Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-26T06:11:47.819Z Has data issue: false hasContentIssue false
  • English
  • Français

Italian Ryegrass (Lolium multiflorum) Accessions Tolerant to Diclofop

Published online by Cambridge University Press:  12 June 2017

Charles E. Stanger  and
Arnold P. Appleby
Charles E. Stanger
Affiliation:
Malheur Exp. Stn., Ontario, OR 97914
Arnold P. Appleby
Affiliation:
Oregon State Univ., Corvallis, OR 97331
Get access Rights & Permissions [Opens in a new window]

Abstract

In 1987, two applications of the methyl ester of diclofop failed to effectively control Italian ryegrass in some growers' fields. As a result of these observations, studies were initiated to determine if the surviving ryegrass is more tolerant to diclofop than previously untreated ryegrass. Growth chamber studies on five accessions of ryegrass demonstrated that collections from two growers' fields were highly tolerant of diclofop. Diclofop GR50 (rate required to reduce shoot weight by 50%) values of accessions A and B and commercial ryegrass, when diclofop was applied to seedlings at the two-leaf stage, were 2.9, 3.4, and 0.0056 kg ai/ha, respectively. Diclofop-tolerant biotypes were not more tolerant to postemergence barban or preemergence-incorporated triallate plus postemergence diuron or metribuzin. These herbicides are possible alternative treatments in fields where diclofop is no longer effective.

Keywords

Barban, 4-chloro-2-butynyl-3-chlorophenylcarbamatemethyl ester of diclofop, (±)-2-[4-(2,4-dichlorophenoxy)phenoxy] propanoic aciddiuron, N′-(3,4-dichlorophenyl)-N,N-dimethylureametribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triain-5(4H)-onetriallate, S-(2,3,3-trichloro-2-propenyl)bis (1-methylethyl)carbamothioateItalian ryegrass, Lolium multiflorum Lam. ♯3 LOLMUwheat, Triticum aestivum L.Herbicideresistancewheat weed control
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 37 , Issue 3 , May 1989 , pp. 350 - 352
Copyright
Copyright © 1989 by the Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Literature Cited

1. Appleby, A. P., Olson, P. D., and Colbert, D. R. 1976. Winter wheat yield reduction from interference by Italian ryegrass. Agron. J. 68:463–466.Google Scholar
2. Brewster, B. D., Appleby, A. P., and Spinney, R. L. 1977. Control of Italian ryegrass and wild oats in winter wheat with HOE 23408. Agron. J. 69:911–913.Google Scholar
3. Burrill, L. C. and Appleby, A. P. 1978. Influence of Italian ryegrass density on efficacy of diuron herbicide. Agron. J. 70:505–506.Google Scholar
4. Cochran, W. G. 1977. Sampling Techniques. 3rd ed. John Wiley and Sons, New York.Google Scholar
5. Heap, J. and Knight, R. 1982. A population of ryegrass tolerant to the herbicide diclofop methyl. J. Aust. Inst. Agric. Sci. 48:156–157.Google Scholar
6. Khodayari, K., Frans, R. E., and Collins, F. C. 1983. Diclofop—a selective herbicide for Italian ryegrass (Lolium multiflorum) control in winter wheat (Triticum aestivum). Weed Sci. 31:436–438.CrossRefGoogle Scholar
7. LeBaron, H. M. and Gressel, J. 1982. Herbicide resistance in plants. John Wiley and Sons, New York. 401 pp.Google Scholar