Signal Words DANGER Danger"reflects the highest degree of relative toxicity All pesticides with an LDso of less than 50 mg/kg must display this word on their label Pesticides here are classed as“highly toxic"” Mistretta USFS R-8Signal Words DANGER “Danger” reflects the highest degree of relative toxicity All pesticides with an LD50 of less than 50 mg/kg must display this word on their label Pesticides here are classed as “highly toxic” Mistretta USFS R-8