scholarly journals Recent spread of Lactuca serriola (prickly lettuce) noted in Glasgow during 2017

2019 ◽  
Vol 27 (1) ◽  
pp. 75-76
Author(s):  
M. Philip
Keyword(s):  
Lactuca Serriola ◽  
Prickly Lettuce

Monitoring the Occurrence of Sulfonylurea-Resistant Prickly Lettuce (Lactuca serriola)

1992 ◽  
Vol 6 (2) ◽  
pp. 437-440 ◽  
Author(s):  
Mauricio Alcocer-Ruthling ◽  
Donald C. Thill ◽  
Carol Mallory-Smith
Keyword(s):  
Sulfonylurea Herbicide ◽  
Herbicide Resistant ◽  
Lactuca Serriola ◽  
Prickly Lettuce ◽  
Herbicide Use

Sulfonylurea herbicide-resistant prickly lettuce was discovered in Idaho in 1987. The objectives of these surveys were to determine the change with time in the proportion of sulfonylurea resistant and susceptible prickly lettuce biotypes on the farm where it originally occurred, and to determine the spread of sulfonylurea resistant prickly lettuce beyond its point of origin. On average, the proportion of resistant plants had decreased from 1988 to 1990, a period when sulfonylurea herbicide use was discontinued on the farm. Resistant prickly lettuce plants were found at seven sites away from the original infested farm. Several sites were near the farm along roadsides that had been sprayed with sulfometuron. This study shows that the proportion of resistant prickly lettuce decreased where previously found, but its range increased.

Resistance of a Prickly Lettuce (Lactuca serriola) Biotype to 2,4-D

2009 ◽  
Vol 23 (4) ◽  
pp. 586-591 ◽  
Author(s):  
Ian C. Burke ◽  
Joseph P. Yenish ◽  
Dennis Pittmann ◽  
Robert S. Gallagher
Keyword(s):  
Dose Response ◽  
Lactuca Serriola ◽  
Prickly Lettuce

Dose-response experiments were conducted on a biotype of prickly lettuce collected from Whitman County, WA, to determine the level of resistance to 2,4-D. Initially, progeny of prickly lettuce that survived two applications of glyphosate and 2,4-D in mixture were collected to determine if antagonism of the 2,4-D or glyphosate was occurring. Prickly lettuce survival was determined to not be due to antagonism of 2,4-D or glyphosate when the two herbicides were applied in mixture. The doses required to reduce growth 50% (GR50) for resistant and susceptible field-collected prickly lettuce were 150 and 6 g ae/ha 2,4-D, respectively, indicating the resistant biotype was 25 times more resistant to 2,4-D than the susceptible biotype. The resistant biotype expressed injury but produced regrowth following application. A dose of 2,4-D at 220 g/ha was required to reduce regrowth frequency 50% (FR50) for resistant field-collected prickly lettuce. Regrowth was also observed with the susceptible biotype, although the FR50 was much lower (10 g/ha), resulting in an R/S ratio of 22 based on the respective FR50 values. A rate of 4,300 g/ha 2,4-D (10 times the maximum labeled rate in wheat) was required to reduce the regrowth frequency in the resistant biotype to zero.

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

1992 ◽  
Vol 6 (2) ◽  
pp. 303-309 ◽  
Author(s):  
Mauricio Alcocer-Ruthling ◽  
Donald C. Thill ◽  
Bahman Shafii
Keyword(s):  
Growth Rate ◽  
Sulfonylurea Herbicides ◽  
Sulfonylurea Herbicide ◽  
Relative Growth ◽  
Herbicide Resistant ◽  
Lactuca Serriola ◽  
No Till ◽  
Fitness Parameters ◽  
Repeated Use ◽  
Prickly Lettuce

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.

Lactuca serriola (Prickly lettuce)

2019 ◽  
pp. 1336-1338
Author(s):  
K. Subramanya Sastry ◽  
Bikash Mandal ◽  
John Hammond ◽  
S. W. Scott ◽  
R. W. Briddon
Keyword(s):  
Lactuca Serriola ◽  
Prickly Lettuce

Identification of Sulfonylurea Herbicide-Resistant Prickly Lettuce (Lactuca serriola)

1990 ◽  
Vol 4 (1) ◽  
pp. 163-168 ◽  
Author(s):  
Carol A. Mallory-Smith ◽  
Donald C. Thill ◽  
Michael J. Dial
Keyword(s):  
Sulfonylurea Herbicides ◽  
Sulfonylurea Herbicide ◽  
Wheat Field ◽  
Herbicide Resistant ◽  
Lactuca Serriola ◽  
Naturally Occurring ◽  
No Till ◽  
Prickly Lettuce ◽  
Sites Of Action ◽  
Imidazolinone Herbicides

A naturally occurring prickly lettuce biotype resistant to a 5:1 formulated mixture of chlorsulfuron:metsulfuron (DPX-G8311) was identified in a no-till winter wheat field near Lewiston, ID, in April, 1987. Field and greenhouse studies were established to evaluate its resistance to other sulfonylureas, imidazolinones, and herbicides with alternate sites of action. The resistant biotype resisted eight sulfonylurea herbicides; resisted the imidazolinone herbicides, imazapyr and imazethypyr, but not imazaquin; and resisted no other herbicides included in the studies. The resistant biotype was identified in seven of nine fields on the farm where it was discovered.

scholarly journals Incidence of lettuce downy mildew (Bremia lactucae) and powdery mildew (Golovinomyces cichoracearum) in natural populations of prickly lettuce (Lactuca serriola)

2013 ◽  
Vol 49 (Special Issue) ◽  
pp. S24-S32 ◽  
Author(s):  
B. Mieslerová ◽  
A. Lebeda ◽  
I. Petrželová ◽  
P. Korbelová
Keyword(s):  
Czech Republic ◽  
Powdery Mildew ◽  
Downy Mildew ◽  
Natural Infection ◽  
Bremia Lactucae ◽  
The Czech Republic ◽  
Lettuce Downy Mildew ◽  
Lactuca Serriola ◽  
Golovinomyces Cichoracearum ◽  
Prickly Lettuce

The study was focused on the wild pathosystem Lactuca serriola–lettuce downy mildew (Bremia lactucae) and lettuce powdery mildew (Golovinomyces cichoracearum). Observations were focused mainly on recording natural infection of prickly lettuce (Lactuca serriola) by downy and powdery mildews in the East Bohemia and Moravia (the Czech Republic) in the May–September period of 2007–2011, and on the influence of environmental conditions on disease incidence. Only data for July and August were used for the detailed comparisons of occurrence of both pathogens, because intensity of disease in this period was the highest. Data were linked with the average monthly temperature and rainfall rate in the Czech Republic. G. cichoracearum prefers rather low levels of precipitation and temperatures around 20°C, therefore significantly higher incidence of this pathogen was recorded in August 2007. On the other hand in July 2009 and 2010, when the intensities of precipitation were higher, incidence of Bremia lactucae prevailed. In August 2010 and 2011 incidence of both pathogens were more or less similar at all locations. Our observations showed that climatic conditions influence the incidence and prevalence of both pathogens in weedy growing populations of Lactuca serriola.

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