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Distribution of Triazine-Resistant Smooth Pigweed (Amaranthus hybridus) and Common Lambsquarters (Chenopodium album) in Virginia

Published online by Cambridge University Press:  12 June 2017

William K. Vencill  and
Chester L. Foy
William K. Vencill
Affiliation:
Dep. Plant Pathol., Physiol., and Weed Sci., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
Chester L. Foy
Affiliation:
Dep. Plant Pathol., Physiol., and Weed Sci., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
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Abstract

The distribution pattern of s-triazine-resistant biotypes of common lambsquarters (Chenopodium album L. #3 CHEAL) and smooth pigweed (Amaranthus hybridus L. # AMACH) in Virginia was determined. Seeds were collected from suspected triazine-resistant biotypes of both species. Triazine resistance was confirmed by measuring chlorophyll fluorescence in the presence of atrazine [6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine]. Greenhouse bioassay with whole-plant material and a sinking leaf disc assay were also performed as further confirmation of triazine resistance. Triazine-resistant smooth pigweed was confirmed in 19 counties and common lambsquarters in eight counties in Virginia. Triazine-resistant smooth pigweed and common lambsquarters were located mostly in the northern and southwestern highlands of the state where there has been a long history of triazine use in no-till corn (Zea mays L.) production. S-triazine-resistant biotypes were also cross-resistant to other representative s-triazine and as-triazine herbicides but susceptible to the substituted urea herbicide diuron [N′-(3,4-dichlorophenyl)-N,N-dimethylurea].

Keywords

Herbicide resistanceweed distributionweed surveychlorophyll fluorescencesinking leaf disk assay
Type
Weed Biology and Ecology
Information
Weed Science , Volume 36 , Issue 4 , July 1988 , pp. 497 - 499
Copyright
Copyright © 1988 by the Weed Science Society of America 

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References

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