Networks
Mohler, Charles Leon
Cornell Academic Staff
Close
Positions
- Senior Research Associate, Crop and Soil Sciences (CSS), College of Agriculture and Life Sciences (CALS)
Charles (Chuck) Mohler joined the Department of Crop and Soil Sciences in 2001 as a Senior Research Associate after 21 years in the Department of Ecology and Evolutionary Biology at Cornell. His research focuses on the ecology of weeds, mechanical and ecologically based weed management and biology of organic cropping systems. He was founder and former Project Coordinator of the Cornell Organic Cropping systems Project, a large multi-experiment, interdisciplinary investigation into the ecology of organic farming (for more information, see www.organic.cornell.edu/ocs/html/index). He is coauthor with Matt Liebman and Charles Staver of the book "Ecological Management of Agricultural Weeds" (Cambridge University Press, 2001). His long-standing interest in the forests of New York State led to the publication in 2006 of the "Guide to the Plant Communities of the Central Finger Lakes Region", co-authored with Peter L. Marks and Sana Gardescu. This book, lavishly illustrated with color photographs, is intended to satisfy the curiosity of both professionals and lay persons interested in where and why different sorts of forests and wetlands occur in central NY. To order copies, see https://www.nysaes.cornell.edu/store/catalog/. Publication of another book "Crop Rotation on Organic Farms: a Planning Manual" (co-edited with Sue Ellen Johnson) was published in 2009. He is an active member of the Weed Science Society of America and several other professional organizations and has taken a leadership role in collaborative multi-state weed projects since 1985. For more information on Charles Mohler, see the Cornell University Weed Ecology Research Laboratory HomePage: http://www.css.cornell.edu/WeedEco/.
Research Areas
- crop management or crop science
- ecology
- environmental sciences
- integrated crop management
- organic agriculture
- plant biology
- soil and crop science
- sustainable agriculture
- weed science
Websites
- Affiliations
- Research
- Publications
- Teaching
- Service
- Background
- Other
- View All
Affiliations
other Cornell affiliations
Research
research overview
- My research interests lie primarily in the areas of weed ecology and sustainable agriculture. Most of my work focuses on the management of organic cropping systems and on the ecology and non-chemical management of agricultural weeds. In addition, I have long standing interests in the biology and management of invasive plants and the composition and management of New York forests.
research activities
co-principal investigator on
area(s) of concentration/expertise
other area(s) of concentration/expertise
- weed science, plant ecology
keywords
- cropping system
- cultivation
- ecology
- invasive plants
- organic
- tillage
- weed
submitted impact statement
Publications
individual publications
-
academic article
- Reduction of weed seedling emergence by pathogens following incorporation of green crop residue.. Weed Research. 52:467-477. 2012
- Economic Performance of Organic Cropping Systems for Vegetables in the Northeast. Journal of Agribusiness. 29:59-82. 2011
- Survival, growth, and fecundity of the invasive swallow-worts (Vincetoxicum spp.) in New York State. Invasive Plant Science and Management. 4:198-206. 2011
- Does polyembryony confer a competitive advantage to the invasive perennial vine Vincetoxicum rossicum (Apocynaceae)?. American Journal of Botany. 97:251-260. 2010
- Establishment of the invasive perennial Vincetoxicum rossicum across a disturbance gradient in New York State, USA. Plant Ecology. 211:65-77. 2010
- Post-dispersal weed seed predation is affected by experimental substrate. . Weed Science. 56:889-895. 2008
- Survival and performance of the invasive vine Vincetoxicum rossicum (Apocynaceae) from seeds of different embryo number under two light environments.. American Journal of Botany. 95:447-453. 2008
- Intraspecific variation in seed characteristics of Powell amaranth (Amaranthus powellii) from habitats with contrasting crop rotation histories. Weed Science. 55:218-226. 2007
- Intraspecific variation in germination response to ammonium nitrate of Powell amaranth (Amaranthus powellii) seeds originating from organic versus conventional vegetable farms. Weed Science. 54:435-442. 2006
- Vertical movement of weed seed surrogates by tillage implements and natural processes. Soil and Tillage Research. 86:110-122. 2006
- Adaptability of plants invading North American cropland. Agriculture, Ecosystems & Environment. 104:379-398. 2004
