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Effects of Timing and Frequency of Flame Cultivation for Dewberry Control

Published online by Cambridge University Press:  20 January 2017

Katherine M. Ghantous  and
Hilary A. Sandler
Katherine M. Ghantous*
Affiliation:
University of Massachusetts, Amherst Cranberry Station, P.O. Box 569, East Wareham, MA 02538
*
∗Corresponding author's E-mail: [email protected]
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Abstract

Flame cultivation (FC) uses brief exposures of high temperature to control weeds. Three sites in southeastern Massachusetts with dewberry present were studied over a 2-yr period to determine if seasonal timing and frequency of exposure to FC would reduce dewberry stem length and biomass, both in the year of and the year following treatment, and also to evaluate whether FC treatments altered the ratio (sugar : starch) of nonstructural carbohydrates (NSC) in dewberry roots. Dewberry plants were treated with a 9-s exposure to an open-flame hand-held torch at seven different timing regimes (one application in June, July, or August or two applications in June/July, June/August, and July/August, or nontreated). After 1 yr, all treatments showed reduced aboveground dewberry biomass compared to nontreated plots. The timing and frequency of FC treatments were not significant when the weed was growing amongst cranberry vines, but were significant when weeds were treated in the absence of cranberry. Exposure to FC did not affect the ratio of NSC in roots in the year after treatment, indicating that the relative amounts allocated to each type of storage carbohydrate did not differ from nontreated plants, even though the overall amount allocated to root biomass was reduced.

El control con llamas (FC) usa exposiciones a alta temperatura de corta duración para el control de malezas. Tres sitios en el sureste de Massachusetts con presencia de Rubus (Rubus hispidus y Rubus flagellaris) fueron estudiados durante un período de 2 años para determinar si el momento durante la temporada y la frecuencia de exposición a FC reduciría el largo de los tallos y la biomasa de Rubus, en el año del tratamiento y en el año siguiente al tratamiento, y para evaluar si los tratamientos con FC alteraron la proporción (azúcar:almidón) de los carbohidratos no-estructurales (NSC) en las raíces de Rubus. Las plantas de Rubus fueron tratadas con una exposición de 9 s con una antorcha de llama expuesta, sostenida manualmente, con siete regímenes diferentes del momento de aplicación (una aplicación en Junio, Julio, o Agosto, o dos aplicaciones Junio/Julio, Junio/Agosto, y Julio/Agosto, o sin tratamiento). Después de un año, todos los tratamientos mostraron una biomasa aérea reducida de Rubus en comparación con las parcelas sin tratamiento. El momento y la frecuencia de los tratamientos FC no fueron significativos cuando la maleza estaba creciendo entre enredaderas de arándano, pero fueron significativas cuando las malezas fueron tratadas en ausencia de arándano. La exposición a FC no afectó la proporción de NSC en las raíces en el año después del tratamiento, lo que indicó que las cantidades relativas producidas de cada tipo de carbohidrato de almacenaje no difirió de las plantas sin tratamiento, aunque la cantidad total transportada a la raíz fue reducida.

Keywords

Bristly dewberry, Rubus hispidus L. RUHINorthern dewberry, Rubus flagellaris Willd. RUFLAmerican cranberry, Vaccinium macrocarpon AitBramblesflame weedingnonchemical weed managementnonstructural carbohydratesperennial weedsthermal weedingtorches
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 3 , September 2016 , pp. 751 - 757
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Steve Fennimore, University of California, Davis.

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