Dicamba Effects on Soybean Seed and Off-spring

Excellent article below from Tom Barber, University of Arkansas Extension Weed Scientist

Key Take-Aways

Image courtesy of Arkansas Row Crops: Soybean pod malformation following a drift rate of dicamba

Image courtesy of Arkansas Row Crops: Soybean pod malformation following a drift rate of dicamba

  • the most sensitive stages where yield loss can result from off-target movement of dicama ranges from late vegetative through early reproductive (V6-R2)
  • foliar symptoms are not apparent much past R3 or R4
  • dicamba is no longer being transported to the soybean leaves, but rather is all moving to the sink on the plant, which includes the pods and developing seed
  • late-season soybean exposure to drift rates of dicamba results in the delay in plant maturity
  • late applications have delayed maturity as much as 2-3 weeks over untreated plants
  • germination through standard and accelerated aging tests was greatly reduced as low as 20% for standard and 5% accelerated aging in seeds from parent plants that were treated at R4-R6
  • results were similar for both determinate and indetermine cultivars
  • germination and vigor were greatly reduced at these stages
  • showing dicamba-like symptomology once they emerged in the field the following season
  • when looking at injury to soybean off-spring, the amount or rate of dicamba drift plays a significant role
  • dicamba effects maturity
  • dicamba reduces seed quality
  • dicamba increases pod malformation
  • dicamba increases malformed progeny

Read Full Article Here

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Connie Jeffries