Salt Flotation Method for Monitoring SWD Larvae in Fruit


This short video demonstrates the salt flotation method for monitoring spotted-wing drosophila (SWD) larvae in fruit.


  • Fruit (6–8 oz.)
  • Bag (1 gallon)
  • Water (1 gallon) + salt (1 cup)
  • Reusable coffee filter
  • Course filter funnel


  • Pour cup of salt into water and stir


  1. Place fruit into bag
  2. Lightly crush fruit in bag
  3. Add salt water solution (let stand 1 hour)
  4. Pour salt water and berry solution over course filter funnel placed on top of disposable coffee filter