Division of Agriculture and Natural Resources
Division of Agriculture and Natural Resources
Division of Agriculture and Natural Resources
University of California
Division of Agriculture and Natural Resources

Dr. Lynn M. Sosnoskie

Photo of Dr Lynn M. Sosnoskie
Agronomy and Weed Science Advisor
UCCE Merced County
2145 Wardrobe Avenue
Merced, CA 95341
lmsosnoskie@ucanr.edu Create VCard

Also in:
Madera County



My name is Lynn Sosnoskie and I recently joined the University of California Cooperative Extension Team as a Agronomy and Weed Science Advisor for Merced and Madera Counties based out of the Merced office.

About me.

I grew up in a small coal mining town in central Pennsylvania. While working on my undergraduate degree,  I became intrigued by plants and plant biology following a Botany class field trip to Longwood Gardens in Kennett Square, PA. Two years later I was lucky enough to secure an internship at that same garden. I worked in the horticulture industry for three years before beginning my master's degree in the field of plant pathology at the University of Delaware. I changed my area of study to weed science while earning my PhD at Ohio State. After graduation, I was a post-doc at the University of Wisconsin – Madison (1 year), a research scientist at the University of Georgia – Tifton (5 years), a project scientist at the University of California – Davis (5 years), and research faculty at the Washington State University Tree Fruit Research and Extension Center – Wenatchee (1 year).

My previous research experiences.

My research experiences have been varied. While doing my PhD, I studied how crop rotations and tillage systems impacted weed community composition in the soil seedbank. At Georgia, I evaluated the efficacy of methyl bromide alternatives for use in fresh market vegetable production systems. I also spent a significant amount of my time studying the biology, ecology, and management of glyphosate-resistant Palmer amaranth (Amaranthus palmeri) in cotton including: pollen movement, seed longevity in the soil, plant regrowth and seed production following failed hand-weeding, and the use of rolled rye cover crops to suppress seedling emergence. While in California, I worked with Brad Hanson to describe the growth and development of glyphosate-resistant junglerice (Echinochloa colona) and hairy fleabane (Conyza bonariensis), research the management of field bindweed (Convolvulus arvensis) in processing tomatoes, and explore the use of pre-emergence herbicides for use in melon production. I only spent a year in Washington, but that time was heavily focused on increasing the presence of the WSU weed science team in the Columbia Basin through extension outreach.

Working with UC Cooperative Extension:

I'm trained as a weed scientist and, as such, will be actively engaged with weed control issues in agronomic crops. Some topics of interest to me include: the spread of herbicide resistant weeds, the preservation of effective chemical control strategies through the judicious use of herbicides and the adoption of non-chemical control practices, automated weeders, the effects of drought on the composition of weed communities, perennial weed management, and improving our understanding of weed biology and ecology to maximize control. With respect to the commodities themselves, I hope to participate in this year's variety trials and am particularly interested in evaluating crop responses to temperature, as well as drought and water quality. I do have training in plant pathology and am interested in the epidemiology and management of diseases, such as Fusarium Race 4 in cotton, that are significant threats to California's agronomic commodities. I also hope to be engaged in collaborative efforts to address a variety of crop issues such as soil salinity and fertility management.

Social media.

I love extension and outreach. And I love photography. And I love to combine the two to disseminate information. You can follow me on Twitter (@SJVAgronWeedSci) and Instagram (agronomyweedscience). I will also be contributing, regularly, to various UC ANR blogs including the Weed Science blog (http://ucanr.edu/blogs/ucdweedscience/).


PhD Weed Science, Ohio State University. 2005
MS Plant Pathology, University of Delaware. 2000
BS Biology, Lebanon Valley College. 1994


Weed Biology, Ecology, and Management

Areas of Expertise (click to see all ANR academics with this expertise)



