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Title: ANNUAL WEED CONTROL RESEARCH REPORT, 2000

Author
item MAXWELL, DOUGLAS - UNIV OF ILLINOIS
item SPRAGUE, CHRISTY - UNIV OF ILLINOIS
item Wax, Loyd
item SIMMONS, FREDERICK - UNIV OF ILLINOIS
item HAGER, AARON - UNIV OF ILLINOIS
item HASTY, RYAN - UNIV OF ILLINOIS

Submitted to: Annual Weed Control Research Reports
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/17/2001
Publication Date: N/A
Citation: N/A

Interpretive Summary: This is a report of various weed management investigations conducted cooperatively at several experiment stations and on grower fields in Illinois by USDA/ARS and University of Illinois personnel. Many new herbicides and adjuvants, and cultural and mechanical practices, were involved with the goal of developing new and improved systems of weed management that are effective, economical and environmentally sound. A major research thrust in the 2000 season was to investigate the interaction of herbicides and diseases on soybean growth and development, develop improved management systems for use with tolerant crops, research reduced herbicide inputs, and assess interactions between different classes of herbicides and also assess the value of adjuvants in improving herbicide effectiveness. We continued to develop strategies for management of biotypes of herbicide resistant weed species. The purpose of the report is to inform our colleagues and cooperators in the public and private sector, and other interested parties, about the results of our 2000 studies as soon as possible. This will allow for comparisons of results across the region and help in planning additional studies in 2001 to fine-tune the findings of previous years. These results are beneficial to ARS, State, and Industry scientists and extension personnel in planning for future studies and in designed improved weed management systems. This report also provides essential data to support label registration packages for new herbicides and adjuvant uses, and is useful to extension personnel in providing a database for preparing guidelines for weed management.

Technical Abstract: Weed management studies, with standard and new herbicides, adjuvants, and mechanical and cultural practices, were conducted over several environmental conditions and soil types. New combinations were found that provided improved control of selected weeds with good crop safety in corn and soybean. Interactions were found between diseases and herbicides in terms of the amounts of injury sustained by soybeans and the eventual growth and yield of soybeans. Remote sensing was used to assess presence of weed populations and the occurrence of herbicide injury on crops and weeds. Reduced crop row spacing with herbicide tolerant cropping systems gave very good weed control, and high yields, with reduced inputs of soil-applied herbicides. Research on herbicides-resistant weed biotypes in growers' fields showed good results with integrated systems. Sequential treatments involving pre and post herbicides with various modes of action, plus cultivation or narrow rows, provided very good control of resistant weed biotypes. Competition studies showed the extent and timing of competition in corn and soybean due to weeds. Simulated rainfall studies demonstrated differences among herbicides in amount of water needed to cause the herbicides to be effective. Experiments on postemergence herbicides showed the best times and methods to apply herbicides for optimum effectiveness and safety and pointed out potential times and conditions that crop injury and yield reduction might occur. These results provide rapid feedback to our cooperators and the weed science community, assist in planning for improved studies in the future, provide data for label packages, and are beneficial to extension personnel in preparing weed management guidelines.