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The Critical Period of Weed Control in White Bean (Phaseolus vulgaris)

Published online by Cambridge University Press:  12 June 2017

Brian L. Woolley ,
Thomas E. Michaels ,
Michael R. Hall  and
Clarence J. Swanton
Brian L. Woolley
Affiliation:
Dep. Crop Sci. Univ. Guelph, Guelph, Ontario, N1G 2W1, Canada
Thomas E. Michaels
Affiliation:
Dep. Crop Sci. Univ. Guelph, Guelph, Ontario, N1G 2W1, Canada
Michael R. Hall
Affiliation:
Dep. Crop Sci. Univ. Guelph, Guelph, Ontario, N1G 2W1, Canada
Clarence J. Swanton
Affiliation:
Dep. Crop Sci. Univ. Guelph, Guelph, Ontario, N1G 2W1, Canada
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Abstract

Field studies were conducted in 1986 and 1987 to determine the critical period for weed control in white bean grown in Ontario. The treatments consisted of either allowing weeds to infest the crop for increasing durations after planting or maintaining plots weed free for increasing durations after planting. The beginning of the critical period was defined as the crop stage by which weed interference reduced yields by 3%. Similarly, the end of the critical period was defined as the crop stage to which the crop had to be weed free to prevent a 3% yield loss. The critical period of weed control occurred between the second-trifoliolate and first-flower stages of growth for all cultivars and years, with the exception of the cultivar ‘OAC Seaforth’ in 1986. The average number of pods per plant for both cultivars was reduced by increasing durations of weed interference after planting in both years. However, pod number of the cultivar OAC Seaforth was reduced at a greater rate in 1986 than ‘Ex Rico 23’. The beginning of the critical period corresponded with the beginning of a rapid increase in total weed biomass.

Keywords

White bean, Phaseolus vulgaris L. ‘OAC Seaforth’ and ‘Ex Rico 23’Navy beansdry beansweed managementweed interference
Type
Weed Biology and Ecology
Information
Weed Science , Volume 41 , Issue 2 , June 1993 , pp. 180 - 184
Copyright
Copyright © 1993 by the Weed Science Society of America 

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