Hooper, Frank F,, John E, Williams, Mercer H, 
Patriarche, Fred Kent, and James C, Schneider, 
1964, Status of lake and stream rehabilitation in 
the United States and Canada with recommenda- 
tions for Michigan waters, Contrib, from 
Dingell-Johnson Proj, F-27-R-2, Inst, for Fish- 
eries Res,, Mich, Dept, Conserv,, Rpt, 1688, 
Pe 1-56, 
Jackson, C, F, 
1956, Control of common sunfish or pumpkinseed, 
Lepomis gibbosus in New Hampshire, N,H, Fish 
and Game Dept, Tech, Cir. 12, p, 1-16, 
Lennon, Robert E,, and Charles R, Walker, 
1964, Investigations in fish control, 1, Labora- 
tories and methods for screening fish-control 
chemicals, U.S, Bur, Sport Fisheries and Wild- 
life, Bur, Cir, 185, p, 1-15, 
Leonard, Justin W. 
1939, Notes on the use of derris as a fish poison, 
Amer, Fisheries Soc, Trans, 68 (1938), p. 269- 
280, 
MacPhee, Craig, 
1963, The determination and development of sperm 
toxins for the control of undesirable species of 
fish, Mimeo: Operational Studies Contract 
221.2, U.S, Bur, Com, Fisheries, p, 1-14. 
Miller, Richard B, 
1950, A critique of the need and use of poisons in 
fisheries research and management, Canad, Fish 
Cult, 8, p, 30-33, 
Prevost, Gustave, 
1960, Use of fish toxicants in the Province of 
Quebec, Canad, Fish Cult, 28, 13 p, 
Smith, M, W. 
1950, The use of poisons to control undesirable 
fish in Canadian fresh waters, Canad, Fish Cult, 
8, p. 17-29, 
Solman, V, E, F. 
1950, History and use of fish poisons in the United 
States, Canad, Fish Cult, 8, p, 3-16, 
Sreenivasan, A,, and M, V, Natarajan, 
1962, Use of endrin in fishery management, U.S, 
Bur, Sport Fisheries and Wildlife, Prog, Fish 
Cult, 24 (4), 181 p. 
Tang, Yun-An, 
1961, The use of saponin to control predaceous 
fishes in shrimp ponds, U.S, Bur, Sport Fish- 
eries and Wildlife, Prog, Fish Cult, 23 (1), p. 
43-45, 
Titcomb, John W, 
1914, The use of copper sulfate for the destruc- 
tion of obnoxious fishes in ponds and lakes, 
Amer, Fisheries Soc, Trans, 44, p, 20-24, 
Walker, Charles R,, Robert E, Lennon, and Bernard L, 
Berger, 
1964, Investigations in fish control, 2, Prelimi- 
nary observations on the toxicity of antimycin A 
to fish and other aquatic animals, U.S, Bur. 
Sport Fisheries and Wildlife, Bur, Cir. 186, 
pe 1-18, 
Westfall, Bertis A,, Robert L, Russell, and Theodore K, 
Auyong, 
1961, Depressant agent from walnut hulls, Science 
134 (3490), 1617 p, 
Young, Stanley P,, and E, A, Goldman, 
1944, The wolves of North America, Pt, I, Their 
history, life habits, economic status, and con- 
trol, Amer, Wildlife Inst,, Washington, D.C., 
385 + XVI p, 
THE FUTURE ROLE OF NATURAL AND SYNTHETIC ATTRACTANTS 
FOR PEST CONTROL 
Morton Beroza, Research Chemist, Entomology Research Division, Agricultural Research 
Service, U.S. Department of Agriculture, Beltsville, Md. 
Whether we agree with the late Rachel 
Carson or not, it is clear that this talented 
author found a weak point in our scientific 
armament and she dramatized the need in 
"Silent Spring'' for research in the vital area 
of pesticides (1). 
This statement is not meant to imply that 
our chemists, entomologists, public-health 
officials, and others responsible for synthe- 
sizing, testing, advocating, selling, or con- 
doning the use of pesticides are at fault. On 
the contrary, these workers have put to ex- 
cellent use our expanding knowledge of 
34 
chemistry and biology. Their chemicals and 
techniques of employing chemicals have saved 
millions of lives. These efforts have been so 
effective that we have to cope with such im- 
mediate problems as what to do with our 
food surpluses and such long-term problems 
as the human population explosion. 
Evolutionary processes being slow, who 
would have predicted that insects would have 
built up an immunity to our wonder chemicals 
in less than a decade? Species of insects 
resistant to insecticides can now be counted 
in the hundreds (2), and this problem is one 
