The effects on birds of certain chlorinated insecticides used as seed dressings.

In England during the spring, commencing in the year 1956, numbers of deaths occurred amongst wild birds and the insecticides used to dress cereal seeds were suspected. Pigeons were fed with dieldrin, aldrin, heptachlor and y-BHC and the toxicities and residues in flesh and organs measured. Following this, birds from the field were examined during the 1960/61 sowing season. The results of analyses support the view that dieldrin, aldrin and heptachlor had been mainly responsible for the deaths. An ecological section includes an explanation for the predominance of casualties in the spring time.

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