| Category : Posters (24)
This poster originally appeared at the 2002 Purdue University Spring Fest. It was designed to introduce a diverse audience, including children and parents to Biotechnology. It was designed to be unbiased addressing some of the discussion about biotechnology - Glenn Nice
|Characterization of Three Horseweed (Conyza canadensis) Populations with Different ALS Mutations|
This poster originally appeared at the 2008 NCWSS Annual Meeting. Three mutations have been found in Indiana horseweed/marestail populations that result in ALS tolerance. This poster presents data quantifying the level of ALS resistance conferred by each of the ALS target-site mutations. Greg R. Kruger, Vince M. Davis, Patrick J. Tranel (1), Stephen C. Weller, and William G. Johnson. 1. University of Illinois.
|Corn Yield is Influenced by Nitrogen Fertilizer Timing and Giant Ragweed Interference|
This poster was presented at the Department of Botany and Plant Pathology's student poster contest. It presents data from a study that looked at the interference of giant ragweed in different N fertility regimes - Eric Ott, Bill Johnson, and Reece Dewell.
|Dandelion Control With Spring Applied Treatments in No-Till Soybean|
This poster was presented at the 2003 North Central Weed Science Societies Annual Meeting. This poster presented research on the control of dandelion in soybean that was conducted in part with The Ohio State University - Reece Dewell, Bill Johnson, and Earl Creech.
|Distribution of Stalk Boring Insects in Giant Ragweed in Indiana and Southern Michigan|
This poster was presented at the North Central Weed Science Society's 2004 Annual Meeting. It is on a collaborative research project with Michigan State University identifying the stalk boring insects found in giant ragweed - Eric Ott, William G. Johnson, Corey Gerber, Dana Harder(1), and Christy Sprague(1). 1. Michigan State University.
|Effect of 2,4-D Drift on Roundup-Ready Soybean Yield Components|
This poster was presented at the North Central Weed Science Society's (NCWSS) 2008 Annual Meeting. New trait technologies incorporating 2,4-D tolerance in corn and soybean may result in the greater potential for drift impacts on sensitive non-tolerant soybean and crops. This poster presents data on yield impacts on non-tolerant soybean to simulated drift. Andrew P. Robinson and William G. Johnson.
|Efficacy of Fall and Spring Applied BAS800 on Glyphosate-Resistant Horseweed (Conyza canadensis)|
This poster was presented at the NCWSS Annual Meeting in 2008. It presents results from a study looking at application timing of a new compound from BASF, BAS800, on glyphosate-resistant horseweed (marestail). Glenn R.W. Nice, Vince M. Davis, William G. Johnson, Greg R. Kruger, Bryan G. Young(1), Stevan Z. Knezevic(2), and Troy D. Klingaman(3). 1. Southern Illinois University, Carbondale, IL. 2. University of Nebraska, Concord, NE. 3. BASF Corporation.
|Fall and Spring Development of Soybean Cyst Nematode on Winter Annual Weeds|
This poster won first place in the NCWSS Grad Student Poster Contest in 2005. It reports on research that was conducted to document the distribution of fall and spring SCN development and reproduction on winter weeds in Indiana and to increase our understanding of winter weed management timing to minimize SCN reproduction - J. Earl Creech, William G. Johnson, Bryan G. Young(1), Jared S. Webb(1), Jason P. Bond(1), Mark M. Menke(2), and S. Kent Harrison(2). 1.Southern Illinois University and 2. The Ohio State University
|Frequency and Distribution of Glyphosate-Resistant Horseweed in Indiana|
This poster was presented at the Department of Botany and Plant Pathology's student poster contest. It highlights work surveying the state of Indiana for resistant horseweed and how that information was then provided. For information resulting for these surveys follow this link - Vince Davis, Bill Johnson, and Kevin Gibson.
