Pub# WS16 / Bulletin 789 / IL15 OHIO STATE UNIVERSITY EXTENSION Tables Table 1. Weed Response to “Burndown” Herbicides .............................................................................................19 Table 2. Application Intervals for Early Preplant Herbicides ............................................................................... 20 Table 3. Weed Response to Preplant/Preemergence Herbicides in Corn—Grasses ....................................30 WEED Table 4. Weed Response to Preplant/Preemergence Herbicides in Corn—Broadleaf Weeds ....................31 Table 5. Weed Response to Postemergence Herbicides in Corn—Grasses ...................................................32 Table 6. Weed Response to Postemergence Herbicides in Corn—Broadleaf Weeds ..................................33 2015 CONTROL Table 7. Grazing and Forage (Silage, Hay, etc.) Intervals for Herbicide-Treated Corn ................................. 66 OHIO, INDIANA Table 8. Rainfast Intervals, Spray Additives, and Maximum Crop Size for Postemergence Corn Herbicides .........................................................................................................................................................68 AND ILLINOIS Table 9. Herbicides Labeled for Use on Field Corn, Seed Corn, Popcorn, and Sweet Corn ..................... 69 GUIDE Table 10. Herbicide and Soil Insecticide Use Precautions ......................................................................................71 Table 11. Weed Response to Herbicides in Popcorn and Sweet Corn—Grasses ............................................73 Table 12. Weed Response to Herbicides in Popcorn and Sweet Corn—Broadleaf Weeds ...........................74 Table 13. Weed Response to Preplant/Preemergence Herbicides in Soybeans—Grasses ...........................93 Table 14. Weed Response to Preplant/Preemergence Herbicides in Soybeans—Broadleaf Weeds .........94 Table 15. Grasses and Nutsedge—Response to Postemergence Herbicides in Soybeans ......................... 95 Table 16. Broadleaf Weeds—Response to Postemergence Herbicides in Soybeans .................................... 96 Table 17. Rainfast Intervals and Spray Additive Recommendations for Postemergence Soybean Herbicides .......................................................................................................................................................128 Table 18. Harvest and Feeding Intervals for Soybean Herbicides .....................................................................129 Table 19. Weed Response to Postemergence Herbicides in Small Grains ....................................................... 131 Table 20. Weed Response to Herbicides in Alfalfa ................................................................................................. 146 Table 21. Weed Response to Herbicides in Grass Pastures/CRP/Grass Hay .................................................. 164 Table 22. Corn and Soybean Herbicide Premix Information ................................................................................. 181 Table 23. Restrictions on Crop Rotation ..................................................................................................................... 184 Table 24. Glossary of Glyphosate Products, Including Formulations, Surfactant Recommendations, and Manufacturers ..................................................................................................186 Table 25. Glossary of Chemical Names and Manufacturers ................................................................................. 187 Indiana Poison Control Centers Indiana Poison Center I-65 at 21st Street P.O. box 1367 Indianapolis, IN 46206-1367 (800) 382-9097 Environmental Emergencies (chemical spills) Indiana Department of Environmental Management Indiana Government Center North 100 North Center Drive Additional copies of this publication can be ordered at P.O. Box 6015 Indianapolis, IN 46206-6015 estore.osu-extension.org 24 hours: (317) 233-7745 (emergencies only) or by calling Nonemergencies: 800-451-6027 614-292-1607 Chem Trek (800) 424-9300 Indiana Pesticide Regulatory Official (including information on Worker Protection Standard WPS) Ohio residents may also order through their county Extension office. Office of the Indiana State Chemist Dept. of Biochemistry Purdue University West Lafayette, IN 47907 (765) 494-1492 or for WPS information (765) 494-1589 Disclaimer The information and suggestions in this publication are intended to provide guidelines for weed management in Ohio in the current calendar year only. Because of changing laws and regulations, Ohio State University Extension assumes no liability for the recommendations. The recommendations for using pesticides included in this guide are incomplete and should not serve as a substitute for pesticide labels. Complete instructions for the use of a specific pesticide are on the pesticide label. The pesticide user is responsible for applying pesticides according to label directions, as well as for problems that may arise through misapplication or misuse of the pesticide. Label changes, product cancellations, and changes in recommendations may have Illinois Poison Control Information occurred since the publication of this guide. Check with your county Extension agent in agriculture if you are in doubt about a pesticide you plan to use. Trade names have been used in this guide for clarity, but do not constitute an endorsement by The Ohio State University, nor do they imply discrimination against other products. National Poison Control Center 1-800-222-1222 Copyright © 2015, The Ohio State University This number will automatically connect you to the center closest to you. Ohio State University Extension embraces human diversity and is committed to ensuring that all research and related educational programs are available to clientele on a nondiscriminatory basis without regard to age, ancestry, color, disability, gender identity or Spill Assistance: For major spills, Illinois law requires that emergency expression, genetic information, HIV/AIDS status, military status, national origin, race, religion, sex, sexual orientation, or veteran status. This statement is in accordance with United States Civil Rights Laws and the USDA. notification be made to the Illinois Emergency Management Agency (IEMA). Keith L. Smith, Associate Vice President for Agricultural Administration; Associate Dean, College of Food, Agricultural, and They in turn notify the appropriate agencies for response. Their 24-hour Environmental Sciences; Director, Ohio State University Extension; and Gist Chair in Extension Education and Leadership. emergency hotline number is: For Deaf and Hard of Hearing, please contact Ohio State University Extension using your preferred communication (e-mail, relay services, or video relay services). Phone 1-800-750-0750 between 8 a.m. and 5 p.m. EST Monday through Friday. Inform the operator to dial 614-292-6181. Illinois Emergency Management Agency 12/14—4.2M—A&B 1-800-782-7860 Weed Control Guide for Ohio, Indiana and Illinois Mark M. Loux, Doug Doohan and Anthony F. Dobbels Department of Horticulture and Crop Science The Ohio State University William G. Johnson, Bryan G. Young and Travis R. Legleiter Department of Botany and Plant Pathology Purdue University Aaron Hager Department of Crop Sciences University of Illinois Contents Weed Control Principles ..............................................................................................................1 Burndown Herbicide Programs for Corn and Soybeans ...................................................... 16 Burndown Herbicides in No-Tillage Corn and Soybeans .........................................................21 Corn Corn Herbicide Management Strategies ...................................................................................28 Preplant or Preemergence ................................................................................................................ 34 Postemergence .................................................................................................................................... 47 Postemergence—LibertyLink Corn ..................................................................................................61 Postemergence—Glyphosate-Resistant Corn ..............................................................................62 Harvest Aid ............................................................................................................................................65 Popcorn and Sweet Corn Weed Management .......................................................................... 72 Preplant or Preemergence ................................................................................................................ 75 Postemergence .....................................................................................................................................81 Popcorn Harvest Aid ...........................................................................................................................89 Postemergence—Attribute Bt11 (glufosinate-resistant) Sweet Corn .......................................89 Postemergence—Glyphosate-Resistant Sweet Corn .................................................................90 Soybeans Soybean Herbicide Management Strategies .............................................................................91 Preplant or Preemergence ...............................................................................................................