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.

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.

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.

Seed Biology of Sulfonylurea-Resistant and -Susceptible Biotypes of Prickly Lettuce (Lactuca serriola)

1992 ◽  
Vol 6 (4) ◽  
pp. 858-864 ◽  
Author(s):  
Mauricio Alcocer-Ruthling ◽  
Donald C. Thill ◽  
Bahman Shafii
Keyword(s):  
Seed Viability ◽  
Soil Surface ◽  
Seed Longevity ◽  
Herbicide Resistant ◽  
Weed Population ◽  
Seed Biology ◽  
Reproductive Ability ◽  
Lactuca Serriola ◽  
Prickly Lettuce ◽  
Highly Correlated

The persistence of herbicide-resistant biotypes within a given weed population can be highly correlated with the longevity of its seed in the soil and its reproductive ability. This study compared seed longevity of sulfonylurea-susceptible (S) and -resistant (R) biotypes of prickly lettuce in soil at three depths and two locations. Seed longevity in soil was not different between R and S biotypes. Seed longevity was longer when seed were buried compared to seed placed on the soil surface. A field study on seed production showed that prickly lettuce plants produced an average of 14 flower heads and 181 seed per day. Average seed weight was 0.6 mg. No differences were observed in the fecundity or seed viability between the R and S biotypes. However, seed from R biotype plants germinated as fast or faster than seed from S biotype plants.

scholarly journals Monarch butterfly and milkweed declines substantially predate the use of genetically modified crops

2019 ◽  
Vol 116 (8) ◽  
pp. 3006-3011 ◽  
Author(s):  
J. H. Boyle ◽  
H. J. Dalgleish ◽  
J. R. Puzey
Keyword(s):  
Genetically Modified ◽  
Danaus Plexippus ◽  
Genetically Modified Crops ◽  
Monarch Butterfly ◽  
The United States ◽  
Gm Crops ◽  
Herbicide Resistant ◽  
The Past ◽  
Scientific Attention ◽  
Herbicide Use

Monarch butterfly (Danaus plexippus) decline over the past 25 years has received considerable public and scientific attention, in large part because its decline, and that of its milkweed (Asclepias spp.) host plant, have been linked to genetically modified (GM) crops and associated herbicide use. Here, we use museum and herbaria specimens to extend our knowledge of the dynamics of both monarchs and milkweeds in the United States to more than a century, from 1900 to 2016. We show that both monarchs and milkweeds increased during the early 20th century and that recent declines are actually part of a much longer-term decline in both monarchs and milkweed beginning around 1950. Herbicide-resistant crops, therefore, are clearly not the only culprit and, likely, not even the primary culprit: Not only did monarch and milkweed declines begin decades before GM crops were introduced, but other variables, particularly a decline in the number of farms, predict common milkweed trends more strongly over the period studied here.

SULFONYLUREA HERBICIDE RESISTANT WEEDS: DISCOVERY, DISTRIBUTION, BIOLOGY, MECHANISM, AND MANAGEMENT

1991 ◽  
pp. 115-128 ◽  
Author(s):  
Donald C. Thill ◽  
Carol A. Mallory-Smith ◽  
Leonard L. Saari ◽  
Josephine C. Cotterman ◽  
Michael M. Primiani ◽  
...  
Keyword(s):  
Sulfonylurea Herbicide ◽  
Herbicide Resistant

Simultaneous Adoption of Herbicide-Resistant and Conservation-Tillage Cotton Technologies

2006 ◽  
Vol 38 (3) ◽  
pp. 629-643 ◽  
Author(s):  
Roland K. Roberts ◽  
Burton C. English ◽  
Qi Gao ◽  
James A. Larson
Keyword(s):  
Logit Model ◽  
Conservation Tillage ◽  
Bayes Theorem ◽  
Cotton Production ◽  
Herbicide Resistant ◽  
Tillage Practices ◽  
Herbicide Use ◽  
Residual Herbicide ◽  
The Relationship ◽  
Simultaneous Adoption

If adoption of herbicide-resistant seed and adoption of conservation-tillage practices are determined simultaneously, adoption of herbicide-resistant seed could indirectly reduce soil erosion and adoption of conservation-tillage practices could indirectly reduce residual herbicide use and increase farm profits. Our objective was to evaluate the relationship between these two technologies for Tennessee cotton production. Evidence from Bayes' theorem and a two-equation logit model suggested a simultaneous relationship. Mean elasticities for acres in herbicide-resistant seed with respect to the probability of adopting conservation-tillage practices and acres in conservation-tillage practices with respect to the probability of adopting herbicide-resistant seed were 1.74 and 0.24, respectively.

