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Response of Downy Brome (Bromus tectorum) and Rotational Crops to MON 37500

Published online by Cambridge University Press:  12 June 2017

Sandra L. Shinn ,
Donald C. Thill ,
William J. Price  and
Daniel A. Ball
Sandra L. Shinn
Affiliation:
Department of Plant, Soil, and Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
Donald C. Thill
Affiliation:
Statistical Programs, University of Idaho, Moscow, ID 83844-2339
William J. Price
Affiliation:
Statistical Programs, University of Idaho, Moscow, ID 83844-2339
Daniel A. Ball
Affiliation:
Columbia Basin Agricultural Research Center, Oregon State University, Pendleton, OR 97801
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Abstract

Field experiments were conducted to determine the effect of different rates and application times of MON 37500 on downy brome control in winter wheat and on rotational crop injury. In southeastern Washington, MON 37500 applied postemergence at 36 to 72 g ai/ha in the fall and spring controlled downy brome 90 to 97% and 45 to 71%, respectively. MON 37500 was applied postemergence to winter wheat at 18, 36, and 72 g/ha during fall 1995 and spring 1996 near Moscow, ID; Pendleton, OR; and Endicott, WA, to determine its effect on rotational crops planted during spring 1997. At Pendleton, OR, fall applications of MON 37500 at 18, 36, and 72 g/ha applied to actively growing wheat reduced seed yield of spring barley and pea 13 to 59% and 26 to 29%, respectively, when these crops followed winter wheat in the rotation. At this site, spring applications of 36 and 72 g/ha reduced seed yield of spring barley 17 to 34%; when applied in the fall or spring, MON 37500 reduced canola yield 31 to 73%. MON 37500 at 18 g/ha in the spring reduced pea biomass 32% at Endicott. Aboveground biomass and seed yield of barley, pea, lentil, and mustard at Moscow were not affected by MON 37500 carryover. However, using a grain sorghum bioassay, predicted final concentrations of MON 37500 in soil at all three locations 360 d after treatment (DAT) was similar, ranging from 0.5 to 2 ng ai/g. In growth chamber herbicide dose–response studies, grain sorghum shoot height was reduced more at lower doses (0.025 to 5 ng/g) of MON 37500 in Pendleton soil than in soils from the other field locations. Perhaps the greater rotational crop injury observed at the Pendleton location was partly related to greater soil activity of the herbicide.

Keywords

MON 37500, 1-(2-ethylsulfonylimidazol[1,2-a]pyridin-3-ylsulfonyl)-3-(4,6-dimethoxypyrimidin-2-yl)ureadowny brome, Bromus tectorum L. # BROTEbarley, Hordeum vulgare L. ‘Baronesse'canola, Brassica napus L. ‘Legend'grain sorghum, Sorghum bicolor (L.) Moench ‘DK58'lentil, Lens culinaris Medic. ‘Redchief'mustard, Sinapis alba L. ‘Idagold'pea, Pisum sativum L. ‘Columbia,’ ‘Dual'winter wheat, Triticum aestivum L. ‘Hill,’ ‘Madsen,’ ‘Rod,’ ‘Stephens.'BROTEpHprecipitationsoil residuessorghum bioassaytriasulfuronyieldDAT, days after treatmentOM, organic matterPOST, postemergencePNW, Pacific NorthwestPPI, preplant incorporated

Information

Type
Research
Information
Weed Technology , Volume 12 , Issue 4 , December 1998 , pp. 690 - 698
Copyright
Copyright © 1998 by the Weed Science Society of America 

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