- Bean, James L.
Two different application rates of Sumithion 8E was aerially applied to a series of spruce-fir plots in northern Maine to obtain additional environmental impact data. The data from this test will be used in support of federal registration for the use of Sumithion 8E for control of the eastern spruce budworm. Due to the late date (June 23rd) that this test was carried out no data on larval mortality was obtained. The application rates tested were: (a) 3 oz. AI of Sumithion 8E in 29 oz. of water applied once at the rate of 32 oz. per acre; and (b) two applications of 2 oz. AI of Sumithion 8E in 30 oz. of water applied at the rate of 32 oz. per acre.
First applications of both the 3 oz. per acre and the 2 oz. AI per acre \Mere made on June 23rd. The second. application of the 2 oz. AI per acre formulation was made on JuIy 5th. Bad. weather delayed the second application by 5 days.
There was no evidence that Sumithion 8E had any harmful effects on singing male birds nor on those that v/ere still nesting.
Only the 2 applications of 2 oz. AI per acre application rate was evaluated for the effects on non-target stream insects. Field data indicated that there was no accumulations of dead organisms on the substrate and no unusual increase in the amount of drift immediately after spraying.