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0LY AUGUST aerial application Amer application of DDT aquatic insects Aroostook County Aufu/uc/is average square root black ﬂies black ﬂy larvae black fly population blocking nets BR0K brook trout caddisﬂies CADDISFLY caddisﬂy population Caniba Brook cent by number chironomid COLLECTION DATA control stream populations Daigle Brook DDT spraying drain tube effects of DDT Effects of forest Entomology experimental streams ﬁeld ﬁgures ﬁrst ﬁsh forest spraying increase larvae larviciding late Iuly late Iune LITTLE GODDARD BROOK Maine Forest Service mayflies mid-Iune midge population midges and black number of insects Ohio State University plankton Plecoptera population curves population trends post-spray potential trout food pound of DDT present study Rainbow trout recovery riffle insects salmon signiﬁcant SIMULIIDAE spray application spray area spray-deposit cards sprayed brooks sprayed streams spruce budworm square foot stoneﬂies stream-bottom insects streams in 1958 Surber sampler TABLE Trans trout stream unsprayed volumometer Wildl wildlife