- Mining the record: historical evidence for climatic influences on maize – Abutilon theophrasti competition. Weed Research. 44:439-445. 2004
- Extending the resource concentration hypothesis to plant communities: effects of litter and herbivores. Ecology. 84:652-665. 2003
- Evaluating seed viability by an unimbibed seed crush test with comparison to the tetrazolium test. Weed Technology. 16:781-786. 2002
- Stale seedbed practices for vegetable production. HortScience. 36:703-705. 2001
- The quantitative relationship between weed emergence and the physical properties of mulches. Weed Science. 48:385-392. 2000
- Effect of Grid Size on Runoff and Soil Moisture for a Variable-Source-Area Hydrology Model. Water Resources Research. 35:3419-3428. 1999
- Scale effects on runoff and moisture content in a GIS-based, variable-source-area hydrology model. Water Resources Research. 35:3419-3428. 1999
- Evaluation of mechanical weed management programs for corn. Weed Technology. 11:123-131. 1997
- Weed seedling emergence and seed survival: Separating the effects of seed position and soil modification by tillage. Weed Research. 37:147-155. 1997
- Ecological bases for the cultural control of annual weeds. Journal of Production Agriculture. 9:468-474. 1996
- Effects of tillage and mulch on weed seed production and seed banks in sweet corn. Journal of Applied Ecology. 32:627-639. 1995
- Error assessment in decision-tree models applied to vegetation mapping. Landscape Ecology. 10:323-335. 1995
- Evaluating the environmental impact of pesticides: a critique of the environmental impact quotient. American Entomologist. 40:180-184. 1994
- A model of the effects of tillage on emergence of weed seedlings. Ecological Applications. 3:53-73. 1993
- Light transmittance, soil temperature, and soil moisture under residue of hairy vetch and rye. Agronomy Journal. 85:673-680. 1993
- Response of weed emergence to rate of Vicia villosa Roth and Secale cereale L. residue. Weed Research. 33:487-499. 1993
- Effects of tillage and mulch on the emergence and survival of weeds in sweet corn.. Journal of Applied Ecology. 29:21-34. 1992
- Effects of tillage and mulch on the emergence and survival of weeds in sweet corn. HortScience. 26:76. 1991
- Effects of tillage and mulch on weed biomass and sweet corn yields. Weed Technology. 5:545-552. 1991
- Energetics and ecosystem integrity: The defining principles of sustainable agriculture. American Journal of Alternative Agriculture. 6:146-149. 1991
- Co-occurrence of oak subgenera: implications for niche differentiation. Bulletin of the Torrey Botanical Club. 117:247-255. 1990
- Seed dispersal and seedling emergence in an old field community in central New York (U.S. A.). Oceologia. 70:92-99. 1986
- Succession after elimination of buried seeds from a recently plowed field. Bulletin of the Torrey Botanical Club. 112:376-382. 1985
- Effect of sampling pattern on estimation of species distribution along gradients. Vegetatio. 54:97-102. 1983
- Measuring compositional change along gradients. Vegetatio. 54:129-141. 1983
- Effects of sample distribution on eigenvector ordination. Vegetatio. 45:141-145. 1981
- Stand structure and allometry of trees during self-thinning of pure stands. Journal of Ecology. 66:599-614. 1978
-
article
- Impact of clover incorporation and ammonium nitrate sidedressing on Illinois Soil Nitrogen Test dynamics over time: 3-year summary 2012
- Impact of clover incorporation on ammonium, nitrate, and ISNT-N over time; 4-year summary. 2012
- Yield and profitability during and after transition in the Cornell organic grain cropping systems experiment 2011
- Fertility effects on the yield of spelt and corn in the Organic Grain Cropping Systems Experiment 2009
- Impact of clover incorporation and ammonium nitrate sidedressing on ammonium, nitrate and Illinois Soil Nitrogen Test dynamics over time 2009
- Is your fertility management creating weed problems? 2009
- Outwitting weeds, part II 2009
- Managing large crabgrass 2008
- Organic management improves soil health: results from the Organic Grain Cropping Systems Experiment 2008
- Organic ridge till vegetables 2008
-
book
-
booksection
- Linking a field map and spreadsheet in Microsoft Excel 2009
- Characteristics of common agricultural weeds relevant to crop rotation 2009
- Characteristics of crops commonly grown in the northeastern U.S.A. 2009
- Crop diseases hosted by common agricultural weeds. 2009
- Crop rotation on organic farms 2009
- Crop sequence problems and opportunities 2009
- What this chapter is about 2009
- Understanding weed biology. In, Organic Vegetable Production 2004
- Ecological principles of sustainable organic systems: an ecologist’s perspective on conventional and organic agriculture 2002
