Experiments in Ontario by the Dept. of Lands and Forests show what happens when DDT is used out of doors. Damage to trees was limiated to burning of leaf edges. Carnivorous water beetles and some other aquatic animals were not greatly affected but died because the insects on which they fed were destroyed. Other aquatic insects were killed directly. Crayfish, which feed on insects and themselves serve as fish food, were very susceptible. Minnows were killed by contact and trout died from eathing poisoned insects. Six kinds of frogs and two kinds of snakes were killed, either by contact or by eating poisoned insects. Any DDT field spray is likely to destroy more than half of these amphibians. (page 72)
There is an interesting reference to a case of several human deaths due to DDT — these reports of human deaths disappeared from research reports rather quickly, and today critics of environmental protection policies often say that no human ever died from DDT. What happened to those reports, and are there others?
A further objection to the wide use of DDT in larvae control is the dangers of contaminating the water supply. Fear of this led us to abandon plans to use DDT extensively at Bear Mountain Park. Heavy rains might wash the DDT into reservoirs. We were not fully aware of the deadly effects of the chmical then, but we received word from Okinawa later than several natives had died from eating DDT, and post-morten examination revealed nerve lesions similar to those produced by strychnine. (p. 72)
Brownfielders working against Rachel Carson sometimes claim she manufactured controversy about DDT with the publication of her book in 1962. Go see this article from 16 years earlier, and see the warnings offered by the author, Dr. C. H. Curran, who was Associate Curator, Department of Insects and Spiders, at the American Museum of Natural History.
Rachel was right, and still is.
- Also see “The Deadly Dust: The unhappy history of DDT,” Kenneth S. Davis, American Heritage, Vol. 22, Issue 2, February 1971
- Also see “The Short-Lived Miracle of DDT,” Darwin H. Stapleton, Invention and Technology Magazine, Winter 2000 Volume 15, Issue 3
- Also see “‘God Bless General Pero´n': DDT and the Endgame of Malaria Eradication in Argentina in the 1940s,” Eric D. Carter, Journal of the History of Medicine and Allied Sciences, September 2008 doi:10.1093/jhmas/jrn057