TABLE 2. ACUTE TOXICITY 1 (96-h LC50 AND 95% CONFIDENCE INTERVALS, mg/1 ) 



OF SIX CANDIDATE FOREST INSECTICIDES TO MATURE SCUDS AND 



STONEFLY NAIADS TESTED AT 18 °C and 16 °C 



Invertebrate and Test Temperature 



Compound Scud Stonefly 

 (% active 



ingredient) 18 °C 16 °C 



Sumithion >0.01 0.004 



(95%) 0.002-0.006 



Matacil 0.012 



(98%) 0.008-0.018 



Dylox 0.040 0.035 



(99%) 0.026-0.060 0.022-0.055 



Carbaryl 0.016 0.002 



(99.5%) 0.012-0.019 0.001-0.003 



Orthene >100 

 (94%) 



Dimilin 0.030 



(25%) 0.020-0.050 



Toxicity based on active ingredient in static tests. 



All chemicals tested were technical grade material except the field 

 formulation of Dimilin. 



20 