|Growth and Seed Production of Multiple Glyphosate- and Acetolactate Synthesis-Resistant Horseweed (Conyza canadensis) Biotypes|
Horseweed is a troublesome weed in parts of the mid-west. Populations have both biotypes resistant to glyphosate and ALS herbicides. Multiple resistance has been reported. This poster was presented at the NCWSS annual meeting in 2008 and presented some of Vince's dissertation work comparing the growth and seed production of these biotypes. Vince M. Davis, Greg R. Kruger, and William G. Johnson.
|Indiana Select-A-Herb: a Point in the Right Direction|
This poster was presented at the Weed Science Society of America's annual meeting 2003. It introduced the Indiana Select-A-Herb internet data base. For a chance to use Select-A-Herb follow this link.
|Influence of Stalk Boring Insects on Glyphosate Efficacy on Giant Ragweed|
This poster was originally presented at the Weed Science Society or America's annual meeting in 2004. It discusses greenhouse research results of the influence of stalk boring insects on glyphosate efficacy on giant ragweed - Bill Johnson and Eric Ott.
|Late-Season Weed Escapes in Indiana Soybean|
This poster was presented at the 2005 Weed Science Society of America's Annual Meeting. It presents results of field surveys conducted across Indiana - Bill Johnson, Kevin D. Gibson, Vince M. Davis, and Stephen C. Weller.
|Open-Pollinated Transfer of Glyphosate Resistance in Horseweed (Conyza canadensis) in Greenhouse Isolation|
This poster was presented at the 2008 North Central Weed Science Society's Annual Meeting and won an award for Undergraduate poster. It presents data from a greenhouse study quantifying the potential for glyphosate-resistant horseweed to out cross in open-polinated populations. Ryan S. Henry, Vince M. Davis, and William G. Johnson.
|Response of Field Collected Indiana Giant Foxtail Populations to Glyphosate|
This poster was presented at the NCWSS Annual Meeting in 2008. Giant foxtail is often found in late season field surveys, there is concern that it has developed glyphosate resistance. It presents data from a study that evaluated the response of Indiana giant foxtail populations to glyphosate. Benjamin E. Neild, Paul T. Marquardt, Greg R. Kruger, and William G. Johnson.
|Response of Selected Indiana Horseweed (Conyza canadensis) Population to 2,4-D|
Glyphosate resistance in horseweed has become a large topic in the state of Indiana. This poster was presented at the 2005 NCWSS Annual Meeting and received 2nd place for the Undergraduate Student Poster Contest - Valerie A. Mock, Vince M. Davis, J. Earl Creech, and William G. Johnson.
|Stalk Boring Insects: Glyphosate Efficacy on Infested Giant Ragweed|
This poster was originally presented at the Purdue University's Crop Diagnostic Training and Research Center in 2004. It discusses greenhouse research results on stalk boring insects and how they may influence glyphosate efficacy on infested giant ragweed and future research topics in this area - Eric Ott and Bill Johnson.
|Spatial and Temporal Distribution of Stalk Boring Insects in Indiana and Michigan Giant Ragweed|
This poster was originally presented at the 2005 North Central Weed Science Society's Annual Meeting. It reports on research regarding one of Indiana's most problematic weeds and the effects that stalk boring insects - Eric Ott, Bill Johnson, Corey Gerber, Dana Harder (1), and Chirsty Sprague (1). 1. Michigan State University.
|The Effect of Glyphosate Plus Dicamba Drift Rates on Commercial Processing Tomatoes|
This poster was originally presented at the 2008 NCWSS Annual Meeting. The development of growth regulator tolerant soybean has raised conserns about an increase in cases of drift. This poster presents data from a study that investigated the possibilies of joint activity from glyphosate and dicamba drift on commercial processing tomatoes. Greg R. Kruger, William G. Johnson, and Stephen C. Weller.
