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Pea Responses to MCPB Applications At Different Growth Stages¹

‘Alaska’ and ‘New Line Early Perfection’ pea (Pisum sativum L.) varieties responded similarly to 1 pound per acre of 4-(2-methyl-4-chlorophenoxy) butyric acid (MCPB) at comparable growth stages. Low yields of shelled peas were correlated with reduced numbers of pods formed on the lower bloom nodes. Shelled-pea yields of both varieties were not reduced by treatments lnade at least three nodes before initial bloom. MCPB applications during a period commencing two nodes prior to initial bloom and continuing up to pod swelling, reduced shelled-pea yields. Yield reductions were associated with high tenderometer readings, reduced pod numbers, and reduced pea seed numbers per plant.

² Postdoctoral Fellow and Professor, respectively, Department of Agronomy, University of Wisconsin, Madison, Wisconsin.

Received for publication December 18, 1965.