Tables WEED CONTROL - Extension

1 Pub# WS16 / Bulletin 789 / IL15. OHIO STATE UNIVERSITY Extension . Tables Table 1. Table 2. Table 3. weed Response to Burndown Application Intervals for Early Preplant 20. weed Response to Preplant/Preemergence Herbicides in Corn weed . Table 4. Table 5. Table 6. weed Response to Preplant/Preemergence Herbicides in Corn Broadleaf weed Response to Postemergence Herbicides in Corn weed Response to Postemergence Herbicides in Corn Broadleaf 2015 CONTROL . GUIDE. Table 7. Grazing and Forage (Silage, Hay, etc.) Intervals for Herbicide-Treated 66. OHIO, INDIANA. Table 8. Rainfast Intervals, Spray Additives, and Maximum Crop Size for Postemergence Corn AND ILLINOIS. Table 9. Herbicides Labeled for Use on Field Corn, Seed Corn, Popcorn, and Sweet 69.

2 Table 10. Herbicide and soil Insecticide Use Table 11. weed Response to Herbicides in Popcorn and Sweet Corn Table 12. weed Response to Herbicides in Popcorn and Sweet Corn Broadleaf Table 13. weed Response to Preplant/Preemergence Herbicides in Soybeans Table 14. weed Response to Preplant/Preemergence Herbicides in Soybeans Broadleaf Table 15. Grasses and Nutsedge Response to Postemergence Herbicides in 95. Table 16. Broadleaf Weeds Response to Postemergence Herbicides in 96. Table 17. Rainfast Intervals and Spray Additive Recommendations for Postemergence Soybean 128. Table 18. Harvest and Feeding Intervals for Soybean Table 19. weed Response to Postemergence Herbicides in Small 131. Table 20. weed Response to Herbicides in 146. Table 21.

3 weed Response to Herbicides in Grass Pastures/CRP/Grass 164. Table 22. Corn and Soybean Herbicide Premix 181. Table 23. Restrictions on Crop 184. Table 24. Glossary of Glyphosate Products, Including Formulations, Surfactant Recommendations, and 186. Table 25. Glossary of Chemical Names and 187. Indiana Poison CONTROL Centers Indiana Poison Center I-65 at 21st Street 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 Box 6015. Indianapolis, IN 46206-6015. 24 hours: (317) 233-7745 (emergencies only). or by calling Nonemergencies: 800-451-6027.

4 614-292-1607 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.

5 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.

6 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 expression, genetic information, HIV/AIDS status, military status, national origin, race, religion, sex, sexual orientation, or veteran Spill Assistance: For major spills, Illinois law requires that emergency 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).

7 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 and 5 EST Monday through Friday. Inform the operator to dial 614-292-6181. Illinois Emergency Management Agency 12/14 A&B 1-800-782-7860. weed CONTROL Guide for Ohio, Indiana and Illinois Mark M. Loux, Doug Doohan and Anthony F.

8 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 34. 47. Postemergence LibertyLink Postemergence Glyphosate-Resistant Harvest Popcorn and Sweet Corn weed 72. Preplant or 75. Popcorn Harvest Postemergence Attribute Bt11 (glufosinate-resistant) Sweet Postemergence Glyphosate-Resistant Sweet Soybeans Soybean Herbicide Management Strategies.

9 91. Preplant or 97. Postemergence LibertyLink Postemergence Roundup Ready Harvest 126. Small Grains weed Management Strategies for Wheat .. 130. Wheat Oats and 136. Oats and Wheat Underseeded with Wheat: Harvest Figure 1. Wheat Growth Stages and Herbicide Forages Managing Weeds in Legumes ..144. Forage Alfalfa: Preharvest Glyphosate 152. Mixed Grass-Legume Forages: Established Stands Management Strategies for Permanent Grass Pastures/CRP/Grass Hay .. 155. CONTROL of Problem Weeds .. 166. CONTROL of Marestail in No-till Soybeans .. 193. Palmer Amaranth Biology, Identification, and Management .. 197. Poison Information Centers .. 210. Table Listing on Back Cover 1. weed CONTROL Principles Importance of weed CONTROL of herbicides as well as crops, and (2) providing the op- portunity to plant highly competitive crops that prevent weed CONTROL is an essential part of all crop produc- weed establishment.

10 Many herbicides available for use tion systems. Weeds reduce yields by competing with in corn are extremely effective at controlling weeds for crops for water, nutrients, and sunlight, and may directly which there are no adequate controls in soybeans or reduce profits by hindering harvest operations, lowering other crops. Rotation to a densely planted crop such as crop quality, and producing chemicals which are harm- alfalfa or small grains helps CONTROL annual weeds with ful to crop plants (allelopathy). Left uncontrolled, weeds little, if any, chemical input. Rotating to small seeded may harbor insects and diseases and produce seed legumes ( alfalfa) or other densely grown perennial or rootstocks which infest the field and affect future grass-legume forage mixtures is ef fective at reducing crops.