title: Aminopyralid soil residues affect rotational vegetable crops in Florida.
abstract: BACKGROUND
  Bahiagrass (Paspalum notatum Flueggé) is a poor host of several soilborne pests of vegetable crops; therefore vegetable crops are commonly grown in a rotation with bahiagrass pastures in Florida. The herbicide aminopyralid provides foliar and soil residual weed control and increases forage production in bahiagrass pastures; however, the soil residual activity of aminopyralid makes carryover injury likely in subsequent sensitive vegetable crops. Field research was conducted to determine the sensitivity of five vegetable crops to soil residues of aminopyralid.
  
  
  RESULTS
  At an aminopyralid soil concentration of 0.2 µg kg(-1) (the limit of quantitation for aminopyralid in this research), crop injury ratings were 48% (bell pepper), 67% (eggplant), 71% (tomato), 3% (muskmelon) and 3% (watermelon), and fruit yield losses (relative to the untreated control) at that concentration were 61, 64, 95, 8 and 14% in those respective crops.
  
  
  CONCLUSIONS
  The crops included in this research were negatively affected by aminopyralid at soil concentrations less than the limit of quantitation (0.2 µg kg(-1) ). Therefore, it was concluded that a field bioassay must be used to determine whether carryover injury will occur when these crops are planted on a site where aminopyralid has been previously applied.
authors.affiliation: Dow AgroSciences, 9330 Zionsville Rd, Indianapolis, IN 46268, USA. BJFast@dow.com
authors.forename: Brandon J
authors.initials: BJ
authors.lastname: Fast
authors.forename: Jason A
authors.initials: JA
authors.lastname: Ferrell
authors.forename: Gregory E
authors.initials: GE
authors.lastname: MacDonald
authors.forename: Brent A
authors.initials: BA
authors.lastname: Sellers
authors.forename: Andrew W
authors.initials: AW
authors.lastname: MacRae
authors.forename: L Jason
authors.initials: LJ
authors.lastname: Krutz
authors.forename: William N
authors.initials: WN
authors.lastname: Kline
mesh_terms: D000383:Agriculture; D005431:Florida; D006540:Herbicides / Q000032:analysis / Q000494:pharmacology*; D031781:Paspalum / Q000187:drug effects / Q000254:growth & development; D010573:Pesticide Residues / Q000032:analysis / Q000494:pharmacology*; D012987:Soil / Q000032:analysis*; D014675:Vegetables / Q000187:drug effects* / Q000254:growth & development*
chemical_list: D006540:Herbicides; D010573:Pesticide Residues; D012987:Soil