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Hophornbeam Copperleaf (Acalypha ostryifolia) Biology and Control

Published online by Cambridge University Press:  12 June 2017

Michael J. Horak ,
Zhuping Gao ,
Dallas E. Peterson  and
Larry D. Maddux
Michael J. Horak
Affiliation:
Kansas State University, Manhattan, KS 66506
Zhuping Gao
Affiliation:
Kansas State University, Manhattan, KS 66506
Dallas E. Peterson
Affiliation:
Kansas State University, Manhattan, KS 66506
Larry D. Maddux
Affiliation:
Kansas State University, Manhattan, KS 66506
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Abstract

Little is known about the biology and control of hophornbeam copperleaf, a weed of increasing importance in the Midwest. More than 2 wk of cold stratification and a 0.2% KNO3 solution increased germination of hophornbeam copperleaf. Germination at constant 30 C was 47% and alternating 30/20 C was 65%. Scarification did not increase hophornbeam copperleaf germination. Within the first 600 growing degree days after soybean planting, plant height, leaf area, and dry matter accumulation of hophornbeam copperleaf grown in soybean and alone were similar. Subsequently, leaf area and dry matter accumulation of hophornbeam copperleaf grown alone were greater than of those grown in soybean. In contrast, plant height of hophornbeam copperleaf grown in soybean was greater than when grown alone. Hophornbeam copperleaf grown alone produced up to 12 510 seeds/plant, whereas hophornbeam copperleaf grown with soybean produced 980 seeds/plant. Of 13 postemergent herbicides evaluated on hophornbeam copperleaf in soybean, only lactofen, acifluorfen, and fomesafen controlled 80% or more. Lactofen at 210 g ai/ha consistently controlled more than 95% of the hophornbeam copperleaf.

Keywords

Acifluorfen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acidfomesafen, 5-[2-chloro-4-(trifluoromethyl)phenoxy]-N-(methylsulfonyl)-2-nitrobenzamidelactofen, (±)-2-ethoxy-1-methyl-2-oxoethyl 5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoatehophornbeam copperleaf, Acalypha ostryifolia Riddell # ACCOSsoybean, Glycine max (L.) Merr.Cold stratificationgerminationtemperatureosmotic potentialpHgrowing degree daysthermal timeACCOSCV, coefficient of velocityDAT, days after treatmentGDD, growing degree daysPEG, polyethylene glycol
Type
Research
Information
Weed Technology , Volume 12 , Issue 3 , September 1998 , pp. 515 - 521
Copyright
Copyright © 1998 by the Weed Science Society of America 

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References

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