Carbaryl, Carbofuran, and Methomyl - National Marine Fisheries ...

Jardine, MacLatchy et al. 2005; Luo, Ban et al. 2005; McCormick, O'Dea et al. 2005; Lerner,
Bjornsson et al. 2007; Lerner, Bjornsson et al. 2007).
These results demonstrate NP is of concern to aquatic life, particularly salmonid endocrine
systems involved in reproduction and smoltification. This summary is for one of the more than
4,000 inerts/other ingredients and adjuvants currently registered for use in pesticide formulations
and there are likely others with equally deleterious effects. Unfortunately we received minimal
information on the constituents found in carbaryl-, carbofuran-, and methomyl-containing
formulations. Consequently, the effects that these other ingredients may have on listed salmonids
and designated critical habitat remain an uncertainty and are a recognized data gap in EPA’s
action under this consultation.
Summary of Response Analysis:
We summarize the available toxicity information by assessment endpoint in Table 66. Data and
information reviewed for each assessment endpoint was assigned a general qualitative ranking of
either “low”, “medium”, or “high.” To achieve a high confidence ranking, the information
stemmed from direct measurements of an assessment endpoint, conducted with a listed species or
appropriate surrogate, and was from a well-conducted experiment with stressors of the action or
relevant chemical surrogates. A medium ranking was assigned if one of these three general
criteria was absent and low ranking was assigned if two criteria were absent. Evidence of
adverse effects to assessment endpoints for salmonids and their habitat from the three a.i.s was
prevalent. However, much less information was available for other ingredients, in part, due to
the lack of formulation information provided in the BEs as well as the statutory mandate under
FIFRA for toxicity data on the a.i.s to support registration. We did locate a substantial amount of
data on one group of adjuvants/surfactants, the NP ethoxylates. However, we received and
located minimal information for the majority of tank mixes and other ingredients within
formulations.
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