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Efficacy of Colletotrichum coccodes and Thidiazuron for Velvetleaf (Abutilon theophrasti) Control in Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Richard H. Hodgson ,
Lee A. Wymore ,
Alan K. Watson ,
Robert H. Snyder  and
Anne Collette
Richard H. Hodgson
Affiliation:
Foreign Dis.-Weed Sci. Res., ARS, USDA, Ft. Detrick, Bldg. 1301, Frederick, MD 21701
Lee A. Wymore
Affiliation:
Plant Sci. Dep., Macdonald Coll., McGill Univ., Ste.-Anne-de-Bellevue, Quebec, Canada H9X 1C0
Alan K. Watson
Affiliation:
Plant Sci. Dep., Macdonald Coll., McGill Univ., Ste.-Anne-de-Bellevue, Quebec, Canada H9X 1C0
Robert H. Snyder
Affiliation:
Foreign Dis.-Weed Sci. Res., ARS, USDA, Ft. Detrick, Bldg. 1301, Frederick, MD 21701
Anne Collette
Affiliation:
Plant Sci. Dep., Macdonald Coll., McGill Univ., Ste.-Anne-de-Bellevue, Quebec, Canada H9X 1C0
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Abstract

The plant pathogenic fungus Colletotrichum coccodes (Cc) and the plant growth regulator thidiazuron (TDZ) were evaluated in Maryland and Quebec for velvetleaf control in ‘Williams' and ‘Maple Arrow’ soybean. TDZ was applied at 0, 0.1, 0.2, 0.3, and 0.4 kg ai/ha alone or was combined with Cc at 109 spores/m2 when velvetleaf was at the 1- to 2-leaf (Trial 1) or 4- to 6-leaf (Trial 2) growth stages. Velvetleaf control increased with TDZ rate, and TDZ combined with Cc further increased control. TDZ reduced velvetleaf biomass and height, and Cc increased velvetleaf mortality. In Quebec, Cc also reduced the biomass of velvetleaf treated in Trial 1 and interacted positively with TDZ at this growth stage. Cc nearly halved the rates of TDZ required for 90 and 75% mortality of velvetleaf treated at the 1- to 2-leaf and 4- to 6-leaf stages to 0.09 and 0.12 kg/ha, respectively, in Quebec. Cc similarly lowered the rate of TDZ required for 75% stand reduction of velvetleaf in Trial 1 to 0.17 kg/ha in Maryland. Cool wet weather in Quebec contrasted with warm, dry weather in Maryland. Soybean biomass and yield were increased significantly by treatment with TDZ plus Cc in Trial 1 at both locations.

Keywords

Thidiazuron, N-phenyl-N′-1,2,3-thiadiazol-5-yl-ureavelvetleaf, Abutilon theophrasti Medik. # ABUTHsoybean, Glycine max (L.)Merr. ‘Maple Arrow’ and ‘Williams’Colletotrichum, Colletotrichum coccodes (Wallr.)HughesWeed biomassweed mortalityweed biocontrolhost-specific fungal plant pathogengrowth regulatorcrop toleranceintegrated weed managementABUTH
Type
Research
Information
Weed Technology , Volume 2 , Issue 4 , October 1988 , pp. 473 - 480
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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