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Row Width Affects Weed Management in Type II Black Bean

  • Ryan C. Holmes (a1) and Christy L. Sprague (a1)


Field studies were conducted in 2010 and 2011 at two locations in Michigan to examine the effect of row width and herbicide combination on weed suppression and yield in the new Type II black bean variety ‘Zorro.' Black bean was planted in 38- and 76-cm rows. Six weed control strategies were examined: S-metolachlor + halosulfuron (PRE), S-metolachlor (PRE) followed by (fb) bentazon + fomesafen (POST), halosulfuron (PRE) fb clethodim (+ fomesafen at one site in one year) (POST), imazamox + bentazon (POST), a weed-free control, and a nontreated control. Weed control and crop injury were evaluated throughout the growing season. In addition, weeds were counted by species in late July, and weed biomass was harvested and weighed at the end of the season. Black bean yield was obtained by direct harvest. Narrow rows reduced weed populations in two of the four site–year combinations (referred to hereafter as site–years), reduced weed biomass in three of the four site–years, and often improved control of upright broadleaf weeds. All herbicide combinations generally reduced weed populations and biomass, but control of specific weeds was variable. Crop injury was generally slight and transient. Yield was greater in narrow rows in two of the four site–years. All herbicide combinations increased yield compared with the nontreated control and resulted in similar yields to one another. Yield and weed suppression was often maximized in narrow rows, while herbicide performance varied by year and weed spectrum.

En 2010 y 2011 se realizaron estudios de campo en dos localidades en Michigan para examinar el efecto de la combinación de distancia entre hileras de siembra y de herbicidas en la supresión de malezas y el rendimiento de la nueva variedad de frijol negro Tipo II 'Zorro'. El frijol negro se sembró en hileras espaciadas a 38 y 76 cm. Se examinaron seis estrategias de control de malezas: S-metolachlor + halosulfuron (PRE), S-metolachlor (PRE) seguido de (fb) bentazon + fomesafen (POST), halosulfuron (PRE) fb clethodim (+ fomesafen en una localidad en un año) (POST), imazamox + bentazon (POST), un testigo libre de malezas, y un testigo no tratado. El control de malezas y el daño al cultivo fueron evaluados a lo largo de la temporada de crecimiento. Adicionalmente, se contó el número de malezas por especie a finales de Julio, y la biomasa de malezas fue cosechada y pesada al final de la temporada. El rendimiento del frijol negro se obtuvo por medio de cosecha directa. Hileras más angostas redujeron las poblaciones de malezas en dos de las cuatro combinaciones de localidad-año (referidas de aquí en adelante como localidad-año), redujeron la biomasa de malezas en tres de los cuatro localidad-año, y frecuentemente mejoraron el control de malezas de hoja ancha de crecimiento erecto. Todas las combinaciones de herbicidas generalmente redujeron las poblaciones y biomasa de malezas, pero el control de malezas específicas fue variable. El daño del cultivo fue generalmente poco y pasajero. El rendimiento fue mayor en hileras angostas en dos de los cuatro localidad-año. Todas las combinaciones de herbicidas incrementaron el rendimiento en comparación con el testigo no tratado y resultaron en rendimientos similares entre sí. El rendimiento y la supresión de malezas fueron frecuentemente maximizados en hileras angostas, mientras que el desempeño de los herbicidas varió según el año y el espectro de malezas.


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Row Width Affects Weed Management in Type II Black Bean

  • Ryan C. Holmes (a1) and Christy L. Sprague (a1)


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