-
chapter
- A crop rotation planning procedure. Crop Rotation on Organic Farms: A Planning Manual. 58-90. 2009
- Crop rotation during the transition from conventional to organic agriculture. Crop Rotation on Organic Farms: A Planning Manual. 91-94. 2009
- Guidelines for intercropping. Natural Resources, Agriculture and Economics Service (NRAES). 95-100. 2009
- Introduction. Crop Rotation on Organic Farms: A Planning Manual. 1-2. 2009
- The role of crop rotation in weed management. Crop Rotation on Organic Farms: A Planning Manual. 44-46. 2009
- Pest Control: Herbaceous Weeds. Agricultural Sciences, from Encyclopedia of Life Support Systems. 2002
- Enhancing the competitive ability of crops. Ecological Management of Agricultural Weeds. 269-231. 2001
- Mechanical management of weeds. Ecological Management of Agricultural Weeds. 139-209. 2001
- Weed evolution and community structure. Ecological Management of Agricultural Weeds. 444-493. 2001
- Weed life history: Identifying vulnerabilities. Ecological Management of Agricultural Weeds. 40-98. 2001
- Weed management: The broader context . Ecological Management of Agricultural Weeds. 494-518. 2001
- Weeds and the soil environment. Ecological Management of Agricultural Weeds. 210-268. 2001
-
conference paper
- Partitioning out the effects of nutrients from composted manure on weeds and crops. . Proceedings of the 66th Annual Meeting of the Northeastern Weed Science Society. 2012
- Crop rotation planning during the transition to organic vegetable production. Mid-Atlantic Fruit and Vegetable Convention, Proceedings, February 1 to 3, 2011, Hershey Lodge and Convention Center, Hershey Pennsylvania. 44-46. 2011
- The role of crop rotation in weed management. Mid-Atlantic Fruit and Vegetable Convention, Proceedings, February 1 to 3, 2011, Hershey Lodge and Convention Cnter, Hershey Pennsylvania. 41-43. 2011
- Important considerations in crop rotation and the new crop rotation manual. Proceedings of the 2009 Empire State Fruit and Vegetable Expo, Syracuse NY, Feb. 11-12, 2009. 131-133. 2009
- What you know about weeds can be used against them. Proceedings of the 2009 Empire State Fruit and Vegetable Expo, Syracuse NY, Feb. 11-12, 2009. 2009
- Evaluating strategies for biomass fuel production in New York State. Proc. 3rd USDA Symp. Greenhouse Gases & Carbon Sequestration in Agriculture and Forestry. 2005
- Weeds and weed management on eleven northeastern organic farms. Proceedings of the 59th Annual Meeting of the Northeastern Weed Science Society. 141. 2005
- Mechanical weed control in oats with a rotary hoe and tine weeder. Proceedings of the Northeastern Weed Science Society. 2-6. 1997
- Scale effects on the simulation of soil water and nitrogen dynamics in steep watersheds. Proc. Joint AGU Chapman-SSSA Outreach Conference. 1997
- Response of a watershed model to varying spatial landscape characteristics. Proc. 2nd Int. Symp. Spatial Accuracy Assessment in Natural Resources and Environmental Science, Gen. Tech. Report #RM-GTR-277. 65-72. 1996
- A living mulch (white clover) / dead mulch (compost) weed control system for winter squash. Proceedings of the Northeastern Weed Science Society. 5-10. 1995
- Controlling weeds in the crop row with cultivators: principles and practice. Proceedings of the 1995 New York State Vegetable Growers Conference. 112-115. 1995
- A comparison of equipment for mechanical weed control in the crop row. Proceedings of the Northeastern Weed Science Society. 65. 1994
- Error assessment in decision-tree models applied to vegetation mapping. International Symposium on the Spatial Accuracy of Natural Resource Data Bases. 1994
- Weed suppression by residue from hairy vetch and rye cover crops. Proceedings of the First International Weed Congress. 516-518. 1992
- Plant community types of the central Finger Lakes Region of New York: a synopsis and key. Proceedings of the Rochester Academy of Science. 55-107. 1991
- Seedling diversity in a New York old field: a partial test of the regeneration niche concept. Program of the IV International Congress of Ecology. 242. 1986
-
document part
- Compost increases weed abundance in an organic grain cropping system.. 59. 2012
- Crop rotation: sequence benefits and problems. 15. 2012
- Germinability of seeds produced at different levels in the canopy varies for two weed species competing with corn. 2012
- Modelling the potential distribution of invasive Ambrosia artemisiifolia in China.. 23. 2012
- New biological information on the invasive swallow-worts (Vincetoxicum spp.). 2012
- Partitioning effects of nutrients from organic amendments on crop and weed growth. 2012
