotted In Fields, Paula Flynn

Integrated Crop Management News

John Holmes, extension field crop specialist, reported that farmers are finding lots of stinkhorn mushrooms in soybean fields as they harvest. These fungi do not cause disease to plants or animals, but instead live a harmless existence on dead organic matter such as crop debris. They also are commonly found on decaying mulch. A stinkhorn begins life as an egg-like structure.


Midwest Rural And Agricultural Safety And Health Forum, Eileen Fisher Oct 2004

Midwest Rural And Agricultural Safety And Health Forum, Eileen Fisher

Integrated Crop Management News

Iowa's Center for Agricultural Safety and Health, the Great Plains Center for Agricultural Health, and The Roy J. and Lucille A. Carver College of Medicine, The University of Iowa, are joining together to co-sponsor the Midwest Rural and Agricultural Safety and Health Forum on November 18-19, 2004, at the Holiday Inn in Coralville, Iowa.


Fall Is Prime Time To Sample Fields For Scn, Gregory L. Tylka Oct 2004

Fall Is Prime Time To Sample Fields For Scn, Gregory L. Tylka

Integrated Crop Management News

The soybean cyst nematode (SCN) is an extremely damaging and widespread pest of soybean in Iowa. The nematode infests approximately 70 percent of the fields statewide. However, SCN usually causes no obvious aboveground symptoms for many years after being introduced into a field. Consequently, many SCN-infested fields in Iowa have not been diagnosed. The lack of symptoms and subsequent missed diagnosis are unfortunate because the key to effective management of SCN is early detection, before large nematode population densities develop.


Corn Ear Rots, Alison E. Robertson Oct 2004

Corn Ear Rots, Alison E. Robertson

Integrated Crop Management News

This year does not appear to be a particularly bad year for ear rots. The season has been cooler than normal, and the weather has been fairly dry since silking. However, some field crop specialists have noticed ear rot problems, in particular, Diplodia ear rot. The incidence of corn ear rot should be determined before harvest for a number of reasons. First, ear rot diseases can reduce yield and quality of the corn harvest. Second, some of the fungi that infect corn ears may produce mycotoxins, which are harmful, and can be fatal, to livestock. Finally, ear rots can continue ...


Check Seed Quality At Harvest, X. B. Yang Oct 2004

Check Seed Quality At Harvest, X. B. Yang

Integrated Crop Management News

This growing season, diseases caused by Cercospora fungi were widespread in Iowa. There were twoCercospora species, one causing frogeye leaf spot and another causing Cercospora leaf blight. Frogeye leaf spot occurred locally in southern Iowa and Cercospora leaf blight was widely spread throughout Iowa. In some cases, Cercospora leaf blight has been called "sunburn." Because fungi of both diseases can infect seeds at harvest, it is likely that soybean from some fields show seed discoloration, which happened two years ago in northern Iowa. This article addresses the seed quality issue of this fall.


Residue Management After Harvest, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman Oct 2004

Residue Management After Harvest, Mahdi Al-Kaisi, H. Mark Hanna, Michael Tidman

Integrated Crop Management News

As we are in the harvest season, producers are searching for the best way to manage their residue cover, particularly with corn. Some farmers manage their residue by chopping, bailing, or grazing in livestock operations. But before planning to use any of these options or others, and reducing corn residue cover after this year's harvest, one of the first things to plan for is the remaining crop residue coverage. With that in mind, producers need to ask themselves a series of questions.


Summaries Of Arkansas Cotton Research 2003, Derrick M. Oosterhuis Oct 2004

Summaries Of Arkansas Cotton Research 2003, Derrick M. Oosterhuis

Research Series

No abstract provided.