Hostname: page-component-8448b6f56d-c4f8m Total loading time: 0 Render date: 2024-04-24T01:17:51.735Z Has data issue: false hasContentIssue false
  • English
  • Français

Control of Johnsongrass Ecotypes

Published online by Cambridge University Press:  12 June 2017

C. G. McWhorter
C. G. McWhorter*
Affiliation:
Southern Weed Science Laboratory, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture in cooperation with the Delta Branch, Mississippi Agricultural Experiment Station, Stoneville, Mississippi
Get access Rights & Permissions [Opens in a new window]

Abstract

Field experiments were conducted to study the effectiveness of 2,2-dichloropropionic acid (dalapon) for the control of 55 morphologically distinct ecotypes of johnsongrass (Sorghum halepense (L.) Pers.) collected throughout the United States and from several foreign countries. Ecotypes varied widely in their response to dalapon whether collected from Mississippi, from 10 other states, or from eight foreign countries. Initial control of seven ecotypes with dalapon increased 8 to 35% when nitrogen fertilization was increased from 0 to 300 lb/A. Regrowth of surviving plants was more vigorous with increased nitrogen levels so increased fertility reduced final control. Comparative differences in the susceptibility of the seven selected ecotypes to monosodium methanearsonate (MSMA) were not as great as those obtained with dalapon. Varying the rate of nitrogen fertilization had less effect on johnsongrass susceptibility to MSMA than to dalapon. Dalapon controlled sorghum almum (Sorghum almum Parodi) better than johnsongrass.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 3 , May 1971 , pp. 229 - 233
Copyright
Copyright © 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. Bennett, H. W. 1940. Variations in Johnson and Dallis grass. Proc. Assoc. So. Agr. Workers 31:85–86.Google Scholar
2. Bennett, H. W. 1949. Plant type, disease resistance, and yield variation in johnsongrass. Proc. Assoc. So. Agr. Workers 46:53.Google Scholar
3. Bor, N. L. 1960. The grasses of Burma, Ceylon, India, and Pakistan (excluding Bambuseae) Pergamon Press, London. 767 p.Google Scholar
4. Buchholtz, K. P. 1958. Variations in the sensitivity of quackgrass to dalapon. Proc. North Centr. Weed Contr. Conf. 15:18–19.Google Scholar
5. Casady, A. J. and Anderson, K. L. 1952. Hybridization, cytological, and inheritance studies of a Sorghum cross-Autotetraploid sudangrass × (Johnson grass × 4n sudangrass). Agron. J. 44:189–194.Google Scholar
6. Hadley, H. H. 1953. Cytological relationships between Sorghum vulgare and S. halepense . Agron. J. 45:139–143.Google Scholar
7. Hamilton, K. C. 1964. Response of established clumps of six strains of johnsongrass to repeated applications of dalapon. Western Weed Contr. Conf. Res. Prog. Rept. p. 16–18.Google Scholar
8. Hamilton, K. C. and Tucker, H. 1964. Response of selected and random plantings of johnsongrass to dalapon. Weeds 12:220–222.CrossRefGoogle Scholar
9. Hamilton, K. C. 1969. Repeated, foliar applications of herbicides on johnsongrass. Weed Sci. 17:245–250.Google Scholar
10. Hauser, E. W. and Thompson, J. T. 1959. A study of the absorption and translocation of several chemicals in Johnson grass and an evaluation of their effectiveness for its control under field conditions. Weeds 7:20–33.CrossRefGoogle Scholar
11. Ingle, M. and Rogers, B. J. 1961. The growth of a mid western strain of Sorghum halepense under controlled conditions. Amer. J. Bot. 48:392–396.CrossRefGoogle Scholar
12. McWhorter, C. G. 1966. Toxicity of DSMA to johnsongrass. Weeds 14:191–194.Google Scholar
13. McWhorter, C. G. 1970. Growth and Development of johnsongrass ecotypes. Weed Sci. 18:(In Press).CrossRefGoogle Scholar
14. Mune, T. L. and Parham, J. W. 1956. The declared noxious weeds of Fiji and their control. Fiji Dep. of Agr. Bull. No. 31. 74 p.Google Scholar
15. Rochecouste, E. 1962. Studies on the biotypes of Cynodon dactylon (L.) Pers. II. Growth response to trichloroacetic and 2,2-dichloropropionic acids. Weed Res. 2:136–145.Google Scholar
16. Raman, V. S. and Krishnaswamy, N. 1955. A chromosomal chimera in S. halepense (Linn.). Indian J. Agr. Sci. 25:47–50.Google Scholar
17. Taylorson, R. B. and McWhorter, C. G. 1969. Seed dormancy and germination in ecotypes of johnsongrass. Weed Sci. 17:359–361.CrossRefGoogle Scholar