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Critical Weed-Control Period in Seeded Cabbage (Brassica oleracea var capitata)

Published online by Cambridge University Press:  12 June 2017

Alan B. Miller  and
Herbert J. Hopen
Alan B. Miller
Affiliation:
Dep. of Hortic., UW-Madison, Madison, WI 53706
Herbert J. Hopen
Affiliation:
Dep. of Hortic., UW-Madison, Madison, WI 53706
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Abstract

The critical weed-control period in field seeded cabbage using natural weed stands was 2 wk in 1988 and 4 wk in 1989. Regression analysis showed that the length of weed-free period, weed density, and ambient light reduction by competing weeds were factors affecting cabbage yield. Weeds that emerged after the initial weed-free period shaded the soil and subsequently lowered soil surface temperatures in 1989. Velvetleaf densities of 1.2 and 3.6 plants per m2 that competed all season with cabbage reduced cabbage yields 52% and 71% of the weed-free treatment in 1988 and 76% and 92% in 1989, respectively. Cabbage yields were reduced at all velvetleaf densities seeded 0, 1, and 2 wk after cabbage, but cabbage yield was not reduced when velvetleaf was seeded 4 or 6 wk after cabbage. Cabbage yield was not different between parallel and staggered velvetleaf configurations at 0.6 plants per m2, but was reduced with longer periods of competition. Velvetleaf seed production was prevented with 6 wk weed-free period after cabbage emergence and subsequent destruction of emerging velvetleaf after cabbage harvest.

Keywords

Cabbage, Brassica oleracea var capitatavelvetleaf, Abutilon theophrasti Medic. ♯ ABUTHCritical weed-control periodweed competitionChenopodium albumAmaranthus retroflexusCapsella bursa-pastorisAMARECHEAL CAPBP
Type
Research
Information
Weed Technology , Volume 5 , Issue 4 , December 1991 , pp. 852 - 857
Copyright
Copyright © 1990 by the Weed Science Society of America 

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