Two new (updated) publications are now available to soybean producers. A fact sheet on Metribuzin tolerance and a variety cross-reference guide are linked within this post and also under the publications tab of this blog.
Metribuzin Tolerance Testing of Soybean Varieties – 2014
Metribuzin (Sencor, Canopy, etc.) is a PSII inhibitor (Group 5) herbicide that provides residual control of an assortment of annual grasses and broadleaf weeds in soybean, including Palmer amaranth. With the extensive use of PPO inhibitors (Group 14) and chloroacetamide (Group 15) herbicides in soybean and rotational crops such as corn and cotton, use of an additional mode of action (MOA) is a sound strategy to reduce the risk of resistance to these other herbicide MOAs.
The handicap to metribuzin use is the sensitivity of soybean varieties to this herbicide. Other environmental factors, including: soil texture, organic matter, rainfall, soil pH, and product use rate, may also play a part in sensitivity. The University of Arkansas Division of Agriculture ran a screen of soybean varieties testing their tolerance to metribuzin. The following tables break down into an injury scale: tolerant (<1), slight (1-3), moderate (4-6), severe (7-9), and death (10). Please note that most varieties show an acceptable tolerance to metribuzin. Choose a variety with a high level of tolerance. Continue reading: 2014 Metribuzin Tolerance Factsheet
Cross Reference Guide for Common Soybean Varieties – 2014
Important: Two varieties that are genetically the same may not perform the same side by side in the field due to differences in environmental conditions and management practices among seed increase production fields. How the seed is handled and processed between the time of harvesting in the seed increase field and planting in a grower’s field also influences overall seed quality, which in turn can affect the performance of two varieties that genetically are the same.
Information used to develop this listing was obtained from multiple sources including university and seed company resources. This information was collected at random from regulatory samples, thus not all varieties that are the same as other varieties may be listed. In addition, some varieties listed are no longer sold commercially.
Information contained within this publication was compiled by Jeremy Ross, Assistant Professor/Extension Agronomist – Soybean, University of Arkansas Division of Agriculture. Please contact Jeremy if you have any questions or comments (firstname.lastname@example.org or 501-671-2148). Continue reading: 2014 Soybean Variety Cross Reference Guide