W. G. Johnson

Publications82
h-index26
Citations1,561
Highly Influential Citations105
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Competition of Transgenic Volunteer Corn with Soybean and the Effect on Western Corn Rootworm Emergence
Abstract Glyphosate-resistant (GR) volunteer corn has emerged as a problematic weed in corn∶soybean rotational systems, partly because of the rapid increase in adoption of corn hybrids that contain… Expand
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Influence of Weed Management Practices and Crop Rotation on Glyphosate-Resistant Horseweed (Conyza canadensis) Population Dynamics and Crop Yield-Years III and IV
Abstract Horseweed is an increasingly common and problematic weed in no-till soybean production in the eastern cornbelt due to the frequent occurrence of biotypes resistant to glyphosate. The… Expand
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The impact of a fungicide and an insecticide on soybean growth, yield, and profitability
Abstract A growing number of soybean producers have begun to incorporate below threshold fungicide and insecticide treatments into their management programs in attempts to increase yield. The… Expand
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Survey of Tillage Trends Following The Adoption of Glyphosate-Resistant Crops
Abstract A phone survey was administered to 1,195 growers in six states (Illinois, Indiana, Iowa, Mississippi, Nebraska, and North Carolina). The survey measured producers' crop history, perception… Expand
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Glyphosate resistance in Ambrosia trifida: Part 1. Novel rapid cell death response to glyphosate.
BACKGROUND Glyphosate-resistant (GR) Ambrosia trifida is now present in the midwestern United States and in southwestern Ontario, Canada. Two distinct GR phenotypes are known, including a rapid… Expand
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Certified Crop Advisors’ Perceptions of Giant Ragweed (Ambrosia trifida) Distribution, Herbicide Resistance, and Management in the Corn Belt
Abstract Giant ragweed has been increasing as a major weed of row crops in the last 30 yr, but quantitative data regarding its pattern and mechanisms of spread in crop fields are lacking. To address… Expand
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Dose Response of Glyphosate and Dicamba on Tomato (Lycopersicon esculentum) Injury
Abstract Field studies were conducted to determine the response of sublethal glyphosate and dicamba doses to processing tomato flowering loss and marketable yield. Dose–response studies for both… Expand
  • 27
  • 5
Growth and Seed Production of Horseweed (Conyza canadensis) Populations Resistant to Glyphosate, ALS-Inhibiting, and Multiple (Glyphosate + ALS-Inhibiting) Herbicides
Abstract Horseweed populations with mixtures of biotypes resistant to glyphosate and acetolactate synthase (ALS)–inhibiting herbicides as well as biotypes with multiple resistance to glyphosate +… Expand
  • 52
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Fall and Spring Preplant Herbicide Applications Influence Spring Emergence of Glyphosate-Resistant Horseweed (Conyza canadensis)
Abstract Horseweed (Conyza canadensis) is a common weed in no-till crop production systems. It is problematic because of the frequent occurrence of biotypes resistant to glyphosate and acetolactate… Expand
  • 28
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U.S. Grower Views on Problematic Weeds and Changes in Weed Pressure in Glyphosate-Resistant Corn, Cotton, and Soybean Cropping Systems
Abstract Corn and soybean growers in Illinois, Indiana, Iowa, Mississippi, Nebraska, and North Carolina, as well as cotton growers in Mississippi and North Carolina, were surveyed about their views… Expand
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