- Responses of weeds and crops to organic nutrient amendments. 23. 2011
- Biomass allocation of pale and black swallow-wort (Vincetoxicum rossicum and V. nigrum) in contrasting competitive environments and water availabilities 2010
- Control of weed size by compost application rate in an organic cropping system 2010
- Heavy fertilization with compost and manure can cause weed problems 2010
- Impact of clover incorporation and ammonium nitrate sidedressing on ammonium, nitrate and Illinois Soil Nitrogen Test dynamics over time 2010
- Planning for flexibility in effective crop rotations 2010
- Reducing tillage in an organic vegetable system: In-row weed control and fertility management. 480. 2010
- Reducing tillage in an organic vegetable system: In-row weed control and fertility management. . 10. 2010
- The Cornell Organic Grain Cropping Systems Experiment: nutrients, yields and net returns through transition and beyond 2010
- Changes in weed vigor and growth in response to carbon: nitrogen ratio manipulation.. 47. 2009
- Effects of varying soil nitrogen fertility levels on weed vigor and growth. 267. 2009
- Manipulation of soil nitrogen levels and its effects on weed vigor and fecundity. 37. 2009
- Pale swallow-wort establishment and survival in four disturbance regimens in central New York State.. 270. 2009
- Vegetative expansion of the invasive swallow-worts in New York State. 240. 2009
- What you know about weeds can be used against them. 178. 2009
- Control of weed size by compost application rate in an organic cropping system 2008
- Manipulation of soil nitrogen levels and its effects on weed vigor and fecundity. 37. 2008
- Pale swallow-wort establishment and survival across four disturbance regimes. 6. 2008
- Pale swallow-wort: It's establishing and expanding. How can we control it? 2008
- The Invasive Swallow-worts: What Do We Know About Their Biology and Management? . 70. 2008
- Does polyembryony confer greater competitive ability in the non-native invasive vine, pale swallow-wort. 5. 2007
- Emergence and performance of two swallow-wort species on soils of varying pH and origin. 12. 2007
- No. 100: Survival and performance of the invasive vine pale swallow-wort (Vincetoxicum rossicum) under two light environments and originating from seeds of different polyembryonic class 2007
- No. 243: Effects of tillage, cultivation, and herbicide rate on spatial aggregation of weeds. 243. 2007
- Clonal expansion and reproductive output of the invasive vine pale swallow-wort in central NY State. 57. 2006
- How many velvetleaf seeds are needed to found a population?. 81. 2006
- Vegetative expansion and seedling fate of swallow-worts (Vincetoxicum spp.), introduced invasive vines in the northeastern U.S.. 16. 2006
- Ecotypic variation in seed characteristics of Powell amaranth from habitats with contrasting crop rotation histories. 142. 2005
- Evaluating Strategies for Biomass Fuel Production in New York State 2005
- A grower friendly web database of weed biology and ecological weed management. 154. 2004
- A method for investigating the influence of soil water potential on weed seed germination. 164. 2004
- Ecotypic variation in germination response of Powell amaranth seeds to ammonium nitrate. 165. 2004
- No. 238: Effect of transgenic Bt corn on post-dispersal weed seed predation in the field. 69. 2004
- Four years of field trials comparing weed suppression by eight varieties of rye. 77. 2003
- Impact of tillage regime and weed management strategy on the abundance of annual and perennial weeds in corn. 76. 2003
- Organic Vegetable Crop Rotation: Expert Management 2003
- Bioassay and field evaluation of rye cultivars for allelopathy. 109-110. 2001
- Frisch Measurement and modeling of depth changes of weed seed surrogates during tillage. 113-114. 2001
- Seed size controls the ability of seedlings to emerge through rye mulch. 98. 2000
- The physical properties of mulches contributing to weed suppression. 95-96. 2000
- The suppression of weeds by nine varieties of rye (Secale cereale). 27-28. 2000
- What does physical weed control really do to weeds? . 94-95. 2000
- Effects of planting depth and simulated crop residue on seed survival of three annual broadleaf weeds. 27-28. 1999
- Physical properties of mulches associated with weed suppression. 166-167. 1999
- Weed seedling emergence and seed survival: separating the effects of vertical position of seeds and soil disturbance. 311. 1996
- Weed seedling emergence and seed survival: separating the effects of vertical position of seeds and soil modification by tillage. 46. 1996
- A comparison of equipment for mechanical weed control in the crop row. 65. 1994
- Fates of seeds subjected to tillage, rye mulch and residual herbicides. 79. 1994
