2009 North Central Weed Science Society Proceedings

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Weed Biology and Ecology

Weedy Transgenic Volunteer Corn in Corn and the Effect on Corn Root Damage by Western Corn Rootworm. Paul T. Marquardt*, Christian H. Krupke, and William G. Johnson, Purdue University, West Lafayette, IN. (60)

Rate of in situ Shattercane x Sorghum Hybridization. Jared J. Schmidt*, John L. Lindquist, Mark L. Bernards, and Jeff F. Pedersen, University of Nebraska, Lincoln; USDA-ARS, Lincoln, NE. (61)

Investigating the Dissemination of Herbicide Resistance in Waterhemp. Jianyang Liu*, Patrick J. Tranel, and Adam S. Davis, University of Illinois, Urbana; USDA-ARS, Urbana, IL. (62)

Relative Tolerance of Unique Horseweed Populations to 2,4-D. Melissa M. Kruger, Greg R. Kruger, Vince M. Davis, Stephen C. Weller, and William G. Johnson, Purdue University, West Lafayette, IN; University of Illinois, Urbana. (63)

Kochia Differential Response to Glyphosate. Jason Waite* and Kassim Al-Khatib, Kansas State University, Manhattan. (64)

Multitactic Weed Management in Organic Soybean Production Systems . Emily R. Bernstein, David E. Stoltenberg*, Joshua L. Posner, and Janet L. Hedtcke, University of Wisconsin, Madison. (65)

Cover Crop Roller-Crimper Contributes to Weed Management in No-Till Soybean. Adam S. Davis*, USDA-ARS, Urbana, IL. (66)

Increasing Cover Crop Diversity and Weed Suppressiveness of Soils in Organic Cropping Systems. Sam E. Wortman*, John L. Lindquist, Rhae A. Drijber, Mark L. Bernards and Charles A. Francis, University of Nebraska, Lincoln. (67)

Temporal Seed Rain and Dormancy of Field Pennycress and Common Chickweed. Erin C. Taylor*, Karen A. Renner, and Christy L. Sprague, Michigan State University, East Lansing. (68)

Phylogenetic Analysis of the Chenopodium Complex. Sukhvinder Singh* and Patrick J. Tranel, University of Illinois, Urbana, IL. (84)

Asiatic Dayflower Seedling Emergence Pattern in Artificial Seed Banks. José M. Gómez*, and Micheal D.K. Owen, Iowa State University, Ames. (85)

Comparison of Five Common Waterhemp Cohorts: Plant Population Density, Flowering Date, and Contribution to the Soil Seedbank. Chenxi Wu* and Micheal D.K. Owen, Iowa State University, Ames. (86)

Growth Analysis of Glyphosate-Resistant Giant Ragweed Biotypes. Chad B. Brabham* and William G. Johnson, Purdue University, West Lafayette, IN. (87)

Role of Developmental Factors on the Expression of Glyphosate Resistance in Giant Ragweed. Renae R. Robertson*, Burkhard Schulz, and Stephen C. Weller, Purdue University, West Lafayette, IN. (88)

Determination of Water Use Coefficients of Seven Weed Species as Affected by Fraction Transpirable Soil Water Level and Growth Stage. Venkatarao Mannam*, Mark L. Bernards, John L. Lindquist, and Timothy J. Arkebauer, University of Nebraska, Lincoln. (89)

Nitrogen Consumption in Weed Species as Influenced by Application Rate and Weed Removal Timing. Laura E. Bast*, Wesley J. Everman, and Darryl D. Warncke, Michigan State University, East Lansing. (90)

Competitive Effects of Volunteer Corn in Corn. Tye C. Shauck*, and Reid J. Smeda, University of Missouri, Columbia. (91)

Weed Growth in Conventional and Low-Input Crop Rotations. Rachel B. Halbach* and Robert G. Hartzler, Iowa State University, Ames. (92)

Estimated Economic Losses from Early Weed Competition in Wisconsin Corn and Soybean Fields. Nathanael D. Fickett*, Clarissa M. Hammond, David E. Stoltenberg, and Chris M. Boerboom, University of Wisconsin, Madison; Wisconsin Department of Agriculture, Trade, and Consumer Protection, Madison. (93)

Impact of Tillage Induced Multiple Season Degradation of Wolf spiders (Araneae: Lycosidae) Habitat. Randall S. Currie*, Holly N. Davis, Lawrent L. Buschman, and B. Wade French, Kansas State University, Garden City; USDA, Brookings, SD. (94)

Impact of Agricultural Practice on Fungal Associated Seed Decay of Giant Ragweed in Soil. Xianhui Fu*, Joanne Chee-Sanford, Martin M. Williams II, and Adam S. Davis, University of Illinois, Urbana; USDA-ARS, Urbana, IL. (95)