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Title: SOYBEAN HERBICIDES FOR HOPHORNBEAM COPPERLEAF CONTROL

Author
item HAGER, AARON - UNIV OF ILLINOIS
item SPRAGUE, CHRISTY - UNIV OF ILLINOIS
item Wax, Loyd

Submitted to: North Central Weed Science Society US Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 12/8/2000
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Hophornbeam copperleaf (Acalypha ostryifolia) is an indigenous species in Illinois that is becoming more common in corn and soybean production systems. Plant taxonomists with the Illinois Natural History Survey have made numerous collections of hophornbeam copperleaf from approximately the southern third of Illinois, but substantially fewer collections from central and northern Illinois. However, over the past five years we have identified populations from corn and soybean fields progressively further north in the state, and in 2000 we identified a hophornbeam copperleaf population in Tazewell county (near Peoria). Data on soybean herbicide efficacy for hophornbeam copperleaf control are limited, so we established a field, experiment during the 2000 growing season to evaluate several soil-applied and postemergence soybean herbicides for hophornbeam copperleaf control. The experiment was located on a producer's field in Tazewell county. Soil-applied herbicides were applied following soybean planting, while postemergence herbicides were applied when hophornbeam copperleaf was approximately 10 cm in height. Evaluations of soil-applied herbicide efficacy were made four and six weeks after application, while postemergence herbicides were evaluated 10 days after application. At each evaluation of soil-applied herbicides, sulfentrazone provided the greatest control of hophornbeam copperleaf, while cloransulam provided the least control. Glyphosate provided between 93 and 95 percent control of hophornbeam copperleaf 10 days after application. Hophornbeam copperleaf control with lactofen, fomesafen, and acifluorfen was generally less than that achieved with glyphosate.