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Clomazone for Weed Control in Transplanted Cole Crops (Brassica oleracea)

Published online by Cambridge University Press:  12 June 2017

Jon E. Scott ,
Leslie A. Weston  and
R. Terry Jones
Jon E. Scott
Affiliation:
Dep. of Hortic. and L. Arch., Univ. Kentucky, Lexington, KY 40546
Leslie A. Weston
Affiliation:
Dep. of Hortic. and L. Arch., Univ. Kentucky, Lexington, KY 40546
R. Terry Jones
Affiliation:
Dep. of Hortic. and L. Arch., Univ. Kentucky, Lexington, KY 40546
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Abstract

Experiments were conducted at Lexington and Quicksand, KY, in 1989 and 1990 to determine the effect of preplant incorporated clomazone on weed control, crop injury, and yield of broccoli, cauliflower, green cabbage, red cabbage, and pak choi. Oxyfluorfen and trifluralin were included as standard treatments. Greater than 80% weed control was observed at both locations with 0.8 kg ai ha−1 clomazone, with the exception of smooth pigweed at Lexington. All clomazone treatments caused crop injury 2 WAT. Injury was still evident 8 WAT at clomazone rates of 1.7 and 3.4 kg ha−1, but was minor with rates of 0.8 kg ha−1 or less on broccoli, cauliflower, and red cabbage. Injury was less at Quicksand in both years and seasons over all clomazone rates, most likely due to higher soil organic matter content Yields of broccoli and cauliflower treated with 0.8 kg ha−1 clomazone were similar to yields with oxyfluorfen on a 3% organic matter soil at Lexington in 1989. However, clomazone at 0.8 kg ha−1 at Lexington reduced 1989 spring yields of green cabbage, red cabbage, and pak choi and 1990 spring yields of all cole crops as compared to oxyfluorfen. Clomazone at 0.8 kg ha−1 at Quicksand reduced yield of green cabbage and pak choi in spring 1990 only on a 5.2% organic matter soil. Fall yields of broccoli and cauliflower in both years were not reduced by clomazone at 0.8 kg ha−1 or less at either location. Our studies indicated potential for utilization of clomazone on cole crops in higher organic matter soils, especially if some early season crop injury and occasional yield loss can be tolerated.

Keywords

Clomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinoneoxyfluorfen, 2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzenetrifluralin, 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzenaminesmooth pigweed, Amaranthus hybridus L. #3 AMACHcole crops, Brassica oleracea L. broccoli‘Green Comet,’ cauliflower, ‘Snow Crown,’ green cabbage, ‘Bravo,’ red cabbage, ‘Solid Red hybrid 781,’ pak choi, Brassica campestris L. ‘Joy Choi.’Selectivitydimethazonecrop injury
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 43 , Issue 1 , March 1995 , pp. 121 - 127
Copyright
Copyright © 1995 by the Weed Science Society of America 

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References

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