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Title: COMPARISONS OF ZA-1296 AND RPA 20172 FOR WEED CONTROL IN CORN, URBANA, ILLINOIS, 1999

Author
item SPRAGUE, CHRISTY - UNIV OF ILLINOIS
item MAXWELL, DOUGLAS - UNIV OF ILLINOIS
item Wax, Loyd

Submitted to: Research Report North Central Weed Science Society United States
Publication Type: Other
Publication Acceptance Date: 12/4/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: The objective of this research was to compare different weed control strategies in corn utilizing ZA-1296 and RPA 201772. The study was established at the University of Illinois Crop Sciences Research and Education Center, Urbana. The soil was a Flanagan silt loam with a pH of 6.3 and 4.7% organic matter. Pioneer 35N095 corn was planted 1.5 inches deep on May 27 in 30 inch rows. Treatments were arranged in randomized complete blocks with four replications of plots 10 by 36 feet. Herbicides were applied with a CO2 backpack sprayer delivering 20 gpa and equipped with 8003 flat fan nozzles for preemergence applications and 8002 flat fan nozzles for postemergence applications. Corn tolerance to all herbicide treatments was excellent at each evaluation timing. All soil-applied herbicide treatments containing either RPA 201772 or ZA-1296 provided excellent control of giant foxtail, velvetleaf, and jimsonweed 15 days after application. Soil-applied ZA-1296 also provided good control of common cocklebur at this evaluation timing. Adding of atrazine to RPA 201772 tank-mixtures enhanced common cocklebur control. Postemergence applications of ZA-1296 alone and in combination with atrazine provided excellent velvetleaf, common cocklebur, and jimsonweed control, 14 days after treatment, as did dicamba plus atrazine or CGA-152005 plus primisulfuron. Corn yields from most treatments were similar to the weed-free control. There was a slight decrease in corn yield from acetochlor plus atrazine at 3.25 lb/A combined with RPA 201772 at 0.047 lb/A. This reduction in yield was probably attributed to an increase in weed competition from the decreased common cocklebur control noted later in the season.