Modeling Remobilization of Neonicotinoid Residues from Tree Foliage in Streams-A Relevant Exposure Pathway in Risk Assessment?

Sammanfattning

Systemic neonicotinoid insecticides are increasingly used as a crop protection measure to suppress insect pests on trees. However, senescent foliage falling from treated trees represents a rarely studied pathway through which neonicotinoids may enter nontarget environments, e.g., surface waters. To estimate risk posed by this pathway, neonicotinoid residues were analyzed in foliage from black alder trees treated with one of three neonicotinoid insecticides (imidacloprid, thiacloprid, or acetamiprid) at five concentrations, each ranging from 0.0375-9.6 g active ingredient/cm trunk diameter at breast height (n = 3). Foliar residues measured at the time of leaf fall were used as input parameters for a model predicting imidacloprid water concentrations over a 100-m-long stream stretch as a consequence of remobilization from introduced foliage (input: 600 g foliage/m(2) containing 80 mu g imidacloprid/g). The water concentration (up to,similar to 250 mu g/L) predicted by the model exceeded the recently proposed Maximum Permissible Concentration of 8.3 mu g/L for 15.5 days. Moreover, dietary uptake was identified as an additional exposure route for aquatic organisms. The alternative pathway (i.e., introduction via leaf fall) and exposure route (i.e., dietary uptake) associated with the systemic nature of neonicotinoids should be accounted for during their registration process in order to safeguard ecosystem integrity.

Publicerad i

Environmental Science and Technology
2017, volym: 51, nummer: 3, sidor: 1785-1794

SLU författare

• Bundschuh, Mirco

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

Associerade SLU-program

SLU Nätverk växtskydd

Globala målen (SDG)

SDG3 God hälsa och välbefinnande
SDG6 Rent vatten och sanitet för alla

UKÄ forskningsämne

Annan naturvetenskap

Publikationens identifierare

• DOI: https://doi.org/10.1021/acs.est.6b05213

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/86675