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GrainGenes Reference Report: WDS-49-236

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Reference	WDS-49-236
Title	Managing the risks of herbicide resistance in wild oat
Journal	Weed Science
Year	2001
Volume	49
Pages	236-240
Author	Cavan G Cussans J Moss S
Abstract	Summary: A single dominant mutation conferring resistance to aryloxyphenoxypropionate (AOPP) and cyclohexanedione (CHD) herbicides was incorporated into a quantitative model for the population development of wild oat. The model was used to predict the times required to develop field resistance in a number of different scenarios. Field resistance was defined as a threshold of four plants m-2 surviving herbicide treatment, and in most scenarios, a very large proportion of these plants were resistant. The model predicts that plow cultivation could delay the development of resistance relative to tine cultivation. With an initial seed bank of 100 seeds m-2 and annual use of AOPP/CHD herbicides, which kill 90% of susceptible but no resistant plants, field resistance develops in 15 yr with annual tine cultivation 10 cm deep but only after 23 yr with annual plowing 20 cm deep. The model predicts that herbicide rotation can dramatically increase the times required for field resistance to develop in a tine cultivation system. With annual use of AOPP/CHD herbicides, field resistance develops in 15 yr, whereas using alternative modes of action 1 in 2 yr delays field resistance to 28 yr. The model predicts that resistance can be delayed for at least 66 yr if three herbicides, each with a different mode of action, are rotated and each herbicide causes 90% mortality. The model predictions on the number of years required for field resistance to develop are not highly sensitive to the initial density of the seed bank (range modeled = 10(2) to 10(4)), the mutation rate for resistance (10(-4) to 10(-7) per generation), the rate of outcrossing (0.1 to 100%) or the herbicide kill rate (80 to 95%)
Keyword	[ Hide all but 1 of 65 ] 20 80 accase inhibitor aryloxyphenoxypropionate herbicide aryloxyphenoxypropionic herbicides avefa avena fatua biotypes carboxylase inhibitor resistance conferring resistance cultivation cultural control cyclohexanedione cyclohexanedione herbicide density depth development diclofop-methyl dominant dominant mutation evolution field field resistance generation growth retardants herbicide herbicide resistance herbicide resistant weeds herbicide-resistance herbicides increase inheritance ion mechanism mode of action model mortality mutation mutation rate oat oregon outcrossing plowing population population development prediction rare rate resistance resistance management resistant risk risks rotation seed seed banks simulation models single sterilis system tine cultivators weed weed life cycle wild willamette valley

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