100 

 80 



D4TE OF 

 pSPRAYING 



Mm 



,i, r|r|^ , 



■ ,'f ^f< , rp[1 



5 10 15 20 25 

 JUNE 



4Mi 



1 9S ' ^ in m 9n 



5 10 15 20 25 ' 5 10 15 20 25 

 JULY AUGUST 



DATE OF SAMPLE 



5 10 15 20 

 SEPTEMBER 



Ddiptera 



■ ephemeroptera 



■ 100 



eo 



60 

 40 



^ , \[ ^ , ^ , ^^ , ^^^ , ^ , , 



10 15 20 25 I 5 10 15 20 25 ' 5 10 15 20 



5 10 15 20 25 I 5 10 15 20 25 I 5 10 15 20 25 I 5 10 15 20 

 JUNE JULY AUGUST SEPTEMBER 



DATE OF SAMPLE 



Figure 2. — Average number of Diptera and Ephemeroptera 

 per test stone from weekly samples of 40 stones, 1961- 

 64, Old Tom Creek (control stream). 



Figure 4. — Average number of Diptera and Ephemeroptera 

 per test stone from weekly samples of 40 stones, 1961- 

 64, Saltery Cove Creek (control stream). 



-1 — I — I — I — I — I '|~ I ' T ' r' r I — I — I — I — I — r 



5 10 15 20 25 ' 5 10 15 20 25 ' 5 10 15 20 25 ' 5 10 15 20 



JULY AUGUST 



DATE OF SAMPLE 



SEPTEMBER 



Figure 3. — Average number of Diptera and Ephemeroptera 

 per test stone from weekly samples of 40 stones, 1961- 

 64, Cabin Creek (test stream). 



80 - 

 60 

 40 

 20 



I 100 

 . 80 

 I 60 



i 40 



.^^ 



4UU 



Ddiptera 

 ■ephemeroptera 



o :NONE 



• =LESS THAN ONE 



r^ f^ , r> r^ , n ij np f[^ , r^ - 



M 



-DATE OF SPRAYING 



oo op oo 



o* o* o* 



oo^ 



g 60|- 1964 

 40 

 20 



I 1 ^ 1 T r' 



5 10 15 20 25 



JUNE 



i - i v'l'^ ^ ? -i rH r>r^ 



10 15 20 25 ' 5 10 15 20 25 

 JULY AUGUST 



DATE OF SAMPLE 



5 10 15 20 

 SEPTEMBER 



Figure 5. — Average number of Diptera and Ephemeroptera 

 per test stone from weekly samples of 40 stones, 1961- 

 64, Virginia Creek (test stream). 



