The effects of tricyclazole treatments on benthic macroinvertebrates
in the field and in laboratory were studied. In field conditions, low density
of benthic populations was observed, both in treated and untreated
plots, which was attributed to the short period of submersion of the
rice field and high water temperature, fungicide treatments had no
significant effect. Both laboratory acute toxicity test and a test using a
mesocosm suggested a low toxicity of tricyclazole on invertebrates. A
reduction of the macroinvertebrate density was observed only when
tricyclazole concentration was applied at concentrations 100 times the
ones tested in the field, acute toxicity test gave an LC50 after 48 h of 26
mg*L\u20131, in agreement with data obtained for other species
