Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-23T00:13:20.775Z Has data issue: false hasContentIssue false
  • English
  • Français

Interaction Between Colletotrichum coccodes and Thidiazuron for Control of Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

L. A. Wymore ,
A. K. Watson  and
A. R. Gotlieb
L. A. Wymore
Affiliation:
Macdonald Coll. of McGill Univ., Ste.-Anne-de-Bellevue, Quebec H9X 1CO
A. K. Watson
Affiliation:
Macdonald Coll. of McGill Univ., Ste.-Anne-de-Bellevue, Quebec H9X 1CO
A. R. Gotlieb
Affiliation:
Univ. Vermont, Burlington 05405
Get access Rights & Permissions [Opens in a new window]

Abstract

Velvetleaf (Abutilon theophrasti Medik. # ABUTH) is difficult to control with existing weed control strategies. Some measure of control can be obtained with a fungus, Colletotrichum coccodes (Wallr.) Hughes, used as a bioherbicide, but when the bioherbicide application was combined with the plant growth regulator thidiazuron (N-phenyl-N′-1,2,3-thidiazol-5-yl-urea), weed control was substantially improved. Thidiazuron alone interfered with normal development of velvetleaf, causing stunting and initiation of axillary bud growth. Tank mix applications of C. coccodes and thidiazuron acted synergistically to increase velvetleaf mortality. When C. coccodes was applied 10 days after thidiazuron as a split application, weed control was less than for tank mix applications. However, two applications of C. coccodes plus thidiazuron were more effective than equivalent single tank mix applications. Under laboratory conditions, high concentrations of thidiazuron (2× field application rates) inhibited growth of C. coccodes, but at field application rates thidiazuron did not reduce disease development. Combinations of thidiazuron and C. coccodes may provide effective control of velvetleaf in the field.

Keywords

Biological weed controlsynergismABUTH
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 35 , Issue 3 , May 1987 , pp. 377 - 383
Copyright
Copyright © 1987 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. Drury, R. E. 1980. Physiological interaction, its mathematical expression. Weed Sci. 28:573–579.CrossRefGoogle Scholar
2. Elstner, E. F., Keller, G., and Paradies, I. 1983. Contrasting effects of the cotton defoliant thidiazuron and aminoethoxyvinylglycine, an inhibitor of ethylene formation, on stomatal aperture and on ethylene formation in bean (Phaseolus vulgaris) leaves. Deutsch. Bot. Ges. 96:459–467.Google Scholar
3. Gotlieb, A. R., Brosseau, M. H., and Watson, A. K. 1984. Colletotrichum coccodes, a pathogen of velvetleaf (Abutilon theophrasti): a potential mycoherbicide. WSSA Abstr. 24:68.Google Scholar
4. Gotlieb, A. R., Watson, A. K., and Poirier, C. 1987. First report of Colletotrichum coccodes on velvetleaf. Plant Dis. 71:281.CrossRefGoogle Scholar
5. Hodgson, R. H. and Snyder, R. H. 1986. Growth modifying effects of thidiazuron on malvaceous weeds and crops. WSSA Abstr. 26:69–70.Google Scholar
6. Horsfall, J. G. and Barratt, R. W. 1945. An improved grading system for measuring plant diseases. Phytopathology 35:655.Google Scholar
7. Mok, M. C., Mok, D.W.S., Armstrong, D. J., Shudo, K., Isogai, Y., and Okamoto, T. 1982. Cytokinin activity of N-phenyl-N'-1,2,3-thiadiazol-5-ylurea (thidiazuron). Phytochemistry 21:1509–1511.CrossRefGoogle Scholar
8. Poirier, C., Gotlieb, A. R., Watson, A. K., and Wymore, L. A. 1985. Colletotrichum coccodes, a mycoherbicide for velvetleaf. Page 651 in Delfosse, E. S., (ed.). Proc. VI Int. Symp. Biol. Control Weeds. Agric. Can., Ottawa.Google Scholar
9. Spencer, N. R. 1984. Velvetleaf, Abutilon theophrasti (Malvaceae), history and economic impact in the United States. Econ. Bot. 38:407–416.CrossRefGoogle Scholar
10. Templeton, G. E., TeBeest, D. O., and Smith, R. J. Jr. 1979. Biological weed control with mycoherbicides. Annu. Rev. Phytopathol. 17:301–310.CrossRefGoogle Scholar
11. Walker, H. L. 1980. Alternaria macrospora as a potential biocontrol agent for spurred anoda. Production of spores for field studies. U.S. Sci. Educ. Admin. Adv. Agric. Tech., Southern Series, No. 12. 5 pp.Google Scholar
12. Yip, W.-K. and Yang, S. F. 1986. Effect of thidiazuron, a cytokinin-active urea derivative, in cytokinin-dependent ethylene production systems. Plant Physiol. 80:515–519.CrossRefGoogle ScholarPubMed