Abstract
Annual treatment with 1 lb/A of 2,4-D (2,4-dichlorophenoxyacetic acid) repeated for several years during mid- to late June gave excellent control of ironweed (Vernonia baldwinii). Later dates of treatment were not as effective. Mowing was not satisfactory as a weed control measure for ironweed. The populations in mowed plots in long-term experiments closely paralleled populations of untreated plots. Where numbers were reduced by spray treatment, recovery or reinfestation was comparatively slow. Quadrat counts were compared with visual estimation as methods of evaluating effects of treatments. The estimation method did not permit quantitative evaluation of year-to-year treatment or environmental effects.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
