- Kingsbury, P.D.
Forest Pest Management Institute
Extensive studies were carried out in a lake and a number of streams treated with two 0.280 kg/ha applications of fenitrothion followed by a 0.070 kg/ha applications of fenitrothion followed by a 0.070 kg/ha aminocarb treatment applied for spruce budworm, Choristoneura fumiferana Clemens, control. No dramatic adverse effects on lake zooplankton, benthos or fish populations occurred but a significant effect on shallow dwelling baetid mayfly nymphs was indicated. Effects in streams were minimal and were far less than those caused by severe spate conditions. Short lived increases in drift and opportunistic feeding by brook trout, Salvalinus fontinalis Mitchell, were documented, but no significant depletion of bottom fauna was found.