|Volunteer Glyphosate-Resistant Corn Control in Roundup Ready Soybeans|
This poster was originally presented at the 2007 North Central Weed Science Society's Annual Meeting. The increased adoption of glyphosate-resistant corn in the Mid-West has been rapid and in some cases volunteer corn in glyphoate-resistant soybean. This poster presents some data in regards to the control of this fairly new weed. - Kevin R. Westerfeld, Vince M. Davis, Melissa M. Kruger, and William G. Johnson, Purdue University
|Winter Annual Weed Influence on Soil Temperature and Soybean Cyst Nematode Population Density|
This poster was presented at the 2008 North Central Weed Science Society's Annual Meeting. It presents information from Val Mock's Masters work on the relationships between soybean cyst nematode and winter annuals. Valerie A. Mock, J. Earl Creech, and William G. Johnson.
|Weed Removal Timings in No-Till, Double-Crop, Glyphosate Resistant Soybean Grown on Claypan Soils|
This poster was presented at the Weed Science Society of America's Annual Meeting in 2004, Kansas City. It reported on research done at University of Missouri. - Reece Dewell, Bill Johnson, Kelly A. Nelson(1), Jainmei Li(3), and Jimmy D. Wait(3). 1. University of Missouri, and 2. University of Missouri.
|The Wonder Down Under|
This poster originally appeared at the 2003, and then at the 2004 Purdue University Spring Fest. It is about the plant world that we don't see, below ground. An introduction to roots, how they work, and some of the uses that we have for them in what we eat - Glenn Nice and John Caveletto
| Category : Slide Presentations (9)
|Assessing the Impact of the Pesticide Applicator Recertification Program in Indiana|
Private pesticide applicators have to be licensed to buy and apply restricted pesticides in the state of Indiana. To maintain their licence, they have to obtain six hours of continuing education in the area of pesticides. Every year a mandatory topic dealing with pesticides is required. This presentation presents information regarding the topic of atrazine use and its use in Indiana. It was presented at the 2005 NCWSS annual meeting - Bill Johnson, Glenn Nice, and Fred Whitford.
|Assessment of the Sustainability of Glyphosate Resistant Cropping Systems - An Alternative Approach|
Glyphosate is the most widely used herbicide in soybean and soon possibly corn. Sustainability of glyphosate is large concern for the people who both use it and sell it. This presentation was presented at the NCWSS 2005 annual meeting - Andrew Westhoven, Bill Johnson, Mark Loux(1), and Jeff Stachler(1). 1. The Ohio State University.
|A Field Survey to Determine the Distribution and Frequency of Glyphosate Resistant Horseweed (Conyza canadensis) in Indiana|
This presentation was given at the 2005 NCWSS Annual meeting. It presents results of a State wide survey that was conducted to determine the scope of the glyphosate resistant horseweed issue - Vince M. Davis, William G. Johnson, and Kevin D. Gibson.
|Crop Rotation and Herbicide Use Influence Population Dynamics of Glyphosate-Resistant Horseweed (Conyza canadensis) in No-Till Crop Management Systems|
Glyphosate-Resistant horseweed (also known as marestail in the Mid-West) has become a troublesome weed in some regions. This presentation provides a small portion of the data that Vince has generated in his dissertation work at Purdue. This long term study has investicated the effects of crop roation and herbicide use on populaitons of glyphosate-resistant horseweed. Vince M. Davis, Kevin D. Gibson, and William G. Johnson.
|Effect of Winter Annual Weed Management on Soybean Cyst Nematode Population and Weed Density|
This presentation was given at the 2008 NCWSS Annual meeting in Indianapolis. This presentation covers some of Valerie's work on the interactions of soybean cyst nematode and winter annual weeds. Valerie A. Mock, J. Earl Creech, and William G. Johnson.
|Glyphosate Efficacy on Giant Ragweed Infested With European Corn Borer|
This presentation was originally presented at the North Central Weed Science Society's annual meeting in 2003. It discusses greenhouse research results of a possible insect-weed-herbicide interaction conducted in 2003 - Eric Ott, Bill Johnson, John Obermeyer, and Dan Childs.
