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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
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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 

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References

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