- Light transmittance, soil temperature and soil moisture under residue of hairy vetch and rye 1992
-
report
- Yields and profitability during and after transition in the Cornell Organic Grain Cropping Systems Experiment. 7-11. 2011
- Response of a watershed model to varying spatial landscape characteristics. 65-72. 1996
- Response of a watershed model to varying spatial landscape characteristics. 65-72. 1996
- A forest type classification for New York State based on U.S. Forest Service survey data 1986
- Terrestrial vegetation of the northeastern shore of Lake Erie 1986
-
software
- Nitrogen credits for red clover as cover crop between small grains and corn 2011
- 2010 Production Guide for Organic Lettuce 2010
- 2010 Production Guide for Organic Potatoes 2010
- 2009 Production Guide for Organic Beans for Processing 2009
- 2009 Production Guide for Organic Carrots for Processing 2009
- 2009 Production Guide for Organic Cole Crops 2009
- 2009 Production Guide for Organic Cucumbers and Squash for Processing 2009
- 2009 Production Guide for Organic Peas for Processing 2009
- 2010 Production Guide for Organic Potatoes 2009
- 2010 Production Guide for Organic Spinach 2009
- A Guide to the Plant Communities of the Central Finger Lakes Region 2006
- Reduced tillage vegetable systems 2006
- Mechanical weed control in agriculture 2002
- Cultivation basics for weed control in corn 1997
- Cultivation basics for weed control in corn 1996
- Effects of mature vegetation on seedlings in an old field community: separating aboveground and belowground components 1985
- Weed productivity and composition in pure and mixed crops of barley and field peas 1984
- An analysis of floodplain vegetation of the lower Neches drainage, Southeast Texas, with some considerations on the use of regression and correlation in plant synecology 1979
featured in archived article
speaker at Cornell event
Teaching
teaching overview
- My appointment does not include a teaching component but I regularly contribute to several courses. During 2009 I Contributed two field trips/demonstrations to Introduction to Agricultural Machinery (AGSCI 4940), a 75 min lecture to Weed Ecology and Management (CSS 6140) and a field trip to Practicing Sustainable Land Care (HORT 2200). .
Service
outreach overview
- My extension work is focused on improving organic cropping systems and especially on improving weed management on organic farms. My extension activities fall into four categories: (i) writing books, articles, and websites for farmers, gardeners, extension personnel, and the general public; (ii) presenting field research at farm field days; (iii) speaking at grower conferences and extension workshops; and (iv) answering questions from extension personnel and growers. The nature of the activity varies from year-to-year depending on the current research and writing projects and the interests of stakeholders. Most of my research is directed toward supporting extension activities. I am presently in the process of initiating an on-farm research network in collaboration with Laurie Drinkwater. This is aimed at improving the research capacity of organic growers. Over 120 copies of the draft of a book on ecological weed management have been distributed to extension educators. Nearly all have indicated that they are likely to use information from the book in their extension work. Post-delivery surveys of field days indicate that growers are using the information conveyed on their farms. Impact of talks and workshops has been evaluated by evaluation sheets and pos-delivery surveys, and the responses have been uniformly favorable. Audiences find the information presented useful and applicable to their situations.
service to the profession
- Organic Dairy and Field Crops Program Work Team Member 2007 -
- NE-1026 Technical Committee Member 2005 -
- Organic Vegetables Program Work Team Member 2003 -
- American Society of Agronomy Member 2001 -
- European Weed Research Society Member 1996 -
- European Weed Research Society Member 1996 -
- Weed Science Society of America Member 1988 -
- British Ecological Society Member 1973 -
- British Ecological Society Member 1973 -
- Ecological Society of America Member 1973 -
- International Weed Science Society Member 2001 - 2009
- Weed Science, Associate Editor Professional Honoraries 1999 - 2003
reviewer or editor for
Background
education and training
- Ph.D. in Ecology and Evolutionary Biology, Cornell University 1979
- B.A. in Biology, University of Oregon 1971
awards and honors
Other
college
- CALS
research keyword
- cropping system
- cultivation
- ecology
- invasive plants
- organic
- tillage
- weed
name prefix
- Dr.