|Impact of Winter Weed Management and Crop Rotation on Winter Annual Weeds and Soybean Cyst Nematode|
This presentation was given at the NCWSS annual meeting in 2005. It presents some of the work being done at Purdue University regarding soybean cyst nematode and alternative hosts that are winter annuals - Bill Johnson and Earl Creech
|Influence of Nitrogen Fertilizer on Giant Ragweed Interference in Corn|
This presentation was given at the North Central Weed Science Society's 2005 annual meeting. It presents research looking at the effects of nitrogen fertilizer timing on giant ragweeds growth. It also touches on nitrogen accumulation in giant ragweed as a component of competition with the crop - Eric Ott and Bill Johnson.
|Soybean Cyst Nematode Development on Purple Deadnettle Under Selected Winter Temperature Regimes|
This presentation was given at the 2005 NCWSS Annual Meeting. It presented results from a study investigating the fate of SCN juveniles inside the roots of purple deadnettle at the onset of winter - J. Earl Creech, William G. Johnson, and Andreas Westphal.
| Category : Video (6)
|Palmer amaranth Seedling ID|
Palmer amaranth seedlings are emerging in Indiana and need to be properly identified. Proper Identification of Palmer amaranth at the seedling stage will allow producers to make timely post-emergence applications and effective control. The characteristic differences between common waterhemp and Palmer amaranth are described.
|How to Effectively use the Corn and Soybean Herbicide Chart|
A review of the layout of the regionally distributed Corn and Soybean Herbicide Chart and how the Purdue Weed Science group is encouraging producers to use the chart to maximize their site of action rotation.
|Identifying Palmer Amaranth in The Field|
This video was shot near Twelve Mile, IN (Cass County) on July 11, at a field heavily infested with Palmer Amaranth. This location allowed us to capture the various growth stages and identifying characteristics of this very aggressive weed. We encourage you to view this video in order to distinguish Palmer from other pigweed species, especially common water hemp. If you think you have found an infestation of Palmer Amaranth in Indiana, take multiple, in-focus, photos of the plant's characteristics outlined in this video along with location information and email to Bill Johnson (email@example.com) or Travis Legleiter (firstname.lastname@example.org). This will help us assess and share the extent of this weed's presence in the state.
|Spots on Corn: Disease or Drift?|
This video shot during the spring in west central Indiana illustrates some points about the similarities and differences of what may have caused leaf spotting on corn leaves. The diagnostic process is presented by Kiersten Wise, Purdue Plant Pathologist, and Travis Legleiter, Purdue Weed Specialist, to better determine the cause for round, necrotic spots on corn leaves, whether Holcus leaf spot or Gramoxone drift. The good news is that minor leaf spotting from either cause will not worsen and is of little concern to the corn field's yield potential.
|YouTube Video: Early Palmer Growth|
This time-lapse video captures the emergence of Palmer amaranth in two
soybean plots during the spring of 2014 in north central Indiana. The
plots present a side-by-side comparison of a full rate of a
pre-emergence residual herbicide against no residual herbicide applied
at planting. The video covers the time from planting until the Palmer
amaranth plants in the non-residual plot reaches 4 to 6 inches in
height, when it would need to be managed with a post-emergence
herbicide. The emergence of the Palmer amaranth and soybean were both
delayed by cool, wet weather, although Palmer amaranth emergence can be
observed rapidly emerging and growing following a rain event on May
28th. The differences between the two plots at the end of the video
highlight the utility of residual herbicides in management of Palmer
|YouTube Video: Late Palmer Growth|
A time-lapse video of Palmer amaranth plants growing during July 2014
was captured in north central Indiana. Palmer amaranth plants can be
observed growing next to a wooden post marked in one-foot increments.
Palmer amaranth plants were tracked at a growth rate over one-inch per