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Duration of volunteer potato (Solanum tuberosum) interference in bulb onion

Published online by Cambridge University Press:  20 January 2017

Martin M. Williams II ,
Corey V. Ransom  and
W. Mack Thompson
Corey V. Ransom
Affiliation:
Malheur Experiment Station, Oregon State University, 595 Onion Avenue, Ontario, OR 97914
W. Mack Thompson
Affiliation:
Pioneer Hi-bred International Inc., P.O. Box 552, Johnston, IA 50131
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Abstract

Previous research with annual weed species indicates that critical timing of weed removal begins primarily after the two-leaf stage of onion, a time when postemergence (POST) herbicides can first be applied. Volunteer potato is difficult to manage and persists in onion fields of western United States. The purpose of this research was to quantify the duration of volunteer potato interference on yield and market grade of onion as well as potato tuber production. Volunteer potato interference caused a 5% yield loss before onions reached the two-leaf stage, at two of three locations. Relative to weed-free plots, onion bulb diameter was reduced as duration of interference increased, resulting in smaller proportions of marketable bulbs. Volunteer potato produced daughter tubers shortly after emergence, which explains, in part, weed persistence despite removal of shoots with contact herbicides, cultivation, and hand-weeding in onion. Significant losses in onion yield and bulb diameter are likely given current volunteer potato management systems.

Keywords

Volunteer potato, Solanum tuberosum L. ‘Russet Burbank’, ‘Ranger Russet’onion, Allium cepa L. ‘Pinnacle’, ‘Vaquero’Competitioncritical time of weed removalcritical weed-free period
Type
Weed Biology and Ecology
Information
Weed Science , Volume 53 , Issue 1 , February 2005 , pp. 62 - 68
Copyright
Copyright © Weed Science Society of America 

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