Peer Reviewed

  • Shrestha, A.S.; deSouza, L.; Yang, P.; Sosnoskie, L.M.; Hanson, B. (2018). Differential tolerance of glyphosate-susceptible and –resistant biotypes of junglerice (Echinochloa colona) to environments during germination, growth, and intra-specific competition. Weed Science. 66, 340-346.
  • Culpepper, A.S.; Sosnsoskie, L.M.; J., Shugart; Leifheit, N.; Curry, M.; Gray, T. (2018). Effects of Low Dose Applications of 2,4-D and Dicamba on Watermelon. Weed Technology. 32, 267-272.
  • Moretti, M.L; Sosnoskie, L.M.; Shrestha, A.; Wright, S.D.; Hembree, K.J.; Jasieniuk, M.; Hanson, B.D. (2016). Distribution of Conyza spp. in Orchards of California and Response to Glyphosate and Paraquat. Weed Science. 64:339-347.
  • Sosnoskie, L.M.; Hanson, B.D. (2016). Field bindweed (Convolvulus arvensis) control in early- and late-planted processing tomatoes. Weed Technology. 30, 708-716.
  • Price, A.J.; Monks, C.D.; Culpepper, A.S.; Duzy, L.M.; Kelton, J.A.; Marshall, M.W.; Sosnoskie, L.M.; Nichols, R.L. (2016). High Residue Cover Crops Alone or with Strategic Tillage to Manage Glyphosate-Resistant Palmer amaranth (Amaranthus palmeri) in Southeastern Cotton (Gossypium hirsutum). Journal of Soil and Water Conservation. 71, 1-11.
  • Sosnoskie, L.M.; Culpepper, A.S.; Braxton, L.B.; Richburg, J.S. (2015). Evaluating the volatility of three formulations of 2,4-D when applied in the field. Weed Technology. 29, 177-184.
  • Gao, S.; Sosnoskie, L.M.; Cabrera, J.A.; Qin, R.; Hanson, B.D.; Gerick, J.S.; Wang, D.; Browne, G.T.; Thomas, J.E. (2015). Fumigation efficacy and emission reduction using low-permeability film in orchard soil fumigation. Pest Management Science. DOI: 10.1002/ps.3993.
  • Sosnoskie, LM; Culpepper, AS (2014). Glyphosate-resistant Palmer amaranth (Amaranthus palmeri) increases herbicide use, tillage, and hand-weeding in Georgia cotton. Weed Science. 62, 393-402.
  • Hanson, B; Wright, S.; Sosnoskie, L.; Fisher, A.; Jasieniuk, M.; Roncoroni, J.; Hembree, K.; Orloff, S.; Shrestha, A.; Al-Khatib, K. (2014). Herbicide resistant weeds challenge signature California cropping systems. California Agriculture. 68, 142-152.
  • Sosnoskie, L.M; Webster, T.M.; Grey, T.L.; Culpepper, A.S. (2014). Severed stems of Amaranthus palmeri are capable of regrowth and seed production in Gossypium hirsutum. Annals of Applied Biology. 165, 147-154.
  • MacRae, AW; Webster, TM; Sosnoskie, LM; Culpepper, AS; Kichler, JM (2013). Cotton yield loss potential in response to length of Palmer amaranth (Amaranthus palmeri) interference. Journal of Cotton Science. 17, 227-232.
  • Fennimore, SA; Hanson, BD; Sosnoskie, LM; Samtami, JB; Datta, A; Knezevic, SZ; Siemens, MC (2013). Field applications of automated weed control: Western hemisphere. Automation: The future of weed control in cropping systems. Springer Inc.
  • Sosnoskie, LM; Webster, TM; Culpepper, AS (2013). Glyphosate resistance does not affect Palmer amaranth (Amaranthus palmeri) seedbank longevity. Weed Science. 61, 283-288.
  • Merchant, RM; Sosnoskie, LM; Culpepper, AS; Steckel, LE; York, AC; Braxton, LB; Ford, JC (2013). Weed response to 2,4-D, 2,4-DB and dicamba applied alone or with glufosinate. Journal of Cotton Science. 17, 212-218.
  • Grey, TL; Cutts, GS; Sosnoskie, LM; Culpepper, AS (2012). Italian ryegrass Lolium perenne) control and Winter Wheat Response to POST Herbicides. Weed Technology. 26, 644-648.
  • Sosnoskie, LM; Webster, TM; MacRae, AW; Grey, TL; Culpepper, AS (2012). Pollen- Mediated Dispersal of Glyphosate-Resistance in Palmer Amaranth under Field Conditions. Weed Science. 60, 366-373.
  • Wallace, RD; Culpepper, AS; MacRae, AW; Sosnoskie, LM (2012). Vegetable Response to EPTC applied preemergence under Low-Density Polyethylene and High Barrier Plastic Mulch. Weed Technology. 26, 54-60.
  • Sosnoskie, LM; Wallace, RD; Kichler, J; Culpepper, AS (2011). Multiple resistances to glyphosate and pyrithiobac in Palmer amaranth in Georgia. Weed Science. 59, 321-325.
