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A Method for Identification of Triazine Resistant and Susceptible Biotypes of Several Weeds

Published online by Cambridge University Press:  12 June 2017

J. R. Hensley
J. R. Hensley*
Affiliation:
Agric., Div., CIBA-GEIGY Corp., Vero Beach, Florida 32960
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Abstract

A simple and quick method is described for identifying biotypes of common groundsel (Senecio vulgaris L.), common lambsquarters (Chenopodium album L.), and smooth pigweed (Amaranthus hybridus L.) that are resistant or susceptible to triazine herbicides. Leaf discs (3 mm diam) from the tested plants were vacuum infiltrated with a phosphate medium and exposed to a 3-klux light source. When 1.0 × 10−5M and higher levels of atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) were present, the leaf discs from susceptible biotypes failed to float to the surface, whereas the leaf discs from resistant biotypes floated within 1 h. The urea herbicide, fluometuron [1,1-dimethyl-3-(α,α,α-trifluoro-m-tolyl)urea] inhibited the floating of leaf discs from both the triazine-susceptible and triazine-resistant biotypes. This method can be used to evaluate large numbers of plants to determine if they are resistant or susceptible to triazines without destroying the plants or preventing seed production.

Keywords

Leaf discfluometuronHill reaction
Type
Research Article
Information
Weed Science , Volume 29 , Issue 1 , January 1981 , pp. 70 - 73
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

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