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Factors Influencing the Tolerance of Peas to MCPA

Published online by Cambridge University Press:  12 June 2017

M. L. Weaver  and
R. E. Nylund
M. L. Weaver
Affiliation:
Department of Horticulture, University of Minnesota Washington State University, Pullman
R. E. Nylund
Affiliation:
Department of Horticulture, University of Minnesota
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Abstract

2-Methyl-4-chlorophenoxyacetic acid (MCPA) is widely used to control broad-leaved weeds in pea fields. Occasionally, peas are severely injured by MCPA. This study was conducted in 1959 and 1960 to determine the relationships, if any, of environmental factors and of chemical constituents of plants at the time of spraying to the tolerance of peas to MCPA. Plants were equally susceptible to MCPA at either the 5- or 10-node stages. The time of day at which plants were sprayed appeared to be the most important factor associated with the tolerance of pea to MCPA. Fresh weights of vines and yields of shelled peas from plants sprayed at noon and 4:00 pm were significantly lower than those from unsprayed plants or plants sprayed at other times of the day. The carbohydrate content of pea plants varied with the time of day (exposure to light). The carbohydrate content was associated with susceptibility to injury by MCPA. A high carbohydrate content at the time of spraying was associated with a high degree of susceptibility to MCPA. High temperature at the time of spraying tended to increase the rate of translocation of MCPA. However, in the absence of prolonged exposure to light prior to treatment, high temperature alone did not predispose peas to injury by MCPA.

Type
Research Article
Information
Weeds , Volume 11 , Issue 2 , April 1963 , pp. 142 - 148
Copyright
Copyright © 1963 Weed Science Society of America 

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References

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