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ARS Home » Research » Publications at this Location » Publication #98571
Title: ANNUAL WEED CONTROL RESEARCH REPORT, 1998

Author
item MAXWELL, DOUGLAS - UNIVERSITY OF ILLINOIS
item HART, STEPHEN - UNIVERSITY OF ILLINOIS
item WAX, LOYD
item SIMMONS, FREDERICK - UNIVERSITY OF ILLINOIS
item STOLLER, EDWARD
item MCGLAMERY, MARSHAL - UNIVERSITY OF ILLINOIS
item TRANEL, PATRICK - UNIVERSITY OF ILLINOIS

Submitted to: Annual Weed Control Research Reports
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/10/1999
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 additives, and cultural and mechanical practices, were involved with the aim of developing new and improved systems of weed management that are effective, economical and environmentally sound. A major emphasis this year was to investigate the interaction of herbicide tolerant crops, reduced herbicide inputs, and close row spacings to help in weed management programs. The purpose of this report is to inform our colleagues at other universities and research locations, industry cooperators, and other interested groups about the results of our 1998 studies as soon as possible. This will allow for comparisons of findings across the region and facilitate planning for additional studies in 1999 to fine-tune the results found in previous years. These results are beneficial to ARS, State, and Industry scientists and extension personnel in planning for future studies and in designing improved weed management systems. This report also provides essential data to support label registration packages for new herbicide and additive uses, and is useful to extension personnel in providing a database for them to draw on in preparing guidelines for weed management.

Technical Abstract: Weed management experiments with standard and new herbicides, additives, and mechanical and cultural practices, were conducted over several environmental conditions and soil types. Postemergence applications, with low herbicide inputs and adjuvants to improve efficacy, were emphasized in 1998. New combinations were found that provided improved control of selected weeds with good crop safety in corn and soybeans. Reduced crop row spacing with herbicide tolerant cropping systems gave very good weed control, crop quality and yields, with reduced inputs of soil-applied herbicides. Research on herbicide-resistant weed biotypes in growers' fields showed good results with integrated systems over several years. 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. Studies on competition showed the extent and timing of competition due to weeds in corn and soybeans. The need for appropriate timing among the chloroacetamide herbicides for optimum weed control was demonstrated at several locations. 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.