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ARS Home » Research » Publications at this Location » Publication #101684
Title: WEED EMERGENCE SEQUENCES: KNOWLEDGE TO GUIDE SCOUTING AND CONTROL

Author
item HARTZLER, R - IOWA STATE UNIVERSITY
item Buhler, Douglas - Doug
item BOERBOOM, C - UNIVERSITY OF WISCONSIN
item GUNSOLUS, J - UNIVERSITY OF MINNESOTA
item Wax, Loyd

Submitted to: Extension Publications
Publication Type: Experiment Station
Publication Acceptance Date: 5/20/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Although the initial emergence date for weeds varies from year to year, the emergence sequence of different weeds is fairly constant. Each group presented on the poster includes weeds that begin to emerge at similar dates. Most weeds emerge over a prolonged time period, so weeds from earlier groups may still be emerging when later groups begin to emerge. The GDD (base 48) information is an estimate of heat units required to reach 10% emergence. Other factors (cloud cover, soil moisture, crop residue) influence soil temperature and therefore timing of weed emergence. Knowing when weeds begin to emerge can improve weed management by helping to determine when to scout fields and implement control tactics. The emergence of important weeds can be anticipated by using this knowledge of weed emergence sequence.