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Response of Dry Bulb Onion, Sugar Beet, and Pinto Beans to Imazosulfuron Soil Residues

Joel Felix
Weed Technology
Vol. 25, No. 4 (OCTOBER-DECEMBER 2011), pp. 586-590
Stable URL: http://www.jstor.org/stable/41409062
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Response of Dry Bulb Onion, Sugar Beet, and Pinto Beans to Imazosulfuron Soil Residues
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Abstract

Field studies were conducted in 2010 in Ontario, OR, to evaluate the response of direct-seeded dry bulb onion, sugar beet, and pinto beans to imazosulfuron soil residues 12 mo after application to control weeds in potato. The studies were organized as randomized complete block designs with three replications each. Imazosulfuron was applied alone PRE at 224 and 450 g ai ha⁻¹, sequentially at 224 g ha⁻¹ PRE and POST, or in tank mixture with 5-metolachlor 1,060 g ha⁻¹. Very few onion plants emerged in plots previously treated with imazosulfuron at 224 g ha⁻¹ , regardless of timing. Emerged onion plants were severely injured and never matured. No onions emerged from residues of imazosulfuron applied at 450 g ha⁻¹. A few sugar beet plants emerged from 224 g ha⁻¹ but were severely stunted and never grew beyond the first set of leaves. There was no sugar beet emergence from imazosulfuron sequential applications, regardless of the rate and application timing. However, imazosulfuron residues did not affect pinto beans, which emerged and produced marketable yield, similar to grower standard and nontreated plots. The results suggest sensitivity of direct-seeded dry bulb onion and sugar beet, but not pinto beans, to imazosulfuron residues 12 mo after application. En 2010 se realizaron estudios de campo en Ontario, OR, para evaluar la respuesta de la siembra directa de bulbo seco de cebolla, remolacha azucarera y frijol pinto a los residuos en el suelo de imazosulfuron, 12 meses después de su aplicación, para controlar malezas en papa. Los estudios se organizaron con un diseño de bloques completos al azar con tres réplicas cada uno. Imazosulfuron se aplicó solo en PRE a 224 y 450 g ia ha⁻¹ , secuencialmente a 224 g ha⁻¹ en PRE y POST o mezclado en tanque con 5-metolachlor 1,060 g ha⁻¹. Muy pocas plantas de cebolla brotaron en parcelas tratadas previamente con imazosulfuron a 224 g ha" 1 , sin importar el momento de aplicación. Las plantas de cebolla que brotaron fueron dañadas severamente y nunca maduraron. Ninguna cebolla brotó debido a los residuos de imazosulfuron aplicado a 450 g ha⁻¹ . Unas cuantas plantas de remolacha emergieron donde se aplicó el herbicida a 224 g ha⁻¹, pero se retrasaron en el crecimiento severamente y nunca crecieron más allá del primer brote de hojas. No hubo brotes de remolacha azucarera donde se hicieron aplicaciones secuenciales del herbicida, sin importar la dosis y el momento de aplicación. Sin embargo, los residuos de imazosulfuron no afectaron al frijol pinto, el cual emergió y produjo un rendimiento comercial similar a las parcelas estándar de los agricultores y a las no tratadas. Los resultados sugieren, que hay sensibilidad en la siembra directa del bulbo seco de cebolla y de remolacha azucarera a los residuos de imazosulfuron, 12 meses después de la aplicación, pero no así para el frijol pinto.

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