Soybean Variety-Herbicide Management Guide
This guide was developed to provide ratings for tolerance of Pioneer® brand varieties to metribuzin and the PPO herbicides sulfentrazone and saflufenacil. One of four possible ratings is assigned: adequate tolerance, requires careful management, crop response warning and insufficient data. Ratings are based on replicated research trials, marker analysis and or field observations.
ADEQUATE TOLERANCE: With the particular variety, available research and/or field observations suggest this herbicide is unlikely to result in material crop injury under normal circumstances.
REQUIRES CAREFUL MANAGEMENT: With this particular variety, available research and or field observations suggest this herbicide may exhibit crop injury in challenging environments such as heavy rainfall during seed germination or seedling emergence, sandy soils, soils low in organic matter, high pH soils, or during periods of excessively cold, hot, dry, or wet weather.
CROP RESPONSE WARNING: With this variety in field observations and/or research, crop injury has occurred with this herbicide.
|INSUFFICIENT DATA: Additional testing is needed.|
Metribuzin Injury from herbicides containing metribuzin is more prevalent on light, sandy soils or soils low in organic matter. Also, injury is more likely as soil pH increases. Soils that are excessively wet during seed germination and seedling emergence cause greater variety response to this herbicide. Metribuzin is absorbed by roots and foliage. Injury symptoms can include plant stunting, yellowing between the leaf veins and burned tissue on leaf tips. Seedling stand reductions can occur under severe environmental conditions.
Sulfentrazone and Saflufenacil Injury from herbicides containing sulfentrazone or saflufenacil is more prevalent on light, sandy soils or soils with low organic matter. Soils that are excessively wet during seed germination and seedling emergence cause greater variety response to this herbicide. Heavy rainfall during seedling emergence can cause treated soil to splash on hypocotyls, cotyledons and young leaves, sometimes causing tissue burning. Injury symptoms include plant stunting and hypocotyl, cotyledon and leaf tissue speckling or necrosis. Seedling stand reductions can occur under severe environmental conditions.
Management options for varieties with lower tolerance to metribuzin, sulfentrazone or saflufenacil include:
- Read and follow all label instructions and precautions.
- Follow label recommendations closely for light, sandy soils or soils with low organic matter or high pH.
- Avoid soils prone to be excessively wet, or that require a long time to drain or dry.
The purpose of this guide is to assist you in managing herbicide programs with Pioneer® brand soybeans. However, under certain environmental conditions, higher herbicide activity or reduced crop tolerance may occur. In such cases, crop injury may occur on varieties rated as having acceptable tolerance to the herbicide. Environmental conditions are the key factor in variety-herbicide interactions. Pioneer makes no warranty regarding the herbicide crop response information in this guide. If you have further questions, please contact your local Pioneer or herbicide representative for more information.
1RR: Varieties with the original Roundup Ready® (RR) technology are resistant to labeled glyphosate herbicides. This technology allows for post-emergent applications of qlyphosate herbicides without crop injury or stress (see herbicide label). Labeled glyphosate herbicides should only be used over the top of those varieties that carry the Roundup Ready gene designation. NOTE: A soybean variety with a herbicide resistance trait does not confer resistance to all herbicides. Spraying herbicides not labeled for a specific soybean variety will result in severe plant injury or plant death. Always read and follow herbicide label directions.
2STS: Varieties with the Dupont™ STS™ gene (STS) are tolerant to Dupont™ Synchrony® STS™ and Dupont™ Classic® herbicides. This technology allows post-emergent applications of sulfonylureas (see herbicide product labels) without crop injury or stress. NOTE: A soybean variety with a herbicide resistance trait does not confer resistance to all herbicides. Spraying herbicides not labeled for a specific soybean variety will rsult in severe plant injury or plant death. Always read and follow herbicide label directions.
DuPont™ and STS™ are trademarks of DuPont or its affiliates.