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The Efficiency of Barban as Influenced by Growth Stages of Wild Oats and Spring Wheat

Published online by Cambridge University Press:  12 June 2017

George Friesen
George Friesen*
Affiliation:
University of Manitoba, Winnipeg, Canada
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Abstract

Satisfactory selectivity of 4-chloro-2-butynyl m-chlorocarbanilate (barban) for the control of wild oats (Avena fatua L.) in spring wheat was obtained when it was applied from 4 to 14 days after emergence of wild oats. Following this period, the effectiveness and selectivity declined rapidly. Depending on the season, this period of maximum efficiency represented the following growth stages of wild oats; 1 to 3-leaf stage in 1960, 1½ to 3½-leaf stage in 1961, and 1½ to 2½-leaf stage in 1962. Injury to wheat was most pronounced during a period beginning about 15 days after crop emergence and continuing for several weeks. This pattern of wild oat control and wheat susceptibility was virtually identical over the 3-year period even though growing conditions varied considerably. This suggests that days after emergence may be at least as reliable as leaf stages as an index for the proper timing of barban treatments and would be more easily determined under practical field conditions. If leaf stages are used, then spraying should not be recommended later than 2½-leaf stage, since in some years, wild oats will have reached resistant stages. Furthermore, it may be desirable to apply barban early, perhaps even before all the plants are fully in the 2½-leaf stage. When wild oats reach the 2-leaf stage, it may be too late, at least in years of abundant moisture.

Type
Research Article
Information
Weeds , Volume 15 , Issue 2 , April 1967 , pp. 160 - 162
Copyright
Copyright © 1967 Weed Science Society of America 

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References

Literature Cited

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