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Postemergence Herbicides for Calendula

Published online by Cambridge University Press:  20 January 2017

Frank Forcella*
Affiliation:
North Central Soil Conservation Research Laboratory, U.S. Department of Agriculture–Agricultural Research Service, 803 Iowa Avenue, Morris, MN 56267
Sharon K. Papiernik
Affiliation:
North Central Soil Conservation Research Laboratory, U.S. Department of Agriculture–Agricultural Research Service, 803 Iowa Avenue, Morris, MN 56267
Russ W. Gesch
Affiliation:
North Central Soil Conservation Research Laboratory, U.S. Department of Agriculture–Agricultural Research Service, 803 Iowa Avenue, Morris, MN 56267
*
Corresponding author's E-mail: [email protected]

Abstract

Calendula is an alternative oilseed crop whose seed oil is valued as a substitute for tung oil and a replacement for petroleum-based volatile organic compounds in paints and other coatings. Calendula tolerances to most POST-applied herbicides are unknown. Two POST-applied herbicides were tested for tolerance by calendula. Imazamethabenz at 0.44 kg ai ha−1 plus surfactant and desmedipham plus phenmedipham at 0.36 + 0.36 kg ai ha−1 were tolerated by calendula, but the latter herbicide must be applied after the four–leaf-pair stage of growth to avoid severe injury. Neither herbicide adversely affected calendula seed yield if applied at the four–leaf-pair stage. Because these herbicides can control several weed species, calendula tolerance to them may encourage more growers and crop advisors to test this new oilseed crop on commercial farms.

Calendula officinalis (calendula) es un cultivo oleaginoso alternativo cuyo aceite es valorado como un sustituto del aceite de tung y como remplazo para compuestos volátiles derivados del petróleo usados en pinturas y selladores. La tolerancia de calendula a la mayoría de los herbicidas aplicados POST es desconocida. Se evaluó la tolerancia de calendula a dos herbicidas aplicados POST. Imazamethabenz a 0.44 kg ai ha−1 más surfactante y desmedipham más phenmedipham a 0.36 + 0.36 kg ai ha−1 fueron tolerados por calendula, pero este último tratamiento con herbicidas debe ser aplicado después de que el cultivo ha alcanzado el estado de desarrollo de cuatro pares de hojas para evitar daños severos. Ningún herbicida afectó adversamente el rendimiento de semilla de calendula si la aplicación se hizo en dicho estado de desarrollo. Debido a que estos herbicidas pueden controlar varias especies de malezas, la tolerancia de calendula a ellos puede motivar a más productores y asesores agrícolas a probar este nuevo cultivo oleaginoso en fincas comerciales

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Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: North Central Agricultural Research Laboratory, U.S. Department of Agriculture–Agricultural Research Service, 2923 Medary Avenue, Brookings, SD, 57006.

References

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