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Differential Competitiveness of Sulfonylurea Resistant and Susceptible Prickly Lettuce (Lactuca serriola)

Published online by Cambridge University Press:  12 June 2017

Mauricio Alcocer-Ruthling ,
Donald C. Thill  and
Bahman Shafii
Mauricio Alcocer-Ruthling
Affiliation:
Dep. Plant, Soil, Entomol. Sci., Univ. Idaho, Moscow, ID 83843
Donald C. Thill
Affiliation:
Dep. Plant, Soil, Entomol. Sci., Univ. Idaho, Moscow, ID 83843
Bahman Shafii
Affiliation:
Dep. Plant, Soil, Entomol. Sci., Univ. Idaho, Moscow, ID 83843
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Abstract

Repeated use of sulfonylurea herbicides in continuous, no-till winter wheat selected for a herbicide resistant biotype of prickly lettuce in Idaho. Greenhouse experiments were conducted to compare the relative competitiveness and growth rate of sulfonylurea herbicide resistant (R) and susceptible (S) prickly lettuce. The S biotype of prickly lettuce produced 31% more aboveground biomass than the R biotype averaged over all densities. Both biotypes were equally competitive when analyzed for both inter- and intrabiotype competition. In relative growth rate studies, regression analysis showed that the S biotype accumulated biomass 52% faster than the R biotype. The results of this study showed that the S biotype was superior to the R biotype in biomass production and growth rate, but competitiveness appeared to be equal for both biotypes. Other fitness parameters must be measured before fitness differences between biotypes can be determined.

Keywords

Prickly lettuce, Lactuca serriola L. ♯ LACSEwinter wheat, Triticum aestivum L.Competitionfitnessherbicide resistancerelative growth ratesulfonylureaLACSE
Type
Research
Information
Weed Technology , Volume 6 , Issue 2 , June 1992 , pp. 303 - 309
Copyright
Copyright © 1990 by the Weed Science Society of America 

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