Pollen-Mediated Gene Flow of Sulfonylurea-Resistant Kochia (Kochia scoparia)

Weed Science ◽  
1995 ◽  
Vol 43 (1) ◽  
pp. 95-102 ◽  
Author(s):  
George P. Stallings ◽  
Donald C. Thill ◽  
Carol A. Mallory-Smith ◽  
Bahman Shafii
Keyword(s):  
Gene Flow ◽  
Soil Temperature ◽  
Wind Direction ◽  
Spring Barley ◽  
Growing Season ◽  
Sulfonylurea Herbicide ◽  
Kochia Scoparia ◽  
Herbicide Resistant ◽  
Resistant Trait ◽  
Plot Design

The movement of sulfonylurea herbicide-resistant (R) kochia pollen was investigated in a spring barley field near Moscow, ID, using a Nelder plot design in 1991 and 1992. Each 61 m diameter plot had 16 rays spaced 22.5° apart and contained 211 kochia plants. There were 12 susceptible (S) plants and one R plant along each ray. The R and S plants were 1.5 m and 3.0 to 30.5 m from the center of the plot, respectively. Wind direction and speed in the 16 vectors, air and soil temperature, and rainfall were monitored continuously. Mature kochia seed was collected from individual plants, planted in the greenhouse, and sprayed with chlorsulfuron to test for resistant F1progeny. Results from the 2-yr study showed outcrossing of R pollen onto S plants at rates up to 13.1% per plant 1.5 m from the R plants and declining to 1.4% per plant or less 29 m from the R plants. At least 35% of the total R x S crosses occurred in the direction of prevailing southeastward winds. Predicted percentages of R x S crosses per plant ranged from 0.16 to 1.29 at 1.5 m, and 0.00 to 0.06% at 29 m. Thus, resistant kochia pollen can spread the sulfonylurea-resistant trait at least 30 m during each growing season.

scholarly journals Changes in Herbicide Use after Adoption of HR Canola in Western Canada

2011 ◽  
Vol 25 (3) ◽  
pp. 492-500 ◽  
Author(s):  
S. J. Smyth ◽  
M. Gusta ◽  
K. Belcher ◽  
P. W. B. Phillips ◽  
D. Castle
Keyword(s):  
Environmental Impact ◽  
Active Ingredient ◽  
Weed Management ◽  
Management Practices ◽  
Soil Management ◽  
Western Canada ◽  
Herbicide Resistant ◽  
Production Technologies ◽  
Time Required ◽  
Herbicide Use

This article examines the changes in herbicide use in relation to canola production in Western Canada, comparing 1995 and 2006. The commercialization and widespread adoption of herbicide-resistant (HR) canola has changed weed management practices in Western Canada. Before the introduction of HR canola, weeds were controlled by herbicides and tillage as the leading herbicides at that time required tillage to allow for soil incorporation of the herbicide. Much of the tillage associated with HR canola production has been eliminated as 64% of producers are now using zero or minimum tillage as their preferred form of crop and soil management. Additionally, there have been significant changes regarding the use and application of herbicides for weed control in canola. This research shows that when comparing canola production in 1995 and 2006, the environmental impact of herbicides applied to canola decreased 53%, producer exposure to chemicals decreased 56%, and quantity of active ingredient applied decreased 1.3 million kg. The cumulative environmental impact was reduced almost 50% with the use of HR herbicides. If HR canola had not been developed and Canadian canola farmers continued to use previous production technologies, the amount of active ingredient applied to control weeds in 2007 would have been 60% above what was actually applied.

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