The purpose of this study is to evaluate various pre-emergent herbicides and their effectiveness in controlling weeds.

2017 Southern Illinois Soybean Pre-Emergent Herbicide Study

In cool, wet conditions, it’s common to see Group 14 PPO injury occur. This injury can be amplified when paired with a Group 2 ALS herbicide. In 2017, t his study was planted in June, which resulted in minimal PPO injury thanks to the warm conditions. Since PPO injury was not a factor, the products that contained a PPO and ALS were some of the highest yielding treatments with the best weed control.

Our multi-year data, however, has shown that Warrant® Ultra has returned the highest yield. Warrant Ultra is a Group 14 and 15, which can result in less injury compared to the other products tested but still provides good weed control. We should always think about using multiple sites of action. Products such as Fierce® XLT, Trivence® and Zidua® Pro all have three sites of action. When activated, these products can offer effective weed control for more than 28 Days After Treatment (DAT). Products with a single site of action typically begin to breakdown before 28 DAT.

2-YEAR PRE-EMERGENT HERBICIDE YIELD AVERAGE

46 DAYS AFTER TREATMENT PERCENT WATERHEMP CONTROL

 Fall: Vertical-Till/In-Line Rip, Spring: Vertical-Till | Herbicides Burndown: 1 qt. Roundup PowerMAX®, 1 qt. Liberty®, 2 qt. Gramoxone® SL 2.0 Post: 1 qt. Roundup PowerMAX® | 

*®XL, Optimum, and AcreMax are registered trademarks of Pioneer. XL® brand seed is distributed by Beck’s Superior Hybrids, Inc.

Sonic®, Zidua® PRO, Warrant® Ultra, Fierce® XLT, Prefix®, Trivence®, Authority® Maxx, Pendant™ 3.3 EC