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Use of Gene Flow to Control Diclofop-Methyl Resistance in Italian Ryegrass (Lolium multiflorum)

Published online by Cambridge University Press:  12 June 2017

Claudio M. Ghersa ,
Maria A. Martinez-Ghersa ,
Timothy G. Brewer  and
Mary Lynn Roush
Claudio M. Ghersa
Affiliation:
Dep. Crop Soil Sci., Oregon State Univ., Corvallis, OR 97331
Maria A. Martinez-Ghersa
Affiliation:
Dep. For. Sci., Oregon State Univ., Corvallis, OR 97331
Timothy G. Brewer
Affiliation:
Dep. Crop Soil Sci., Oregon State Univ., Corvallis, OR 97331
Mary Lynn Roush
Affiliation:
Dep. For. Sci., Oregon State Univ., Corvallis, OR 97331
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Abstract

Flower production and pollen dispersal patterns of diclofop-methyl-susceptible and -resistant Italian ryegrass were examined to determine whether evolution of herbicide resistance could be controlled by cross-fertilization between biotypes. The susceptible and resistant ryegrass biotypes differed in timing and abundance of both ovule production and pollen release such that pollen from the susceptible plants had a much greater chance of fertilizing the resistant plant population than vice versa. Susceptible ryegrass, growing with or without wheat competition, produced more than 60% of its seeds before any pollen from resistant plants was released. In contrast, throughout the course of resistant plant seed generation, pollen from susceptible plants composed at least 30% of the total pollen load. These phenological differences, in conjunction with herbicide treatment results for third-generation ryegrass seedlings, suggest that gene flow can be used to reduce development of diclofop-methyl resistance in ryegrass populations within wheat cropping systems. In a wheat field infested with resistant ryegrass, cessation of herbicide application and sowing of a susceptible ryegrass biotype can be expected to reduce the evolution of diclofop-methyl resistance by at least 6% per year.

Keywords

Diclofop, (±)-2-[4-(2, 4-dichlorophenoxy)phenoxy]propanoic acid, methyl esterItalian ryegrass, Lolium multiflorum Lam. # LOLMUwheat, Triticum aestivum L.Fitness studiesweed managementTriticum aestivumLOLMU
Type
Research
Information
Weed Technology , Volume 8 , Issue 1 , March 1994 , pp. 139 - 147
Copyright
Copyright © 1994 by the Weed Science Society of America 

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