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ARS Home » Research » Publications at this Location » Publication #108898
Title: ANNUAL WEED CONTROL RESEARCH REPORT, 1999

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 ROREM, KENT - UNIV OF ILLINOIS
item Stoller, Edward
item MCGLAMMERY, MARSHAL - UNIV OF ILLINOIS

Submitted to: Annual Weed Control Research Reports
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 1/24/2000
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. Major emphasis this year was placed on the interaction of herbicide tolerant crops, reduced herbicide inputs, and close row spacing to help in weed management programs. The purpose of the report is to inform our colleagues in the public and private sector and other interested clientele about the results of our 1999 field studies as soon as possible. This will allow for comparisons of findings across the region and help in planning for additional studies as needed in 2000 to fine-tune the result found in previous years. These results are beneficial to ARS, State and Industry scientists and to 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 herbicides and additive uses, and is useful to extension personnel in providing a data base for them to draw on in preparing guidelines for weed management.

Technical Abstract: Experiments on weed management 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 1999. We found new combinations that provided improved control of selected weeds with good crop safety in corn and soybeans. Reducing crop row spacing with herbicide tolerant corn and soybeans resulted in improved weed control, high crop quality, high yields, with reduced inputs of soil applied herbicides. Investigations in growers fields with herbicide resistant biotypes of weeds resulted in 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. Competition studies showed the extent and timing of weed competition between weeds and crops. The need for correct timing of applications with the chloroacetamide herbicides was shown 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.