  • Wallace, RD; Sosnoskie, LM; Culpepper, AS; York, AC; Edmisten, KL; Patterson, MG; Jones, MA; Crooks, HL; Cloud, GL; Pierson, J (2011). Tolerance of GlyTol™and GlyTol™ + LibertyLink® cotton to glyphosate and glufosinate in the Southeastern U. S. Journal of Cotton Science. 15, 80-88.
  • Culpepper, AS; Webster, TM; Sosnoskie, LM; York, AC (2010). Glyphosate-resistant Palmer amaranth in the United States. Glyphosate resistance in crops and weeds: History, development and management. John Wiley and Sons Inc.
  • Sosnoskie, L.M. (2010). Lespedeza cuneata (Dumont) G. Don. Weeds of the Midwestern United States and Central Canada.C. Bryson and M. Defelice. University of Georgia Press. 219.
  • Webster, TM; Sosnoskie, LM (2010). The loss of glyphosate efficacy: a changing weed spectrum in Georgia cotton. Weed Science. 58, 73-79.
  • Sosnoskie, L.M. (2010). Verbena hastate L. Weeds of the Midwestern United States and Central Canada.C. Bryson and M. Defelice. University of Georgia Press. 305.
  • Sosnoskie, L.M. (2010). Veronica arvensis L. Weeds of the Midwestern United States and Central Canada.C. Bryson and M. Defelice. University of Georgia Press. 289.
  • Sosnoskie, L.M. (2010). Viola bicolor Pursh. Weeds of the Midwestern United States and Central Canada.C. Bryson and M. Defelice. University of Georgia Press. 308.
  • Sosnoskie, LM; Cardina, J (2009). Laboratory methods for breaking dormancy in garlic mustard (Alliaria petiolata) seeds. Invasive Plant Science and Management. 2, 185-189.
  • Sosnoskie, L.M. (2009). Lespedeza cuneata (Dumont) G. Don. Weeds of the South.C. Bryson and M. Defelice. University of Georgia Press. 203.
  • Sosnoskie, LM; Webster, TM; Dales, D; Rains, GC; Grey, TL; Culpepper, AS (2009). Pollen grain size, density and settling velocity for Palmer amaranth (Amaranthus palmeri). Weed Science. 57, 404-409.
  • Sosnoskie, LM; Herms, CP; Cardina, J; Webster, TM (2009). Seedbank and emerged weed communities following adoption of glyphosate-tolerant crops in a long-term tillage and rotation study. Weed Science. 57, 261-270.
  • Sosnoskie, LM; Culpepper, AS; York, AC; Beam, JB; MacRae, AW (2009). Sequential Applications for Mesosulfuron and Nitrogen Needed in Wheat (Triticum aestivum). Weed Technology. 23, 404-407.
  • Sosnoskie, L.M. (2009). Viola bicolor Pursh. Weeds of the South.C. Bryson and M. Defelice. University of Georgia Press. 311.
  • Sosnoskie, LM; Davis, AL; Culpepper, AS (2008). Response of seeded and transplanted summer squash to S-metolachlor applied at planting and POST. Weed Technology. 22, 253-256.
  • Sosnoskie, LM; Luschei, EC; Fanning, MA (2007). Field margin weed species diversity in relation to landscape attributes and adjacent land use. Weed Science. 55, 129-136.
  • Sosnoskie, LM; Herms, CP; Cardina, J (2006). Weed seedbank community composition in a 35-year-old tillage and rotation experiment in Ohio. Weed Science. 54, 263-273.
  • Cardina, J; Sosnoskie, LM; CP, Herms (2003). Seedbank changes following the adoption of glyphosate tolerant crops. Aspects of Applied Biology. 69, 77-81.

Non-Peer Reviewed

  • Sosnoskie, LM (2018). An issue of Pest Management Science is dedicated solely to articles about glyphosate. CWSS Research Update and News. 13, 3-5.
  • Sosnoskie, L.M. (2018). Fall 2018 Agronomy and Weed Science Newsletter.
  • Sosnoskie, L.M. (2018). Smartphone apps to help you identify weeds. Growing Produce. https://www.growingproduce.com/fruits/smartphone-apps-to-help-you-id-weeds/
  • Sosnoskie, L.M. (2018). The current state of herbicide resistance in California. CAPCA Adviser Magazine. October, 76-80.
  • Getts, T; Sosnoskie, L.; Long, R.; Galla, M.; Canevari, M. (2018). What to do with those tough to control perennial weeds in alfalfa? Ag Now Magazine. September, 19-23.

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